ASP.NET 运行机制

原本今天打算继续写ASP.NET MVC第四天的。但是由于里面涉及到asp.net运行机制的原理，如果不分析一下这里，mvc想说清楚还是挺困难的。既然要提到asp.net运行机制，所以打算还是说详细一点的好。记录mvc第一天的时候就说过，asp.net mvc也是基于asp.net运行机制的（也就是原理）。网上也有很多讲解asp.net运行机制的，我在这里说一下自己的认识，我们开始吧。

我们从web程序的入口开始。那就要先说到iis了，大家都知道，这是web服务软件。将web程序部署到iis过的人都知道，如果不做任何处理，我们写的webform是不能运行的。为什么非要执行aspnet_regiis才可以呢？我们看一下电脑路径C:WindowsMicrosoft.NETFrameworkv4.0.30319，aspnet_regiis.exe就在这里路径下。我们简单说一下原因，看下iis的历史，在百度上没有查到iis软件发布的年限，但至少iis在windows 2000的时候就存在了，而我们的.net framework在2002-02-13的时候才发布1.0版本，是啊，我们都知道微软很厉害，但就是在厉害他也不会强大到可以预测几年后的软件运行机制吧。也就是说iis对.net framework还说就是个“古董”,他不可能会知道.net framewrok运行机制，更不可能知道asp.net的运行机制。早起的iis也只能处理静态页面，也就类似于html，js，图片之类的东西。但现在如果我们想将asp.net 程序部署到iis上怎么办呢？对，扩展，使用扩展程序，我们运行aspnet_regiis.exe也就是将扩展程序（aspnet_isapi）注入到iis中，这样iis就可以处理了？---------哈哈，iis还是处理处理不了asp.net程序，但是后注入的程序可以告诉iis，我扩展程序可以处理什么样的程序，你如果处理不了，可以尝试交给我处理。

看一下上面说到的路经下面有个aspnet_isapi.dll，我们只是简单的说一下这里，这个dll是使用c/c++写的，并不是c#写的，所以我们无法反编译成c#代码。这是个承上启下的动态库，因为c/c++并不是我们考虑的范围内，我们直接认为这个程序将请求交给我们“在乎”的程序，下面我们开始反编译我们“在乎”程序。反编译工具中查找ISAPIRuntime这个类，下面是我反编译出来的结果这个类是system.web程序集下的类

 1 public sealed class ISAPIRuntime : MarshalByRefObject, IISAPIRuntime, IISAPIRuntime2, IRegisteredObject
 2 {
 3     // Fields
 4     private static int _isThisAppDomainRemovedFromUnmanagedTable;
 5     private const int WORKER_REQUEST_TYPE_IN_PROC = 0;
 6     private const int WORKER_REQUEST_TYPE_IN_PROC_VERSION_2 = 2;
 7     private const int WORKER_REQUEST_TYPE_OOP = 1;
 8 
 9     // Methods
10     [SecurityPermission(SecurityAction.Demand, Unrestricted=true)]
11     public ISAPIRuntime();
12     [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
13     public void DoGCCollect();
14     public override object InitializeLifetimeService();
15     [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
16     public int ProcessRequest(IntPtr ecb, int iWRType);
17     internal static void RemoveThisAppDomainFromUnmanagedTable();
18     [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
19     public void StartProcessing();
20     [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
21     public void StopProcessing();
22     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
23     void IISAPIRuntime2.DoGCCollect();
24     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
25     int IISAPIRuntime2.ProcessRequest(IntPtr ecb, int iWRType);
26     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
27     void IISAPIRuntime2.StartProcessing();
28     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
29     void IISAPIRuntime2.StopProcessing();
30     void IRegisteredObject.Stop(bool immediate);
31 }
32 
33  
34 Expand Methods
35

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其实我贴出代码没有别的意思，就是想用事实说话，过多的内容我们不看，我们只看里面的public int ProcessRequest(IntPtr ecb, int iWRType)处理请求方法。我们先看一下参数类型吧，IntPtr？有调c/c++动态库的人会知道这是c/c++里面指针类型，我们不用过多的考虑。我自己分析的，不知道对不对，正因为这是IntPtr，所以该类应该是调用了c/c++相关的动态库了，不然这里也没有必要用到。这样流程就出来了，IIS——》aspnet_isapi（c/c++相关动态库）——》ISAPIRuntime类；需要提到一点的是，IntPtr是个指针，指针会指向一块内存区域，可能很大，也可能很小。我认为请求的内容放在了这块区域中，从这里面可以获取到浏览器请求头的内容下面是ProcessRequest方法的内容

 1 [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
 2 public int ProcessRequest(IntPtr ecb, int iWRType)
 3 {
 4     IntPtr zero = IntPtr.Zero;
 5     if (iWRType == 2)
 6     {
 7         zero = ecb;
 8         ecb = UnsafeNativeMethods.GetEcb(zero);
 9     }
10     ISAPIWorkerRequest wr = null;
11     try
12     {
13         bool useOOP = iWRType == 1;
14         wr = ISAPIWorkerRequest.CreateWorkerRequest(ecb, useOOP);
15         wr.Initialize();
16         string appPathTranslated = wr.GetAppPathTranslated();
17         string appDomainAppPathInternal = HttpRuntime.AppDomainAppPathInternal;
18         if ((appDomainAppPathInternal == null) || StringUtil.EqualsIgnoreCase(appPathTranslated, appDomainAppPathInternal))
19         {
20             HttpRuntime.ProcessRequestNoDemand(wr);
21             return 0;
22         }
23         HttpRuntime.ShutdownAppDomain(ApplicationShutdownReason.PhysicalApplicationPathChanged, SR.GetString("Hosting_Phys_Path_Changed", new object[] { appDomainAppPathInternal, appPathTranslated }));
24         return 1;
25     }
26     catch (Exception exception)
27     {
28         try
29         {
30             WebBaseEvent.RaiseRuntimeError(exception, this);
31         }
32         catch
33         {
34         }
35         if ((wr == null) || !(wr.Ecb == IntPtr.Zero))
36         {
37             throw;
38         }
39         if (zero != IntPtr.Zero)
40         {
41             UnsafeNativeMethods.SetDoneWithSessionCalled(zero);
42         }
43         if (exception is ThreadAbortException)
44         {
45             Thread.ResetAbort();
46         }
47         return 0;
48     }
49 }
50 
51  
52 
53

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下面我们来分析一下这里面的代码，我们只分析重要的部分。

这里新建了一个 ISAPIWorkerRequest wr = null;类，进行创建封装该对象，wr = ISAPIWorkerRequest.CreateWorkerRequest(ecb, useOOP);上面说了ecb是个指针，里面可以存储很多请求内容的。紧接着对wr进行初始化wr.Initialize();我们着重看HttpRuntime.ProcessRequestNoDemand(wr);注意这里使用的是HttpRuntime，一会我们还会分析该类，现在我们进入ProcessRequestNoDemand方法里面看看。这里面应该是关于多线程模型了

