在web.config中註冊ASP.NET Http處理程序有多種方法？

Question

添加和刪除處理程序與之相反的區別是什麼？

在一個新的Web項目，我用VS2008做，處理程序被定義爲這樣的：

<system.web> 
     ... 

     <httpHandlers> 
     <remove verb="*" path="*.asmx"/> 
     <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
     <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
     <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/> 
     <add verb="*" path="/hello/helloworld.xml" type="HandlerTest.HelloWorldHandler, HandlerTest"/> 
     </httpHandlers> 
     <httpModules> 
     <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
     </httpModules> 

    </system.web> 

但是，在一個預先存在的項目（即：社區服務器）中，HTTP處理程序添加/刪除如下：

<system.webServer> 
     <validation validateIntegratedModeConfiguration="false"/> 
     <security> 
      <requestFiltering allowDoubleEscaping="true"/> 
     </security> 
     <modules runAllManagedModulesForAllRequests="true"> 
      <remove name="CommunityServer"/> 
      <remove name="ScriptModule"/> 
      <remove name="UrlRoutingModule"/> 
      <add name="CommunityServer" type="CommunityServer.CSHttpModule, CommunityServer.Components"/> 
      <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
      <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web.Routing, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> 
     </modules> 
     <handlers accessPolicy="Read, Write, Script, Execute"> 
      <remove name="WebServiceHandlerFactory-Integrated"/> 
      <remove name="ScriptHandlerFactory"/> 
      <remove name="ScriptHandlerFactoryAppServices"/> 
      <remove name="ScriptResource"/> 


      <add verb="GET" name="redirect" path="Utility/redirect.aspx" type="CommunityServer.Components.Redirect, CommunityServer.Components"/> 
      <add verb="GET" name="aggbug" path="aggbug.aspx" type="CommunityServer.Components.HttpHandler.AggBugHandler, CommunityServer.Components"/> 
      <add verb="GET" name="avatar" path="avatar.aspx" type="CommunityServer.Components.HttpHandler.AvatarHttpHandler, CommunityServer.Components"/> 
      <add verb="GET" name="vcard" path="vcard.aspx" type="CommunityServer.Components.HttpHandler.VCardHttpHandler, CommunityServer.Components"/> 
      <add verb="GET" name="tinyurl" path="r.ashx" type="CommunityServer.Components.HttpHandler.TinyUrlHttpHandler, CommunityServer.Components"/> 
      <add verb="GET" name="weblogsubscription-confirmation" path="weblogsubscription-confirmation.ashx" type="CommunityServer.Blogs.Components.WeblogSubscriptionConfirmation, CommunityServer.Blogs"/> 
      <add verb="GET" name="threadsubscription-confirmation" path="threadsubscription-confirmation.ashx" type="CommunityServer.Blogs.Components.ThreadSubscriptionConfirmation, CommunityServer.Blogs"/> 
      <add verb="GET" name="cfs-file" path="cfs-file.ashx" type="CommunityServer.Components.FileHttpHandler, CommunityServer.Components"/> 
      <add verb="GET" name="cfs-filesystemfile" path="cfs-filesystemfile.ashx" type="CommunityServer.Components.FileSystemFileStorageHttpHandler, CommunityServer.Components"/> 
      <add verb="GET" name="resized-image" path="resized-image.ashx" type="CommunityServer.Components.ImageFileResizerHttpHandler, CommunityServer.Components"/> 
      <add verb="GET,POST" name="multipleupload" path="multipleupload.ashx" type="Telligent.Glow.MultipleUploadFileHandler, Telligent.Glow"/> 
      <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
      <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
      <add name="ScriptResource" verb="GET,HEAD" path="ScriptResource.axd" preCondition="integratedMode" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
      <add name="UrlRoutingHandler" preCondition="integratedMode" verb="*" path="UrlRouting.axd" type="System.Web.HttpForbiddenHandler, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/> 
      <add name="TinyMCE" verb="GET,HEAD,POST" path="TinyMCE.ashx" type="Moxiecode.TinyMCE.Web.HttpHandler,Moxiecode.TinyMCE"/> 
     <add name="Schedule" verb="*" path="schedule.ashx" type="CommunityServer.Scheduler.ScheduleHandler, CommunityServer.Scheduler" /> 
    </handlers> 
    </system.webServer> 

爲什麼有不止一種方法註冊http處理程序？

Answer 1

<system.web>部分適用於IIS6及以下版本，而<system.webServer>適用於IIS7及更高版本。 web.config的佈局是爲IIS7重新設計的，使其更強大/更友好，但是以向後兼容爲代價。

Answer 2

您發佈的第二個示例是在「節點」中配置IIS 7的方式，允許您直接配置服務器。另一種方法是「傳統」，適用於所有支持的IIS版本。