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我开发了 ASP.NET Web API 应用程序,当我在 Visual Studio 2010 下运行它时它运行良好。它运行起来非常完美。但是当我将它(xcopy)部署到 Web 服务器时,它会崩溃并且无法运行:

你调用的对象是空的。 System.Web.HttpApplication.ExecuteStep。 System.Web.Http.Dispatcher.HttpRoutingDispatcher.SendAsync

到目前为止,我已经尝试过:使用 IIS (aspnet_regiis.exe -i) 为 x32 和 x64 版本的 .NET 重新注册 ASP.NET 使用 VS 2010 Build deployment package 命令部署应用程序,然后将此包导出到 IIS。

有什么想法吗?

PS 其他 ASP.NET 4.0 应用程序(不是 MVC/Web API)在同一台服务器上运行良好。

更新:我的 web.config 的一部分(不包括连接字符串和应用程序设置)

<system.web>
<customErrors mode="Off"/>
<compilation debug="true" targetFramework="4.0" />
<authentication mode="None" />
<pages>
  <namespaces>
    <add namespace="System.Web.Helpers" />
    <add namespace="System.Web.Mvc" />
    <add namespace="System.Web.Mvc.Ajax" />
    <add namespace="System.Web.Mvc.Html" />
    <add namespace="System.Web.Optimization" />
    <add namespace="System.Web.Routing" />
    <add namespace="System.Web.WebPages" />
  </namespaces>
</pages>
<profile defaultProvider="DefaultProfileProvider">
  <providers>
    <add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
  </providers>
</profile>
<membership defaultProvider="DefaultMembershipProvider">
  <providers>
    <add name="DefaultMembershipProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
  </providers>
</membership>
<roleManager defaultProvider="DefaultRoleProvider">
  <providers>
    <add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
  </providers>
</roleManager>
<sessionState mode="InProc" customProvider="DefaultSessionProvider">
  <providers>
    <add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
  </providers>
</sessionState> </system.web>  



  <system.webServer>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true" />
<handlers>
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>  </system.webServer>


<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
  </dependentAssembly>
</assemblyBinding>  </runtime>  

<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />  </entityFramework>
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1 回答 1

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我 90% 确定这里的问题与您的自定义消息处理程序有关。我相信这是一个错误,但团队坚持认为这不是。不知道他们将如何处理它。这是演习:

如果您在任何消息处理程序中从头开始创建响应,则默认情况下它显然不带有该RequestMessage属性。因此,它以著名的“对象引用未设置为对象的实例”而惨遭失败。一使用就报错。例如,设置RequestMessage属性的打击代码HttpResponseMessage解决了问题,但我认为这应该由框架完成:

public class TerminatingMessageHandler : DelegatingHandler {

    protected override Task<HttpResponseMessage> SendAsync(
        HttpRequestMessage request, 
        CancellationToken cancellationToken) {

        var response = new HttpResponseMessage(HttpStatusCode.OK);
        response.RequestMessage = request;
        return Task.FromResult(response).ContinueWith(task => {

            var responseMsg = task.Result;

            var httpContext = responseMsg.RequestMessage.Properties["MS_HttpContext"] as HttpContextWrapper;
            if (httpContext != null)
                httpContext.Response.Headers.Remove("Server");

            return responseMsg;
        });
    }
}

这是错误报告:http ://aspnetwebstack.codeplex.com/workitem/408如果您是这种情况,如果您也希望修复此问题,您可以投票并在此处发表评论。

于 2012-11-14T14:38:23.613 回答