 1 internal static void ProcessRequestNoDemand(HttpWorkerRequest wr)
 2 {
 3     RequestQueue queue = _theRuntime._requestQueue;
 4     wr.UpdateInitialCounters();
 5     if (queue != null)
 6     {
 7         wr = queue.GetRequestToExecute(wr);
 8     }
 9     if (wr != null)
10     {
11         CalculateWaitTimeAndUpdatePerfCounter(wr);
12         wr.ResetStartTime();
13         ProcessRequestNow(wr);
14     }
15 }
16 
17  
18 
19

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这时ISAPIRuntime已经将请求交给HttpRuntime类了，HttpRuntime类调用RequestQueue queue = _theRuntime._requestQueue;该类试图获取请求处理队列，我们可以简单的认为服务器在求情一个线程来处理该次浏览器的请求。wr = queue.GetRequestToExecute(wr);我们进入到GetRequestToExecute方法，

 1 internal HttpWorkerRequest GetRequestToExecute(HttpWorkerRequest wr)
 2 {
 3     int num;
 4     int num2;
 5     int num3;
 6     ThreadPool.GetAvailableThreads(out num, out num2);
 7     if (this._iis6)
 8     {
 9         num3 = num;
10     }
11     else
12     {
13         num3 = (num2 > num) ? num : num2;
14     }
15     if ((num3 < this._minExternFreeThreads) || (this._count != 0))
16     {
17         bool isLocal = IsLocal(wr);
18         if ((isLocal && (num3 >= this._minLocalFreeThreads)) && (this._count == 0))
19         {
20             return wr;
21         }
22         if (this._count >= this._queueLimit)
23         {
24             HttpRuntime.RejectRequestNow(wr, false);
25             return null;
26         }
27         this.QueueRequest(wr, isLocal);
28         if (num3 >= this._minExternFreeThreads)
29         {
30             wr = this.DequeueRequest(false);
31             return wr;
32         }
33         if (num3 >= this._minLocalFreeThreads)
34         {
35             wr = this.DequeueRequest(true);
36             return wr;
37         }
38         wr = null;
39         this.ScheduleMoreWorkIfNeeded();
40     }
41     return wr;
42 }
43 
44  
45 
46

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当然服务器不可能只有一个求情，如果同时有多个用户请求，这时队列中就可能没有线程可响应此次请求，在这里面就会调用this.ScheduleMoreWorkIfNeeded();从线程池中拿出一个来处理请求。下面我们返回ProcessRequestNoDemand（）方法，该方法调用了ProcessRequestNow(wr);处理请求。

1 internal static void ProcessRequestNow(HttpWorkerRequest wr)
2 {
3     _theRuntime.ProcessRequestInternal(wr);
4 }
5 
6

