报告查看器中的报告配置错误

Question

我收到报表查看器配置错误，httpHandlers丢失错误。在应用程序中，我使用了其他报表查看器，但它们正常工作。我找到了在web.config文件中添加httpHandlers的解决方案。但是我已经在system.web中定义了httpHandlers。

    <system.web>
<authorization>
  <allow users="*" />
</authorization>
<sessionState timeout="1440" mode="InProc" />
<httpHandlers>
  <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" validate="false" />
</httpHandlers>

<compilation debug="true" targetFramework="4.5">
  <assemblies>
    <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
    <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
    <add assembly="System.ServiceProcess, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
  </assemblies>
  <buildProviders>
    <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
  </buildProviders>
</compilation>

<httpRuntime targetFramework="4.5" />

并定义了Handler，如下所示

<system.webServer>
       <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </handlers>
  </system.webServer>

但我不知道为什么我会收到此错误。 它的解决方案是什么？