private void InitModules()
{　　 //注册配置文件中的HttpModuleCollection modules = RuntimeConfig.GetAppConfig().HttpModules.CreateModules();　　 //注册想要动态注册的HttpModuleCollection other = this.CreateDynamicModules();modules.AppendCollection(other);this._moduleCollection = modules;this.InitModulesCommon();
}

internal HttpModuleCollection CreateModules()
{HttpModuleCollection modules = new HttpModuleCollection();foreach (HttpModuleAction action in this.Modules){modules.AddModule(action.Entry.ModuleName, action.Entry.Create());}modules.AddModule("DefaultAuthentication", DefaultAuthenticationModule.CreateDefaultAuthenticationModuleWithAssert());return modules;
}

private HttpModuleCollection CreateDynamicModules()
{HttpModuleCollection modules = new HttpModuleCollection();foreach (DynamicModuleRegistryEntry entry in _dynamicModuleRegistry.LockAndFetchList()){HttpModuleAction action = new HttpModuleAction(entry.Name, entry.Type);modules.AddModule(action.Entry.ModuleName, action.Entry.Create());}return modules;
}

public ICollection<DynamicModuleRegistryEntry> LockAndFetchList()
{lock (this._lockObj){this._entriesReadonly = true;return this._entries;}
}

public static void RegisterModule(Type moduleType)
{if (!RuntimeConfig.GetAppConfig().HttpRuntime.AllowDynamicModuleRegistration){throw new InvalidOperationException(SR.GetString("DynamicModuleRegistrationOff"));}RegisterModuleInternal(moduleType);
}

internal static void RegisterModuleInternal(Type moduleType)
{_dynamicModuleRegistry.Add(moduleType);
}

private static readonly DynamicModuleRegistry _dynamicModuleRegistry;

public void Add(Type moduleType)
{if (moduleType == null){throw new ArgumentNullException("moduleType");}if (!typeof(IHttpModule).IsAssignableFrom(moduleType)){throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, 　　　　　　　　SR.GetString("DynamicModuleRegistry_TypeIsNotIHttpModule"),　　　　　　　　new object[] { moduleType }), "moduleType");}lock (this._lockObj){if (this._entriesReadonly){throw new InvalidOperationException(SR.GetString("DynamicModuleRegistry_ModulesAlreadyInitialized"));}this._entries.Add(new DynamicModuleRegistryEntry(MakeUniqueModuleName(moduleType), moduleType.AssemblyQualifiedName));}
} 

public class MyModules : IHttpModule
{public void Dispose() { }public void Init(HttpApplication context){context.BeginRequest += new EventHandler(MyBeginRequest);}void MyBeginRequest(object sender, EventArgs e){HttpApplication app = sender as HttpApplication;if (app != null){app.Response.Write("<p>经过MyModules处理过了</p>");}}
}

<modules><add name="MyModules" type="MyModule.MyModules"/>
</modules>

static MvcApplication()
{HttpApplication.RegisterModule(typeof(MyModules));
}

private void InitIntegratedModules()
{this._moduleCollection = this.BuildIntegratedModuleCollection(_moduleConfigInfo);this.InitModulesCommon();
}

private HttpModuleCollection BuildIntegratedModuleCollection(List<ModuleConfigurationInfo> moduleList)
{HttpModuleCollection modules = new HttpModuleCollection();foreach (ModuleConfigurationInfo info in moduleList){ModulesEntry entry = new ModulesEntry(info.Name, info.Type, "type", null);modules.AddModule(entry.ModuleName, entry.Create());}return modules;
}

private HttpApplication GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
{HttpApplication application = null;lock (this._specialFreeList){if (this._numFreeSpecialAppInstances > 0){application = (HttpApplication) this._specialFreeList.Pop();this._numFreeSpecialAppInstances--;}}if (application == null){using (new DisposableHttpContextWrapper(context)){application = (HttpApplication) HttpRuntime.CreateNonPublicInstance(this._theApplicationType);using (new ApplicationImpersonationContext()){application.InitSpecial(this._state, this._eventHandlerMethods, appContext, context);}}}return application;
}

internal void InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)
{this._state = state;try{if (context != null){this._initContext = context;this._initContext.ApplicationInstance = this;}if (appContext != IntPtr.Zero){using (new ApplicationImpersonationContext()){HttpRuntime.CheckApplicationEnabled();}this.InitAppLevelCulture();this.RegisterEventSubscriptionsWithIIS(appContext, context, handlers);}else{this.InitAppLevelCulture();if (handlers != null){this.HookupEventHandlersForApplicationAndModules(handlers);}}if ((appContext != IntPtr.Zero) && ((this._appPostNotifications != 0) || (this._appRequestNotifications != 0))){this.RegisterIntegratedEvent(appContext, "global.asax", 　　　　　　　　　　this._appRequestNotifications, 　　　　　　　　　　this._appPostNotifications, 　　　　　　　　　　base.GetType().FullName, "managedHandler", false);