View Code

我们只看ProcessRequestNow（）方法

这个方法又调用了HttpRuntime的ProcessRequestInternal方法，接下来我们开始分析HttpRuntme类，

  1 public sealed class HttpRuntime
  2 {
  3     // Fields
  4     private int _activeRequestCount;
  5     private bool _apartmentThreading;
  6     private string _appDomainAppId;
  7     private string _appDomainAppPath;
  8     private VirtualPath _appDomainAppVPath;
  9     private string _appDomainId;
 10     private Timer _appDomainShutdownTimer;
 11     private WaitCallback _appDomainUnloadallback;
 12     private byte[] _appOfflineMessage;
 13     private HttpWorkerRequest.EndOfSendNotification _asyncEndOfSendCallback;
 14     private bool _beforeFirstRequest;
 15     private CacheInternal _cacheInternal;
 16     private Cache _cachePublic;
 17     private string _clientScriptPhysicalPath;
 18     private string _clientScriptVirtualPath;
 19     private string _codegenDir;
 20     private bool _configInited;
 21     private bool _debuggingEnabled;
 22     private static string _DefaultPhysicalPathOnMapPathFailure;
 23     private bool _disableProcessRequestInApplicationTrust;
 24     private volatile bool _disposingHttpRuntime;
 25     private bool _enableHeaderChecking;
 26     private static bool _enablePrefetchOptimization;
 27     private FileChangesMonitor _fcm;
 28     private bool _firstRequestCompleted;
 29     private DateTime _firstRequestStartTime;
 30     private bool _fusionInited;
 31     private AsyncCallback _handlerCompletionCallback;
 32     private bool _hostingInitFailed;
 33     private string _hostSecurityPolicyResolverType;
 34     private static Version _iisVersion;
 35     private Exception _initializationError;
 36     private bool _isLegacyCas;
 37     private bool _isOnUNCShare;
 38     private DateTime _lastShutdownAttemptTime;
 39     private NamedPermissionSet _namedPermissionSet;
 40     private PolicyLevel _policyLevel;
 41     private bool _processRequestInApplicationTrust;
 42     private Profiler _profiler;
 43     private AsyncCallback _requestNotificationCompletionCallback;
 44     private RequestQueue _requestQueue;
 45     private bool _shutdownInProgress;
 46     private string _shutDownMessage;
 47     private ApplicationShutdownReason _shutdownReason;
 48     private string _shutDownStack;
 49     private bool _shutdownWebEventRaised;
 50     private string _tempDir;
 51     private static HttpRuntime _theRuntime;
 52     private RequestTimeoutManager _timeoutManager;
 53     private string _trustLevel;
 54     private static bool _useIntegratedPipeline;
 55     private bool _userForcedShutdown;
 56     private string _wpUserId;
 57     private static BuildManagerHostUnloadEventHandler AppDomainShutdown;
 58     private const string AppOfflineFileName = "App_Offline.htm";
 59     private const string AspNetClientFilesParentVirtualPath = "/aspnet_client/system_web/";
 60     private const string AspNetClientFilesSubDirectory = "asp.netclientfiles";
 61     internal const string BinDirectoryName = "bin";
 62     internal const string BrowsersDirectoryName = "App_Browsers";
 63     internal const string CodeDirectoryName = "App_Code";
 64     internal const string codegenDirName = "Temporary ASP.NET Files";
 65     internal const string DataDirectoryName = "App_Data";
 66     private static string DirectorySeparatorString;
 67     private static string DoubleDirectorySeparatorString;
 68     internal const string GlobalThemesDirectoryName = "Themes";
 69     internal const string LocalResourcesDirectoryName = "App_LocalResources";
 70     private const long MaxAppOfflineFileLength = 0x100000L;
 71     internal const string profileFileName = "profileoptimization.prof";
 72     internal const string ResourcesDirectoryName = "App_GlobalResources";
 73     internal static byte[] s_autogenKeys;
 74     private static Hashtable s_factoryCache;
 75     private static FactoryGenerator s_factoryGenerator;
 76     private static object s_factoryLock;
 77     private static bool s_initialized;
 78     private static bool s_initializedFactory;
 79     private static string s_installDirectory;
 80     private static char[] s_InvalidPhysicalPathChars;
 81     private static bool s_isEngineLoaded;
 82     internal const string ThemesDirectoryName = "App_Themes";
 83     internal const string WebRefDirectoryName = "App_WebReferences";
 84 
 85     // Events
 86     internal static  event BuildManagerHostUnloadEventHandler AppDomainShutdown;
 87 
 88     // Methods
 89     static HttpRuntime();
 90     [SecurityPermission(SecurityAction.LinkDemand, Unrestricted=true)]
 91     public HttpRuntime();
 92     internal static void AddAppDomainTraceMessage(string message);
 93     private void AppDomainShutdownTimerCallback(object state);
 94     private static void CalculateWaitTimeAndUpdatePerfCounter(HttpWorkerRequest wr);
 95     [FileIOPermission(SecurityAction.Assert, Unrestricted=true)]
 96     private void CheckAccessToTempDirectory();
 97     internal static void CheckApplicationEnabled();
 98     internal static void CheckAspNetHostingPermission(AspNetHostingPermissionLevel level, string errorMessageId);
 99     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
100     internal static void CheckFilePermission(string path);
101     internal static void CheckFilePermission(string path, bool writePermissions);
102     internal static void CheckVirtualFilePermission(string virtualPath);
103     [SecurityPermission(SecurityAction.Demand, Unrestricted=true)]
104     public static void Close();
105     internal static void CoalesceNotifications();
106     private void CreateCache();
107     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
108     internal static object CreateNonPublicInstance(Type type);
109     [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
110     internal static object CreateNonPublicInstance(Type type, object[] args);
111     private static PolicyLevel CreatePolicyLevel(string configFile, string appDir, string binDir, string strOriginUrl, out bool foundGacToken);
112     internal static object CreatePublicInstance(Type type);
113     internal static object CreatePublicInstance(Type type, object[] args);
114     internal static void DecrementActivePipelineCount();
115     private void Dispose();
116     private void DisposeAppDomainShutdownTimer();
117     private void EndOfSendCallback(HttpWorkerRequest wr, object arg);
118     private void EnsureAccessToApplicationDirectory();
119     private void EnsureFirstRequestInit(HttpContext context);
120     internal static void FailIfNoAPTCABit(Type t, XmlNode node);
121     internal static void FailIfNoAPTCABit(Type t, ElementInformation elemInfo, string propertyName);
122     internal static object FastCreatePublicInstance(Type type);
123     internal static void FinishPipelineRequest(HttpContext context);
124     private void FinishRequest(HttpWorkerRequest wr, HttpContext context, Exception e);
125     private void FinishRequestNotification(IIS7WorkerRequest wr, HttpContext context, ref RequestNotificationStatus status);
126     private void FirstRequestInit(HttpContext context);
127     internal static void ForceStaticInit();
128     private static string GetAppDomainString(string key);
129     internal static CacheInternal GetCacheInternal(bool createIfDoesNotExist);
130     private static string GetCurrentUserName();
131     internal static string GetGacLocation();
132     private void GetInitConfigSections(out CacheSection cacheSection, out TrustSection trustSection, out SecurityPolicySection securityPolicySection, out CompilationSection compilationSection, out HostingEnvironmentSection hostingEnvironmentSection, out Exception initException);
133     [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Unrestricted)]
134     public static NamedPermissionSet GetNamedPermissionSet();
135     internal static string GetRelaxedMapPathResult(string originalResult);
136     internal static string GetSafePath(string path);
137     internal static bool HasAppPathDiscoveryPermission();
138     private static bool HasAPTCABit(Assembly assembly);
139     internal static bool HasAspNetHostingPermission(AspNetHostingPermissionLevel level);
140     internal static bool HasDbPermission(DbProviderFactory factory);
141     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
142     internal static bool HasFilePermission(string path);
143     internal static bool HasFilePermission(string path, bool writePermissions);
144     internal static bool HasPathDiscoveryPermission(string path);
145     internal static bool HasUnmanagedPermission();
146     internal static bool HasWebPermission(Uri uri);
147     private void HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException);
148     internal static void IncrementActivePipelineCount();
149     private void Init();
150     private void InitApartmentThreading();
151     private void InitDebuggingSupport();
