The Report Viewer Web Control HTTP Handler has not been registered in the application's 
web.config file.  Add <add verb="*" path="Reserved.ReportViewerWebControl.axd" type = 
"Microsoft.Reporting.WebForms.HttpHandler,Microsoft.ReportViewer.WebForms,Version=9.0.0.0,Culture=neutral,PublicKeyToken=b03f5f7f11d50a3a" /> to the system.web/httpHandlers section of the web.config file

这个错误即将到来.我已经在http处理程序中提到了这一行,但仍然收到此错误

<add path="Reserved.ReportViewerWebControl.axd" verb="*"   type="Microsoft.Reporting.WebForms.HttpHandler,Version=8.0.0.0,PublicKeyToken=0000000000000000" validate="false" />

我的html页面标记如下

<%@ Register Assembly="Microsoft.ReportViewer.WebForms,PublicKeyToken=b03f5f7f11d50a3a"
    Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Button ID="btnsubmit" runat="server" OnClick="GenerateReportButton_Click" />
    <rsweb:ReportViewer ID="ReportViewer1" runat="server">
    </rsweb:ReportViewer>
</asp:Content>

Web配置程序集部分如下：

<assemblies>
    <add assembly="System.Core,Version=3.5.0.0,PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Web.Extensions,PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Data.DataSetExtensions,PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Xml.Linq,PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Web.DataVisualization,PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Windows.Forms,Version=2.0.0.0,PublicKeyToken=B77A5C561934E089"/>
    <add assembly="Microsoft.ReportViewer.WebForms,PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="Microsoft.ReportViewer.Common,PublicKeyToken=B03F5F7F11D50A3A"/>
</assemblies>