asp.net web form中 用attribute实现权限验证方式

以前项目的代码比较陈旧,今天抽空优化了一下.作为记录.

以前每次请求一个方法都要验证是否登录 if xxx等  现在通过global文件中的改进 反射这个方法的属性是否需要权限 

要的话先验证权限.以下代码 只提供思路和演示.

如何使用

global中的写法是

  protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {

            if (HttpContext.Current != null)
            {
                byte[] byts = new byte[HttpContext.Current.Request.InputStream.Length];

                HttpContext.Current.Request.InputStream.Read(byts, 0, byts.Length);
                string req = System.Text.Encoding.Default.GetString(byts);
                req = HttpContext.Current.Server.UrlDecode(req);
                if (!string.IsNullOrEmpty(req))
                {
                    req = req.Replace("data=", "");
                    var ajaxModel =  Utils.JsonHelper.FromJson<AjaxRequestModel>(req);//把请求的流转换为json
                    string methodName = ajaxModel.MethodAlias;
                    var className = AjaxCache.GetClassName(methodName);
                 
                    string assemblyName = "Test.Module";

                    if (!String.IsNullOrEmpty(assemblyName) && !String.IsNullOrEmpty(className))
                    {
                        Assembly assembly = GetAssembly(assemblyName);//我这里用的缓存来实现资源加载的不然每次都需要反射
                        Type type = assembly.GetType(className, true, true);
                        if (type != null)
                        {
                            MethodInfo[] methodInfos = type.GetMethods();
                            foreach (MethodInfo mi in methodInfos)
                            {
                                System.Attribute[] attrs = System.Attribute.GetCustomAttributes(mi);  //反射获得用户自定义属性
                                foreach (System.Attribute attr in attrs)
                                {
                                    if (attr is CheckLoginAttribute)
                                    {
                                        CheckLoginAttribute a = (CheckLoginAttribute)attr;
                                        System.Console.WriteLine("过了没? ", a.IsLogin);//这里也可以处理 也可以不处理.
                                    }
                                }

                            }

                        }
                    }

                }
            }
        }

   /// <summary>
        /// 反射资源缓存调用
        /// </summary>
        /// <param name="assemblyName"></param>
        /// <returns></returns>
        private static Assembly GetAssembly(string assemblyName)
        {
            object assemblyObject = CacheHelper.GetCache(assemblyName);//这里可以用 iis缓存来实现

            if (assemblyObject == null)
            {
                Assembly assembly = null;
                assembly = Assembly.Load(assemblyName);
                CacheHelper.SetCache(assemblyName, assembly, DateTime.Now.AddMinutes(60));
                return assembly;
            }
            else
            {
                return (Assembly)assemblyObject;
            }
        }

 [AttributeUsage(AttributeTargets.Method,AllowMultiple=false, Inherited=true  )]
    public class CheckLoginAttribute : Attribute
    {
       

        /// <summary>
        /// 检测是否登录
        /// </summary>


        public bool IsLogin { get; set; }
        public   CheckLoginAttribute(  )
        {
            try
            {
                if (1==1)
                {
                    IsLogin = true;
                    //throw new Exception("登录错啦");
                    //var model = new ResponseInfo { State = ResultState.Failed, ErrorMessage = "您未登录,请登录!" };
                    //HttpContext.Current.Response.Write(JsonConvert.SerializeObject(model));
                    //HttpContext.Current.Response.End();
                }
                else
                {
                    HttpContext.Current.Response.Clear();
                    HttpContext.Current.Response.Write("{State:1,Msg='未登录'}");
                    HttpContext.Current.Response.End();
                    
                }

            }
            catch (Exception ex)
            {
                LogHelper.WriteExceptionLog("CheckLoginAttribute", ex);
                throw;
            }

        }

    }