152     private void InitFusion(HostingEnvironmentSection hostingEnvironmentSection);
153     private void InitHeaderEncoding();
154     private static void InitHttpConfiguration();
155     private void InitializeHealthMonitoring();
156     internal static void InitializeHostingFeatures(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException);
157     private bool InitiateShutdownOnce();
158     private void InitRequestQueue();
159     private void InitTrace(HttpContext context);
160     internal static bool IsPathWithinAppRoot(string path);
161     internal static bool IsTypeAccessibleFromPartialTrust(Type t);
162     internal static bool IsTypeAllowedInConfig(Type t);
163     internal static string MakeFileUrl(string path);
164     internal static void OnAppDomainShutdown(BuildManagerHostUnloadEventArgs e);
165     private void OnAppOfflineFileChange(object sender, FileChangeEvent e);
166     internal static void OnConfigChange(string message);
167     private void OnCriticalDirectoryChange(object sender, FileChangeEvent e);
168     private void OnHandlerCompletion(IAsyncResult ar);
169     private void OnRequestNotificationCompletion(IAsyncResult ar);
170     private void OnRequestNotificationCompletionHelper(IAsyncResult ar);
171     private void OnSecurityPolicyFileChange(object sender, FileChangeEvent e);
172     internal static void PopulateIISVersionInformation();
173     [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
174     private void PreloadAssembliesFromBin();
175     private void PreloadAssembliesFromBinRecursive(DirectoryInfo dirInfo);
176     [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Medium)]
177     public static void ProcessRequest(HttpWorkerRequest wr);
178     private void ProcessRequestInternal(HttpWorkerRequest wr);
179     internal static void ProcessRequestNoDemand(HttpWorkerRequest wr);
180     internal static RequestNotificationStatus ProcessRequestNotification(IIS7WorkerRequest wr, HttpContext context);
181     private RequestNotificationStatus ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context);
182     internal static void ProcessRequestNow(HttpWorkerRequest wr);
183     private void RaiseShutdownWebEventOnce();
184     internal static void RecoverFromUnexceptedAppDomainUnload();
185     private void RejectRequestInternal(HttpWorkerRequest wr, bool silent);
186     internal static void RejectRequestNow(HttpWorkerRequest wr, bool silent);
187     private void RelaxMapPathIfRequired();
188     [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
189     private void ReleaseResourcesAndUnloadAppDomain(object state);
190     internal static void ReportAppOfflineErrorMessage(HttpResponse response, byte[] appOfflineMessage);
191     internal static void RestrictIISFolders(HttpContext context);
192     private void SetAutoConfigLimits(ProcessModelSection pmConfig);
193     private static void SetAutogenKeys();
194     [SecurityPermission(SecurityAction.Assert, ControlThread=true)]
195     internal static void SetCurrentThreadCultureWithAssert(CultureInfo cultureInfo);
196     private static void SetExecutionTimePerformanceCounter(HttpContext context);
197     internal static void SetShutdownMessage(string message);
198     internal static void SetShutdownReason(ApplicationShutdownReason reason, string message);
199     private void SetThreadPoolLimits();
200     private void SetTrustLevel(TrustSection trustSection, SecurityPolicySection securityPolicySection);
201     private void SetTrustParameters(TrustSection trustSection, SecurityPolicySection securityPolicySection, PolicyLevel policyLevel);
202     private void SetUpCodegenDirectory(CompilationSection compilationSection);
203     private void SetUpDataDirectory();
204     internal static void SetUserForcedShutdown();
205     private static bool ShutdownAppDomain(string stackTrace);
206     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
207     internal static bool ShutdownAppDomain(ApplicationShutdownReason reason, string message);
208     internal static bool ShutdownAppDomainWithStackTrace(ApplicationShutdownReason reason, string message, string stackTrace);
209     private void StartAppDomainShutdownTimer();
210     internal static void StartListeningToLocalResourcesDirectory(VirtualPath virtualDir);
211     private void StartMonitoringDirectoryRenamesAndBinDirectory();
212     private static void StaticInit();
213     public static void UnloadAppDomain();
214     private static void UpdatePerfCounters(int statusCode);
215     private void WaitForRequestsToFinish(int waitTimeoutMs);
216 
217     // Properties
218     internal static bool ApartmentThreading { get; }
219     public static string AppDomainAppId { get; }
220     public static string AppDomainAppPath { get; }
221     internal static string AppDomainAppPathInternal { get; }
222     public static string AppDomainAppVirtualPath { get; }
223     internal static VirtualPath AppDomainAppVirtualPathObject { get; }
224     internal static string AppDomainAppVirtualPathString { get; }
225     public static string AppDomainId { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries"), AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.High)] get; }
226     internal static string AppDomainIdInternal { get; }
227     internal static byte[] AppOfflineMessage { get; }
228     public static string AspClientScriptPhysicalPath { get; }
229     internal static string AspClientScriptPhysicalPathInternal { get; }
230     public static string AspClientScriptVirtualPath { get; }
231     public static string AspInstallDirectory { get; }
232     internal static string AspInstallDirectoryInternal { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
233     public static string BinDirectory { get; }
234     internal static string BinDirectoryInternal { get; }
235     public static Cache Cache { get; }
236     internal static CacheInternal CacheInternal { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
237     public static string ClrInstallDirectory { get; }
238     internal static string ClrInstallDirectoryInternal { get; }
239     internal static VirtualPath CodeDirectoryVirtualPath { get; }
240     public static string CodegenDir { get; }
241     internal static string CodegenDirInternal { get; }
242     internal static bool ConfigInited { get; }
243     internal static bool DebuggingEnabled { get; }
244     internal static bool DisableProcessRequestInApplicationTrust { get; }
245     internal static bool EnableHeaderChecking { get; }
246     internal static bool EnablePrefetchOptimization { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
247     internal static FileChangesMonitor FileChangesMonitor { get; }
248     internal static bool FusionInited { get; }
249     internal static bool HostingInitFailed { get; }
250     internal static string HostSecurityPolicyResolverType { get; }
251     public static Version IISVersion { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
252     internal static Exception InitializationException { get; set; }
253     internal static bool IsAspNetAppDomain { get; }
254     internal static bool IsEngineLoaded { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
255     internal static bool IsFullTrust { get; }
256     internal static bool IsLegacyCas { get; }
257     internal static bool IsMapPathRelaxed { get; }
258     public static bool IsOnUNCShare { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries"), AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Low)] get; }
259     internal static bool IsOnUNCShareInternal { get; }
260     internal static bool IsTrustLevelInitialized { get; }
261     private DateTime LastShutdownAttemptTime { get; set; }
262     public static string MachineConfigurationDirectory { get; }
263     internal static string MachineConfigurationDirectoryInternal { get; }
264     internal static NamedPermissionSet NamedPermissionSet { get; }
265     internal static PolicyLevel PolicyLevel { get; }
266     internal static bool ProcessRequestInApplicationTrust { get; }
267     internal static Profiler Profile { get; }
268     internal static RequestTimeoutManager RequestTimeoutManager { get; }
269     internal static VirtualPath ResourcesDirectoryVirtualPath { get; }
270     internal static bool ShutdownInProgress { get; }
271     internal static ApplicationShutdownReason ShutdownReason { get; }
272     public static Version TargetFramework { get; }
273     internal static string TempDirInternal { get; }
274     internal static string TrustLevel { get; }
275     internal static bool UseIntegratedPipeline { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; }
276     public static bool UsingIntegratedPipeline { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
277     internal static VirtualPath WebRefDirectoryVirtualPath { get; }
278     internal static string WpUserId { get; }
279 }
280 
281  
282 Expand Methods
283

