C#反射调用其它DLL的委托事件 传值
在插件式开发。我们要调用其它插件或模块的委托事件时、那么我们需要通过反射。
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namespace Module2
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
[Plugin("MainWindow", "测试反射")]
public partial class MainWindow
{
public delegate void TestHandler(string msg,string info,string text);
public event TestHandler TestEvent;
public MainWindow()
{
InitializeComponent();
}
protected virtual void ValueInformation(string text, string info, string tb)
{
TestHandler handler = TestEvent;
if (handler != null)
handler(text,info,tb);
}
private void button1_Click(object sender, RoutedEventArgs e)
{
if (TestEvent != null)
{
}
ValueInformation("你好!钓鱼岛是中国的!!","打死小日本！！",textBox1.Text);
}
public override void UninstallEvent()
{
//添加已经打开的窗口 :在关闭的时候 要删除此项
ApplicationSharedData.LoadedPlugins.Remove("Module2.MainWindow");
base.UninstallEvent();
}
}
}
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/// <summary>
/// 模块之间 委托事件 通信
/// </summary>
/// <param name="currentWindow">当前的Window</param>
/// <param name="reflectioneventName">要反射模块中的 委托事件名称</param>
/// <param name="currentEventName">在当前类中要执行的事件名称</param>
/// <param name="filePath">反射文件的路经</param>
/// <param name="plugin">插件</param>
/// <param name="eventParameter">通信的消息</param>
public static void ModulEventCommunication(Window currentWindow, string reflectioneventName, string currentEventName, string filePath, Plugin plugin, object[] eventParameter)
{
if (reflectioneventName == null)
throw new ArgumentNullException("reflectioneventName");
if (currentEventName == null)
throw new ArgumentNullException("currentEventName");
if (filePath == null)
throw new ArgumentNullException("filePath");
if (eventParameter == null)
throw new ArgumentNullException("eventParameter");
try
{
Assembly assembly = Assembly.LoadFrom(filePath + plugin.NameSpace + "." + plugin.Exends);
Type[] type = assembly.GetTypes();
foreach (Type t in type)
{ //主要是判断该窗口是否实现 IElementsView 如果没有实现 就不需要反射或者不是插件
if (t.GetInterface("IElementsView") != null && t.Name == plugin.ClassName)
{
//注：在这里要判断是否已经加载：
if (LoadedPlugins.Contains(t.FullName))
{
return;
}
//反射执行的成员和类型搜索
const BindingFlags myBindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;
EventInfo eventInfo = t.GetEvent(reflectioneventName, myBindingFlags);
//获取到当前的类
var obj = (IElementsView)assembly.CreateInstance(t.FullName);
if (eventInfo != null)
{
Type tDelegate = eventInfo.EventHandlerType;
MethodInfo methodHandler = currentWindow.GetType().GetMethod(currentEventName,myBindingFlags);
//创建委托
Delegate d = Delegate.CreateDelegate(tDelegate, methodHandler);
//获取将要处理的事件委托
MethodInfo minAddHandler = eventInfo.GetAddMethod();
object[] addHandlerArgs = { d };
//调用
minAddHandler.Invoke(obj, addHandlerArgs);
FieldInfo field = t.GetField(reflectioneventName,myBindingFlags);
if (field != null)
{
Object fieldValue = field.GetValue(obj);
if (fieldValue != null && fieldValue is Delegate)
{
Delegate objectDelegate = fieldValue as Delegate;
//动态调用
objectDelegate.DynamicInvoke(eventParameter);
}
}
}
if (obj != null)
{
obj.ShowWindow();
//添加已经打开的窗口 :在关闭的时候 要删除此项
LoadedPlugins.Add(t.FullName);
}
}
}
}
catch (FileNotFoundException)
{
MessageBox.Show("尊敬的用户您好！没有找到相应的模块！", "插件提示！", MessageBoxButton.OK,
MessageBoxImage.Information);
}
catch (TargetParameterCountException)
{
MessageBox.Show("尊敬的用户您好！在调用模块时发现委托的参数不同！请检查参数的个数！", "插件提示!", MessageBoxButton.OK,
MessageBoxImage.Information);
}
catch (Exception)
{
MessageBox.Show("尊敬的用户您好！系统发现版本与当前系统不匹配！", "插件提示！", MessageBoxButton.OK,
MessageBoxImage.Information);
}
}
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本模块调用：
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void Test2_Click(object sender, RoutedEventArgs e)
{
var item = (MenuItem)sender;
string path = @Environment.CurrentDirectory + "\";
Plugin plugin = ApplicationSharedData.Plugins[item.Header.ToString()];
ApplicationSharedData.ModulEventCommunication(this, "TestEvent", "DeleBindData", path, plugin, new object[] { "参数1", "参数2","" });
//注 在反射TestEvent 时候 ，TestEvent有几个参数 那么S_TestEvent 也有几个参数。
//不然会抛出异常信息，TargetParameterCountException 参数的个数不同
}
private static void DeleBindData(string msg, string info,string tb)
{
_textbox.Text = tb;
}
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void Test2_Click(object sender, RoutedEventArgs e)
{
var item = (MenuItem)sender;
string path = @Environment.CurrentDirectory + "\";
Plugin plugin = ApplicationSharedData.Plugins[item.Header.ToString()];
ApplicationSharedData.ModulEventCommunication(this, "TestEvent", "DeleBindData", path, plugin, new object[] { "参数1", "参数2","" });
//注 在反射TestEvent 时候 ，TestEvent有几个参数 那么S_TestEvent 也有几个参数。
//不然会抛出异常信息，TargetParameterCountException 参数的个数不同
}
private static void DeleBindData(string msg, string info,string tb)
{
_textbox.Text = tb;
}