详解ASP.NET MVC的整个生命周期_实用技巧_

 [TypeForwardedFrom("System.Web.Routing, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")] 　　public class RouteCollection : Collection 　　{ 　　 private class ReadLockDisposable : IDisposable 　　 { 　　 private ReaderWriterLockSlim _rwLock; 　　 public ReadLockDisposable(ReaderWriterLockSlim rwLock) 　　 { 　　 this._rwLock = rwLock; 　　 } 　　 void IDisposable.Dispose() 　　 { 　　 this._rwLock.ExitReadLock(); 　　 } 　　 } ...... 

 public class RouteTable { private static RouteCollection _instance = new RouteCollection(); public static RouteCollection Routes { get { return RouteTable._instance; } } } 

 namespace System.Web.Routing { [TypeForwardedFrom("System.Web.Routing, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")] public class UrlRoutingModule : IHttpModule { private static readonly object _contextKey = new object(); private static readonly object _requestDataKey = new object(); private RouteCollection _routeCollection; public RouteCollection RouteCollection { get { if (this._routeCollection == null) { this._routeCollection = RouteTable.Routes; } return this._routeCollection; } set { this._routeCollection = value; } } protected virtual void Dispose() { } protected virtual void Init(HttpApplication application) { if (application.Context.Items[UrlRoutingModule._contextKey] != null) { return; } application.Context.Items[UrlRoutingModule._contextKey] = UrlRoutingModule._contextKey; application.PostResolveRequestCache += new EventHandler(this.OnApplicationPostResolveRequestCache); } private void OnApplicationPostResolveRequestCache(object sender, EventArgs e) { HttpApplication httpApplication = (HttpApplication)sender; HttpContextBase context = new HttpContextWrapper(httpApplication.Context); this.PostResolveRequestCache(context); } [Obsolete("This method is obsolete. Override the Init method to use the PostMapRequestHandler event.")] public virtual void PostMapRequestHandler(HttpContextBase context) { } public virtual void PostResolveRequestCache(HttpContextBase context) { RouteData routeData = this.RouteCollection.GetRouteData(context); 第一步匹配路由规则 if (routeData == null) { return; } IRouteHandler routeHandler = routeData.RouteHandler; 第二步：如有匹配，就找到RouteHandler对象，该类型的实例是：MvcRouteHandler。 if (routeHandler == null) { throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, SR.GetString("UrlRoutingModule_NoRouteHandler"), new object[0])); } if (routeHandler is StopRoutingHandler) { return; } RequestContext requestContext = new RequestContext(context, routeData); context.Request.RequestContext = requestContext; IHttpHandler httpHandler = routeHandler.GetHttpHandler(requestContext);第三步，根据 RouteHandler 对象，找到最终处理请求的 IHttpHandler 的对象，该类型是 MvcHandler if (httpHandler == null) { throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture, SR.GetString("UrlRoutingModule_NoHttpHandler"), new object[] { routeHandler.GetType() })); } if (!(httpHandler is UrlAuthFailureHandler)) { context.RemapHandler(httpHandler);第四步，有找到的 IHttpHandler 处理请求。 return; } if (FormsAuthenticationModule.FormsAuthRequired) { UrlAuthorizationModule.ReportUrlAuthorizationFailure(HttpContext.Current, this); return; } throw new HttpException(401, SR.GetString("Assess_Denied_Description3")); } void IHttpModule.Dispose() { this.Dispose(); } void IHttpModule.Init(HttpApplication application) { this.Init(application); } } } 

 namespace System.Web.Mvc { /// 
Selects the controller that will handle an HTTP request.
 public class MvcHandler : IHttpAsyncHandler, IHttpHandler, IRequiresSessionState { private struct ProcessRequestState { internal IAsyncController AsyncController; internal IControllerFactory Factory; internal RequestContext RequestContext; internal void ReleaseController() { this.Factory.ReleaseController(this.AsyncController); } } [CompilerGenerated] [Serializable] private sealed class <>c { public static readonly MvcHandler.<>c <>9 = new MvcHandler.<>c(); public static BeginInvokeDelegate<>9__20_0; public static EndInvokeVoidDelegate<>9__20_1; public static Func, bool><>9__26_0; internal IAsyncResult b__20_0(AsyncCallback asyncCallback, object asyncState, MvcHandler.ProcessRequestState innerState) { IAsyncResult result; try { result = innerState.AsyncController.BeginExecute(innerState.RequestContext, asyncCallback, asyncState); } catch { innerState.ReleaseController(); throw; } return result; } internal void b__20_1(IAsyncResult asyncResult, MvcHandler.ProcessRequestState innerState) { try { innerState.AsyncController.EndExecute(asyncResult); } finally { innerState.ReleaseController(); } } internal bool b__26_0(KeyValuePair entry) { return entry.Value == UrlParameter.Optional; } } private static readonly object _processRequestTag = new object(); internal static readonly string MvcVersion = MvcHandler.GetMvcVersionString(); /// 
Contains the header name of the ASP.NET MVC version.
 public static readonly string MvcVersionHeaderName = "X-AspNetMvc-Version"; private ControllerBuilder _controllerBuilder; internal ControllerBuilder ControllerBuilder { get { if (this._controllerBuilder == null) { this._controllerBuilder = ControllerBuilder.Current; } return this._controllerBuilder; } set { this._controllerBuilder = value; } } /// 
Gets or sets a value that indicates whether the MVC response header is disabled.
 /// true if the MVC response header is disabled; otherwise, false. public static bool DisableMvcResponseHeader { get; set; } /// 
Gets a value that indicates whether another request can use the  instance.
 /// true if the  instance is reusable; otherwise, false. protected virtual bool IsReusable { get { return false; } } /// 
Gets the request context.
 /// The request context. public RequestContext RequestContext { get; private set; } /// 
Gets a value that indicates whether another request can use the  instance.
 /// true if the  instance is reusable; otherwise, false. bool IHttpHandler.IsReusable { get { return this.IsReusable; } } /// 
Initializes a new instance of the  class.
 /// The request context. /// The  parameter is null. public MvcHandler(RequestContext requestContext) { if (requestContext == null) { throw new ArgumentNullException("requestContext"); } this.RequestContext = requestContext; } /// 
Adds the version header by using the specified HTTP context.
 /// The HTTP context. protected internal virtual void AddVersionHeader(HttpContextBase httpContext) { if (!MvcHandler.DisableMvcResponseHeader) { httpContext.Response.AppendHeader(MvcHandler.MvcVersionHeaderName, MvcHandler.MvcVersion); } } /// 
Called by 
                
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