View Code

看ProcessRequestInternal（）方法

 1 private void ProcessRequestInternal(HttpWorkerRequest wr)
 2 {
 3     Interlocked.Increment(ref this._activeRequestCount);
 4     if (this._disposingHttpRuntime)
 5     {
 6         try
 7         {
 8             wr.SendStatus(0x1f7, "Server Too Busy");
 9             wr.SendKnownResponseHeader(12, "text/html; charset=utf-8");
10             byte[] bytes = Encoding.ASCII.GetBytes("<html><body>Server Too Busy</body></html>");
11             wr.SendResponseFromMemory(bytes, bytes.Length);
12             wr.FlushResponse(true);
13             wr.EndOfRequest();
14         }
15         finally
16         {
17             Interlocked.Decrement(ref this._activeRequestCount);
18         }
19     }
20     else
21     {
22         HttpContext context;
23         try
24         {
25             context = new HttpContext(wr, false);
26         }
27         catch
28         {
29             try
30             {
31                 wr.SendStatus(400, "Bad Request");
32                 wr.SendKnownResponseHeader(12, "text/html; charset=utf-8");
33                 byte[] data = Encoding.ASCII.GetBytes("<html><body>Bad Request</body></html>");
34                 wr.SendResponseFromMemory(data, data.Length);
35                 wr.FlushResponse(true);
36                 wr.EndOfRequest();
37                 return;
38             }
39             finally
40             {
41                 Interlocked.Decrement(ref this._activeRequestCount);
42             }
43         }
44         wr.SetEndOfSendNotification(this._asyncEndOfSendCallback, context);
45         HostingEnvironment.IncrementBusyCount();
46         try
47         {
48             try
49             {
50                 this.EnsureFirstRequestInit(context);
51             }
52             catch
53             {
54                 if (!context.Request.IsDebuggingRequest)
55                 {
56                     throw;
57                 }
58             }
59             context.Response.InitResponseWriter();
60             IHttpHandler applicationInstance = HttpApplicationFactory.GetApplicationInstance(context);
61             if (applicationInstance == null)
62             {
63                 throw new HttpException(SR.GetString("Unable_create_app_object"));
64             }
65             if (EtwTrace.IsTraceEnabled(5, 1))
66             {
67                 EtwTrace.Trace(EtwTraceType.ETW_TYPE_START_HANDLER, context.WorkerRequest, applicationInstance.GetType().FullName, "Start");
68             }
69             if (applicationInstance is IHttpAsyncHandler)
70             {
71                 IHttpAsyncHandler handler2 = (IHttpAsyncHandler) applicationInstance;
72                 context.AsyncAppHandler = handler2;
73                 handler2.BeginProcessRequest(context, this._handlerCompletionCallback, context);
74             }
75             else
76             {
77                 applicationInstance.ProcessRequest(context);
78                 this.FinishRequest(context.WorkerRequest, context, null);
79             }
80         }
81         catch (Exception exception)
82         {
83             context.Response.InitResponseWriter();
84             this.FinishRequest(wr, context, exception);
85         }
86     }
87 }
88 
89  
90 
91