        }}finally{_initSpecialCompleted = true;if (this._initContext != null){this._initContext.ApplicationInstance = null;this._initContext = null;}}
}

private void RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)
{RequestNotification notification;RequestNotification notification2;this.RegisterIntegratedEvent(appContext, "AspNetFilterModule", 　　　　RequestNotification.LogRequest | RequestNotification.UpdateRequestCache, 　　　　0, string.Empty, string.Empty, true);this._moduleCollection = this.GetModuleCollection(appContext);if (handlers != null){this.HookupEventHandlersForApplicationAndModules(handlers);}HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(context, this);this._currentModuleCollectionKey = "global.asax";try{this._hideRequestResponse = true;context.HideRequestResponse = true;this._context = context;this.Init();}catch (Exception exception){this.RecordError(exception);Exception error = context.Error;if (error != null){throw error;}}finally{this._context = null;context.HideRequestResponse = false;this._hideRequestResponse = false;}this.ProcessEventSubscriptions(out notification, out notification2);this._appRequestNotifications |= notification;this._appPostNotifications |= notification2;for (int i = 0; i < this._moduleCollection.Count; i++){this._currentModuleCollectionKey = this._moduleCollection.GetKey(i);IHttpModule module = this._moduleCollection.Get(i);ModuleConfigurationInfo info = _moduleConfigInfo[i];module.Init(this);this.ProcessEventSubscriptions(out notification, out notification2);if ((notification != 0) || (notification2 != 0)){this.RegisterIntegratedEvent(appContext, info.Name, notification, notification2, info.Type, info.Precondition, false);}}this.RegisterIntegratedEvent(appContext, "ManagedPipelineHandler", RequestNotification.ExecuteRequestHandler | RequestNotification.MapRequestHandler, RequestNotification.EndRequest, string.Empty, string.Empty, false);
}

private HttpModuleCollection GetModuleCollection(IntPtr appContext)
{if (_moduleConfigInfo == null){List<ModuleConfigurationInfo> list = null;IntPtr zero = IntPtr.Zero;IntPtr bstrModuleName = IntPtr.Zero;int cchModuleName = 0;IntPtr bstrModuleType = IntPtr.Zero;int cchModuleType = 0;IntPtr bstrModulePrecondition = IntPtr.Zero;int cchModulePrecondition = 0;try{int count = 0;int num5 = UnsafeIISMethods.MgdGetModuleCollection(IntPtr.Zero, appContext, out zero, out count);if (num5 < 0){throw new HttpException(SR.GetString("Cant_Read_Native_Modules", new object[] { num5.ToString("X8", CultureInfo.InvariantCulture) }));}list = new List<ModuleConfigurationInfo>(count);for (uint i = 0; i < count; i++){num5 = UnsafeIISMethods.MgdGetNextModule(zero, ref i, out bstrModuleName, out cchModuleName, out bstrModuleType, out cchModuleType, out bstrModulePrecondition, out cchModulePrecondition);if (num5 < 0){throw new HttpException(SR.GetString("Cant_Read_Native_Modules", new object[] { num5.ToString("X8", CultureInfo.InvariantCulture) }));}string str = (cchModuleName > 0) ? StringUtil.StringFromWCharPtr(bstrModuleName, cchModuleName) : null;string str2 = (cchModuleType > 0) ? StringUtil.StringFromWCharPtr(bstrModuleType, cchModuleType) : null;string condition = (cchModulePrecondition > 0) ? StringUtil.StringFromWCharPtr(bstrModulePrecondition, cchModulePrecondition) : string.Empty;Marshal.FreeBSTR(bstrModuleName);bstrModuleName = IntPtr.Zero;cchModuleName = 0;Marshal.FreeBSTR(bstrModuleType);bstrModuleType = IntPtr.Zero;cchModuleType = 0;Marshal.FreeBSTR(bstrModulePrecondition);bstrModulePrecondition = IntPtr.Zero;cchModulePrecondition = 0;if (!string.IsNullOrEmpty(str) && !string.IsNullOrEmpty(str2)){list.Add(new ModuleConfigurationInfo(str, str2, condition));}}}finally{if (zero != IntPtr.Zero){Marshal.Release(zero);zero = IntPtr.Zero;}if (bstrModuleName != IntPtr.Zero){Marshal.FreeBSTR(bstrModuleName);bstrModuleName = IntPtr.Zero;}if (bstrModuleType != IntPtr.Zero){Marshal.FreeBSTR(bstrModuleType);bstrModuleType = IntPtr.Zero;}if (bstrModulePrecondition != IntPtr.Zero){Marshal.FreeBSTR(bstrModulePrecondition);bstrModulePrecondition = IntPtr.Zero;}}list.AddRange(this.GetConfigInfoForDynamicModules());_moduleConfigInfo = list;}return this.BuildIntegratedModuleCollection(_moduleConfigInfo);
}

private IEnumerable<ModuleConfigurationInfo> GetConfigInfoForDynamicModules()
{return (from entry in _dynamicModuleRegistry.LockAndFetchList() 

　　　　select new ModuleConfigurationInfo(entry.Name, entry.Type, "managedHandler"));
}

private void InitModulesCommon()
{int count = this._moduleCollection.Count;for (int i = 0; i < count; i++){this._currentModuleCollectionKey = this._moduleCollection.GetKey(i);this._moduleCollection[i].Init(this);}this._currentModuleCollectionKey = null;this.InitAppLevelCulture();
}