View Code

在这里创建了上下文 HttpContext context;对象，使用wr（wr中封装了请求信息）对象创建了上下文对象 context = new HttpContext(wr, false);

IHttpHandler applicationInstance = HttpApplicationFactory.GetApplicationInstance(context);使用HttpApplicationFactory创建HttpApplication对象，applicationInstance.ProcessRequest(context);在这个方法中会调用近20几个是事件，该对象在后面的事件中通过反射创建请求页面类的对象在第7个事件和第8个事件中间通过反射创建前台页面类对象，后续的事件之间又调用页面类对象的ProcessRequest方法，这就是我们写的asp.net程序后台类为什么有ProcessRequest方法了，我们应该知道前台页面类继承后台页面类，我在这里再贴一下HttpApplication类的代码

  1 [ToolboxItem(false)]
  2 public class HttpApplication : IComponent, IDisposable, IHttpAsyncHandler, IHttpHandler, IRequestCompletedNotifier, ISyncContext
  3 {
  4     // Fields
  5     private EventArgs _appEvent;
  6     private bool _appLevelAutoCulture;
  7     private bool _appLevelAutoUICulture;
  8     private CultureInfo _appLevelCulture;
  9     private CultureInfo _appLevelUICulture;
 10     private RequestNotification _appPostNotifications;
 11     private RequestNotification _appRequestNotifications;
 12     private HttpAsyncResult _ar;
 13     private AsyncAppEventHandlersTable _asyncEvents;
 14     private HttpContext _context;
 15     private string _currentModuleCollectionKey;
 16     private static readonly DynamicModuleRegistry _dynamicModuleRegistry;
 17     private byte[] _entityBuffer;
 18     private EventHandlerList _events;
 19     private Hashtable _handlerFactories;
 20     private ArrayList _handlerRecycleList;
 21     private bool _hideRequestResponse;
 22     private HttpContext _initContext;
 23     private bool _initInternalCompleted;
 24     private static bool _initSpecialCompleted;
 25     private Exception _lastError;
 26     private HttpModuleCollection _moduleCollection;
 27     private static List<ModuleConfigurationInfo> _moduleConfigInfo;
 28     private PipelineModuleStepContainer[] _moduleContainers;
 29     private static Hashtable _moduleIndexMap;
 30     private Dictionary<string, RequestNotification> _pipelineEventMasks;
 31     private WaitCallback _resumeStepsWaitCallback;
 32     private CultureInfo _savedAppLevelCulture;
 33     private CultureInfo _savedAppLevelUICulture;
 34     private HttpSessionState _session;
 35     private ISite _site;
 36     private HttpApplicationState _state;
 37     private StepManager _stepManager;
 38     private bool _timeoutManagerInitialized;
 39     internal CountdownTask ApplicationInstanceConsumersCounter;
 40     internal static readonly string AutoCulture;
 41     private static readonly object EventAcquireRequestState;
 42     private static readonly object EventAuthenticateRequest;
 43     private static readonly object EventAuthorizeRequest;
 44     private static readonly object EventBeginRequest;
 45     private static readonly object EventDefaultAuthentication;
 46     private static readonly object EventDisposed;
 47     private static readonly object EventEndRequest;
 48     private static readonly object EventErrorRecorded;
 49     private static readonly object EventLogRequest;
 50     private static readonly object EventMapRequestHandler;
 51     private static readonly object EventPostAcquireRequestState;
 52     private static readonly object EventPostAuthenticateRequest;
 53     private static readonly object EventPostAuthorizeRequest;
 54     private static readonly object EventPostLogRequest;
 55     private static readonly object EventPostMapRequestHandler;
 56     private static readonly object EventPostReleaseRequestState;
 57     private static readonly object EventPostRequestHandlerExecute;
 58     private static readonly object EventPostResolveRequestCache;
 59     private static readonly object EventPostUpdateRequestCache;
 60     private static readonly object EventPreRequestHandlerExecute;
 61     private static readonly object EventPreSendRequestContent;
 62     private static readonly object EventPreSendRequestHeaders;
 63     private static readonly object EventReleaseRequestState;
 64     private static readonly object EventRequestCompleted;
 65     private static readonly object EventResolveRequestCache;
 66     private static readonly object EventUpdateRequestCache;
 67     internal const string IMPLICIT_FILTER_MODULE = "AspNetFilterModule";
 68     internal const string IMPLICIT_HANDLER = "ManagedPipelineHandler";
 69     internal const string MANAGED_PRECONDITION = "managedHandler";
 70 
 71     // Events
 72     public event EventHandler AcquireRequestState;
 73     public event EventHandler AuthenticateRequest;
 74     public event EventHandler AuthorizeRequest;
 75     public event EventHandler BeginRequest;
 76     internal event EventHandler DefaultAuthentication;
 77     public event EventHandler Disposed;
 78     public event EventHandler EndRequest;
 79     public event EventHandler Error;
 80     public event EventHandler LogRequest;
 81     public event EventHandler MapRequestHandler;
 82     public event EventHandler PostAcquireRequestState;
 83     public event EventHandler PostAuthenticateRequest;
 84     public event EventHandler PostAuthorizeRequest;
 85     public event EventHandler PostLogRequest;
 86     public event EventHandler PostMapRequestHandler;
 87     public event EventHandler PostReleaseRequestState;
 88     public event EventHandler PostRequestHandlerExecute;
 89     public event EventHandler PostResolveRequestCache;
 90     public event EventHandler PostUpdateRequestCache;
 91     public event EventHandler PreRequestHandlerExecute;
 92     public event EventHandler PreSendRequestContent;
 93     public event EventHandler PreSendRequestHeaders;
 94     public event EventHandler ReleaseRequestState;
 95     public event EventHandler RequestCompleted;
 96     public event EventHandler ResolveRequestCache;
 97     public event EventHandler UpdateRequestCache;
 98 
 99     // Methods
100     static HttpApplication();
101     public HttpApplication();
102     internal void AcquireNotifcationContextLock(ref bool locked);
103     private void AddEventMapping(string moduleName, RequestNotification requestNotification, bool isPostNotification, IExecutionStep step);
104     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
105     public void AddOnAcquireRequestStateAsync(BeginEventHandler bh, EndEventHandler eh);
106     public void AddOnAcquireRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
107     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
108     public void AddOnAuthenticateRequestAsync(BeginEventHandler bh, EndEventHandler eh);
109     public void AddOnAuthenticateRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
110     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
111     public void AddOnAuthorizeRequestAsync(BeginEventHandler bh, EndEventHandler eh);
112     public void AddOnAuthorizeRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
113     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
114     public void AddOnBeginRequestAsync(BeginEventHandler bh, EndEventHandler eh);
115     public void AddOnBeginRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
116     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
117     public void AddOnEndRequestAsync(BeginEventHandler bh, EndEventHandler eh);
118     public void AddOnEndRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
119     public void AddOnLogRequestAsync(BeginEventHandler bh, EndEventHandler eh);
120     public void AddOnLogRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
121     public void AddOnMapRequestHandlerAsync(BeginEventHandler bh, EndEventHandler eh);
122     public void AddOnMapRequestHandlerAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
123     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
124     public void AddOnPostAcquireRequestStateAsync(BeginEventHandler bh, EndEventHandler eh);
125     public void AddOnPostAcquireRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
126     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
127     public void AddOnPostAuthenticateRequestAsync(BeginEventHandler bh, EndEventHandler eh);
128     public void AddOnPostAuthenticateRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
129     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
130     public void AddOnPostAuthorizeRequestAsync(BeginEventHandler bh, EndEventHandler eh);
131     public void AddOnPostAuthorizeRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
132     public void AddOnPostLogRequestAsync(BeginEventHandler bh, EndEventHandler eh);
133     public void AddOnPostLogRequestAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
134     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
135     public void AddOnPostMapRequestHandlerAsync(BeginEventHandler bh, EndEventHandler eh);
136     public void AddOnPostMapRequestHandlerAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
137     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
138     public void AddOnPostReleaseRequestStateAsync(BeginEventHandler bh, EndEventHandler eh);
139     public void AddOnPostReleaseRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
140     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
141     public void AddOnPostRequestHandlerExecuteAsync(BeginEventHandler bh, EndEventHandler eh);
142     public void AddOnPostRequestHandlerExecuteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
143     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
144     public void AddOnPostResolveRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh);
145     public void AddOnPostResolveRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
146     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
147     public void AddOnPostUpdateRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh);
148     public void AddOnPostUpdateRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
149     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
150     public void AddOnPreRequestHandlerExecuteAsync(BeginEventHandler bh, EndEventHandler eh);
151     public void AddOnPreRequestHandlerExecuteAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
152     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
153     public void AddOnReleaseRequestStateAsync(BeginEventHandler bh, EndEventHandler eh);
154     public void AddOnReleaseRequestStateAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
155     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
156     public void AddOnResolveRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh);
157     public void AddOnResolveRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
158     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
159     public void AddOnUpdateRequestCacheAsync(BeginEventHandler bh, EndEventHandler eh);
160     public void AddOnUpdateRequestCacheAsync(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
161     private void AddSendResponseEventHookup(object key, Delegate handler);
162     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
163     internal void AddSyncEventHookup(object key, Delegate handler, RequestNotification notification);
164     private void AddSyncEventHookup(object key, Delegate handler, RequestNotification notification, bool isPostNotification);
165     internal void AssignContext(HttpContext context);
166     internal IAsyncResult BeginProcessRequestNotification(HttpContext context, AsyncCallback cb);
167     private void BuildEventMaskDictionary(Dictionary<string, RequestNotification> eventMask);
168     private HttpModuleCollection BuildIntegratedModuleCollection(List<ModuleConfigurationInfo> moduleList);
169     internal void ClearError();
170     public void CompleteRequest();
171     private HttpModuleCollection CreateDynamicModules();
172     private void CreateEventExecutionSteps(object eventIndex, ArrayList steps);
173     internal IExecutionStep CreateImplicitAsyncPreloadExecutionStep();
174     public virtual void Dispose();
175     internal void DisposeInternal();
176     internal RequestNotificationStatus EndProcessRequestNotification(IAsyncResult result);
177     internal void EnsureReleaseState();
178     internal Exception ExecuteStep(IExecutionStep step, ref bool completedSynchronously);
179     private IEnumerable<ModuleConfigurationInfo> GetConfigInfoForDynamicModules();
180     [SecurityPermission(SecurityAction.Assert, ControlPrincipal=true)]
181     internal static WindowsIdentity GetCurrentWindowsIdentityWithAssert();
182     private IHttpHandlerFactory GetFactory(string type);
183     private IHttpHandlerFactory GetFactory(HttpHandlerAction mapping);
184     internal static string GetFallbackCulture(string culture);
185     private HttpHandlerAction GetHandlerMapping(HttpContext context, string requestType, VirtualPath path, bool useAppConfig);
186     private HttpModuleCollection GetModuleCollection(IntPtr appContext);
187     private PipelineModuleStepContainer GetModuleContainer(string moduleName);
188     public virtual string GetOutputCacheProviderName(HttpContext context);
189     public virtual string GetVaryByCustomString(HttpContext context, string custom);
190     private bool HasEventSubscription(object eventIndex);
191     private void HookupEventHandlersForApplicationAndModules(MethodInfo[] handlers);
192     public virtual void Init();
193     private void InitAppLevelCulture();
194     private void InitIntegratedModules();
195     internal void InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers);
196     private void InitModules();
197     private void InitModulesCommon();
198     internal void InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context);
199     [ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.RestrictedMemberAccess)]
200     private void InvokeMethodWithAssert(MethodInfo method, int paramCount, object eventSource, EventArgs eventArgs);
201     internal IHttpHandler MapHttpHandler(HttpContext context, string requestType, VirtualPath path, string pathTranslated, bool useAppConfig);
202     internal IHttpHandler MapIntegratedHttpHandler(HttpContext context, string requestType, VirtualPath path, string pathTranslated, bool useAppConfig, bool convertNativeStaticFileModule);
203     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
204     internal ThreadContext OnThreadEnter();
205     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
206     internal ThreadContext OnThreadEnter(bool setImpersonationContext);
207     private ThreadContext OnThreadEnterPrivate(bool setImpersonationContext);
208     private void ProcessEventSubscriptions(out RequestNotification requestNotifications, out RequestNotification postRequestNotifications);
209     internal void ProcessSpecialRequest(HttpContext context, MethodInfo method, int paramCount, object eventSource, EventArgs eventArgs, HttpSessionState session);
210     internal void RaiseErrorWithoutContext(Exception error);
211     private void RaiseOnError();
212     internal void RaiseOnPreSendRequestContent();
213     internal void RaiseOnPreSendRequestHeaders();
214     private void RaiseOnRequestCompleted();
215     private void RecordError(Exception error);
216     private void RecycleHandlers();
217     private void RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers);
218     private void RegisterIntegratedEvent(IntPtr appContext, string moduleName, RequestNotification requestNotifications, RequestNotification postRequestNotifications, string moduleType, string modulePrecondition, bool useHighPriority);
219     public static void RegisterModule(Type moduleType);
220     internal static void RegisterModuleInternal(Type moduleType);
221     internal void ReleaseAppInstance();
222     internal void ReleaseNotifcationContextLock();
223     private void RemoveSendResponseEventHookup(object key, Delegate handler);
224     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
225     internal void RemoveSyncEventHookup(object key, Delegate handler, RequestNotification notification);
226     internal void RemoveSyncEventHookup(object key, Delegate handler, RequestNotification notification, bool isPostNotification);
227     private void RestoreAppLevelCulture();
228     private void ResumeSteps(Exception error);
229     private void ResumeStepsFromThreadPoolThread(Exception error);
230     private void ResumeStepsWaitCallback(object error);
231     private void SetAppLevelCulture();
232     [SecurityPermission(SecurityAction.Assert, ControlPrincipal=true)]
233     internal static void SetCurrentPrincipalWithAssert(IPrincipal user);
234     IAsyncResult IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData);
235     void IHttpAsyncHandler.EndProcessRequest(IAsyncResult result);
236     void IHttpHandler.ProcessRequest(HttpContext context);
237     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
238     ISyncContextLock ISyncContext.Enter();
239     private void ThrowIfEventBindingDisallowed();
240 
241     // Properties
242     internal EventArgs AppEvent { get; set; }
243     [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)]
244     public HttpApplicationState Application { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
245     private AsyncAppEventHandlersTable AsyncEvents { get; }
246     internal HttpAsyncResult AsyncResult { get; set; }
247     [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)]
248     public HttpContext Context { get; }
249     internal string CurrentModuleCollectionKey { get; }
250     private PipelineModuleStepContainer CurrentModuleContainer { get; }
251     internal byte[] EntityBuffer { get; }
252     protected EventHandlerList Events { get; }
253     internal static List<ModuleConfigurationInfo> IntegratedModuleList { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
254     private bool IsContainerInitalizationAllowed { get; }
255     internal bool IsRequestCompleted { get; }
256     internal Exception LastError { get; }
257     private PipelineModuleStepContainer[] ModuleContainers { get; }
258     [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
259     public HttpModuleCollection Modules { [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.High)] get; }
260     [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)]
261     public HttpRequest Request { get; }
262     [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
263     public HttpResponse Response { get; }
264     [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Browsable(false)]
265     public HttpServerUtility Server { get; }
266     [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
267     public HttpSessionState Session { get; }
268     [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
269     public ISite Site { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] set; }
270     bool IHttpHandler.IsReusable { get; }
271     bool IRequestCompletedNotifier.IsRequestCompleted { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
272     HttpContext ISyncContext.HttpContext { get; }
273     [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
274     public IPrincipal User { get; }
275 
276     // Nested Types
277     internal class ApplicationStepManager : HttpApplication.StepManager
278     {
279         // Fields
280         private int _currentStepIndex;
281         private int _endRequestStepIndex;
282         private HttpApplication.IExecutionStep[] _execSteps;
283         private int _numStepCalls;
284         private int _numSyncStepCalls;
285         private WaitCallback _resumeStepsWaitCallback;
286 
287         // Methods
288         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
289         internal ApplicationStepManager(HttpApplication app);
290         internal override void BuildSteps(WaitCallback stepCallback);
291         internal override void InitRequest();
292         [DebuggerStepperBoundary]
293         internal override void ResumeSteps(Exception error);
294     }
295 
296     internal class AsyncAppEventHandler
297     {
298         // Fields
299         private ArrayList _beginHandlers;
300         private int _count;
301         private ArrayList _endHandlers;
302         private ArrayList _stateObjects;
303 
304         // Methods
305         internal AsyncAppEventHandler();
306         internal void Add(BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
307         internal void CreateExecutionSteps(HttpApplication app, ArrayList steps);
308         internal void Reset();
309 
310         // Properties
311         internal int Count { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
312     }
313 
314     internal class AsyncAppEventHandlersTable
315     {
316         // Fields
317         private Hashtable _table;
318 
319         // Methods
320         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
321         public AsyncAppEventHandlersTable();
322         internal void AddHandler(object eventId, BeginEventHandler beginHandler, EndEventHandler endHandler, object state, RequestNotification requestNotification, bool isPost, HttpApplication app);
323 
324         // Properties
325         internal HttpApplication.AsyncAppEventHandler this[object eventId] { get; }
326     }
327 
328     internal class AsyncEventExecutionStep : HttpApplication.IExecutionStep
329     {
330         // Fields
331         private HttpApplication _application;
332         private HttpApplication.AsyncStepCompletionInfo _asyncStepCompletionInfo;
333         private BeginEventHandler _beginHandler;
334         private AsyncCallback _completionCallback;
335         private EndEventHandler _endHandler;
336         private object _state;
337         private bool _sync;
338         private string _targetTypeStr;
339 
340         // Methods
341         internal AsyncEventExecutionStep(HttpApplication app, BeginEventHandler beginHandler, EndEventHandler endHandler, object state);
342         internal AsyncEventExecutionStep(HttpApplication app, BeginEventHandler beginHandler, EndEventHandler endHandler, object state, bool useIntegratedPipeline);
343         private void OnAsyncEventCompletion(IAsyncResult ar);
344         private void ResumeSteps(Exception error);
345         [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
346         private void ResumeStepsWithAssert(Exception error);
347         void HttpApplication.IExecutionStep.Execute();
348 
349         // Properties
350         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
351         bool HttpApplication.IExecutionStep.IsCancellable { get; }
352     }
353 
354     [StructLayout(LayoutKind.Sequential)]
355     private struct AsyncStepCompletionInfo
356     {
357         private volatile int _asyncState;
358         private ExceptionDispatchInfo _error;
359         private const int ASYNC_STATE_NONE = 0;
360         private const int ASYNC_STATE_BEGIN_UNWOUND = 1;
361         private const int ASYNC_STATE_CALLBACK_COMPLETED = 2;
362         public bool RegisterAsyncCompletion(Exception error);
363         public void RegisterBeginUnwound(IAsyncResult asyncResult, out bool operationCompleted, out bool mustCallEndHandler);
364         public void ReportError();
365         public void Reset();
366     }
367 
368     internal class CallFilterExecutionStep : HttpApplication.IExecutionStep
369     {
370         // Fields
371         private HttpApplication _application;
372 
373         // Methods
374         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
375         internal CallFilterExecutionStep(HttpApplication app);
376         void HttpApplication.IExecutionStep.Execute();
377 
378         // Properties
379         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
380         bool HttpApplication.IExecutionStep.IsCancellable { get; }
381     }
382 
383     internal class CallHandlerExecutionStep : HttpApplication.IExecutionStep
384     {
385         // Fields
386         private HttpApplication _application;
387         private HttpApplication.AsyncStepCompletionInfo _asyncStepCompletionInfo;
388         private AsyncCallback _completionCallback;
389         private IHttpAsyncHandler _handler;
390         private bool _sync;
391 
392         // Methods
393         internal CallHandlerExecutionStep(HttpApplication app);
394         private void OnAsyncHandlerCompletion(IAsyncResult ar);
395         private void ResumeSteps(Exception error);
396         [PermissionSet(SecurityAction.Assert, Unrestricted=true)]
397         private void ResumeStepsWithAssert(Exception error);
398         private static void SuppressPostEndRequestIfNecessary(HttpContext context);
399         void HttpApplication.IExecutionStep.Execute();
400 
401         // Properties
402         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
403         bool HttpApplication.IExecutionStep.IsCancellable { get; }
404     }
405 
406     internal class CancelModuleException
407     {
408         // Fields
409         private bool _timeout;
410 
411         // Methods
412         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
413         internal CancelModuleException(bool timeout);
414 
415         // Properties
416         internal bool Timeout { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
417     }
418 
419     internal interface IExecutionStep
420     {
421         // Methods
422         void Execute();
423 
424         // Properties
425         bool CompletedSynchronously { get; }
426         bool IsCancellable { get; }
427     }
428 
429     internal class MapHandlerExecutionStep : HttpApplication.IExecutionStep
430     {
431         // Fields
432         private HttpApplication _application;
433 
434         // Methods
435         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
436         internal MapHandlerExecutionStep(HttpApplication app);
437         void HttpApplication.IExecutionStep.Execute();
438 
439         // Properties
440         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
441         bool HttpApplication.IExecutionStep.IsCancellable { get; }
442     }
443 
444     internal class MaterializeHandlerExecutionStep : HttpApplication.IExecutionStep
445     {
446         // Fields
447         private HttpApplication _application;
448 
449         // Methods
450         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
451         internal MaterializeHandlerExecutionStep(HttpApplication app);
452         void HttpApplication.IExecutionStep.Execute();
453 
454         // Properties
455         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
456         bool HttpApplication.IExecutionStep.IsCancellable { get; }
457     }
458 
459     internal class NoopExecutionStep : HttpApplication.IExecutionStep
460     {
461         // Methods
462         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
463         internal NoopExecutionStep();
464         void HttpApplication.IExecutionStep.Execute();
465 
466         // Properties
467         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
468         bool HttpApplication.IExecutionStep.IsCancellable { get; }
469     }
470 
471     internal class PipelineStepManager : HttpApplication.StepManager
472     {
473         // Fields
474         private WaitCallback _resumeStepsWaitCallback;
475         private bool _validateInputCalled;
476         private bool _validatePathCalled;
477 
478         // Methods
479         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
480         internal PipelineStepManager(HttpApplication app);
481         internal override void BuildSteps(WaitCallback stepCallback);
482         internal override void InitRequest();
483         [DebuggerStepperBoundary]
484         internal override void ResumeSteps(Exception error);
485         private Exception ValidateHelper(HttpContext context);
486     }
487 
488     internal class SendResponseExecutionStep : HttpApplication.IExecutionStep
489     {
490         // Fields
491         private HttpApplication _application;
492         private EventHandler _handler;
493         private bool _isHeaders;
494 
495         // Methods
496         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
497         internal SendResponseExecutionStep(HttpApplication app, EventHandler handler, bool isHeaders);
498         void HttpApplication.IExecutionStep.Execute();
499 
500         // Properties
501         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
502         bool HttpApplication.IExecutionStep.IsCancellable { get; }
503     }
504 
505     internal abstract class StepManager
506     {
507         // Fields
508         protected HttpApplication _application;
509         protected bool _requestCompleted;
510 
511         // Methods
512         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
513         internal StepManager(HttpApplication application);
514         internal abstract void BuildSteps(WaitCallback stepCallback);
515         internal void CompleteRequest();
516         internal abstract void InitRequest();
517         internal abstract void ResumeSteps(Exception error);
518 
519         // Properties
520         internal bool IsCompleted { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
521     }
522 
523     internal class SyncEventExecutionStep : HttpApplication.IExecutionStep
524     {
525         // Fields
526         private HttpApplication _application;
527         private EventHandler _handler;
528 
529         // Methods
530         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
531         internal SyncEventExecutionStep(HttpApplication app, EventHandler handler);
532         void HttpApplication.IExecutionStep.Execute();
533 
534         // Properties
535         internal EventHandler Handler { [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; }
536         bool HttpApplication.IExecutionStep.CompletedSynchronously { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; }
537         bool HttpApplication.IExecutionStep.IsCancellable { [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] get; }
538     }
539 
540     internal class TransitionToWebSocketsExecutionStep : HttpApplication.IExecutionStep
541     {
542         // Fields
543         private readonly HttpApplication _application;
544 
545         // Methods
546         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
547         internal TransitionToWebSocketsExecutionStep(HttpApplication app);
548         void HttpApplication.IExecutionStep.Execute();
549 
550         // Properties
551         public bool CompletedSynchronously { [CompilerGenerated, TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")] get; [CompilerGenerated] private set; }
552         public bool IsCancellable { get; }
553     }
554 
555     internal class UrlMappingsExecutionStep : HttpApplication.IExecutionStep
556     {
557         // Fields
558         private HttpApplication _application;
559 
560         // Methods
561         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
562         internal UrlMappingsExecutionStep(HttpApplication app);
563         void HttpApplication.IExecutionStep.Execute();
564 
565         // Properties
566         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
567         bool HttpApplication.IExecutionStep.IsCancellable { get; }
568     }
569 
570     internal class ValidatePathExecutionStep : HttpApplication.IExecutionStep
571     {
572         // Fields
573         private HttpApplication _application;
574 
575         // Methods
576         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
577         internal ValidatePathExecutionStep(HttpApplication app);
578         void HttpApplication.IExecutionStep.Execute();
579 
580         // Properties
581         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
582         bool HttpApplication.IExecutionStep.IsCancellable { get; }
583     }
584 
585     internal class ValidateRequestExecutionStep : HttpApplication.IExecutionStep
586     {
587         // Fields
588         private HttpApplication _application;
589 
590         // Methods
591         [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
592         internal ValidateRequestExecutionStep(HttpApplication app);
593         void HttpApplication.IExecutionStep.Execute();
594 
595         // Properties
596         bool HttpApplication.IExecutionStep.CompletedSynchronously { get; }
597         bool HttpApplication.IExecutionStep.IsCancellable { get; }
598     }
599 }
600 
601  
602 Expand Methods
603

View Code

感兴趣的可以看一下这里面的属性，事件（事件执行顺序并不是写的那个顺序）；下面我画张图，简单描述一下过程

剩下就是页面类执行ProcessRequest的方法了，今天先不说了，太晚了。接下来我们继续mvc也可以了，我们mvc并没有页面类的ProcessRequest方法，以后有时间在说这里吧。

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原文地址：https://www.cnblogs.com/ljs0322/p/3805163.html