My first purpose to handle with Microsoft Reporting Service error and output custom message with help of ReportErrorEventHandler. See more on msdn about
ReportErrorEventHandler.
To test it I have created ASP.net Empty Web Site in Visual Studio 2017 (.NET Framework 4.6.1). Added masterpage ReportViewer.aspx, code behind page ReportViewer.aspx.cs, config file Web.Config.
Registered two assemblies ReportingServicesWebServer and Microsoft.ReportViewer.WebForms
<%@ Register assembly="ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.ReportingServices.WebServer" TagPrefix="RS"%><%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>
because default Microsoft Reporting Services page contains RS:ReportViewerHost user control which requires ReportingServicesWebServer assembly, and ReportErrorEventHandler requires Microsoft.ReportViewer.WebForms according to msdn article mentioned above.
As a result a get an error
The type 'ReportErrorEventArgs' exists in both 'Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' and 'ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' ReportViewer.aspx.cs
When I'm trying to use namespace Microsoft.ReportingServices.WebServer instead of Microsoft.Reporting.WebForms, it tells me
The type or namespace name 'ReportErrorEventArgs' could not be found (are you missing a using directive or an assembly reference?) ReportViewer.aspx.cs
Also I didn't find how to use alias for references to use specific assembly, because there is noreference section in my solution explorer.
How could I hold both assemblies and get rid of an error. Thanks in advance!
ReportViewer.aspx.cs code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Microsoft.Reporting.WebForms
{
public partial class ReportViewer1 : System.Web.UI.Page
{
public void ReportErrorEventHandler(object sender, ReportErrorEventArgs e)
{
Exception ex = e.Exception;
ReportErrorMessage.Text = ex.Message;
while (ex.InnerException != null)
{
ex = ex.InnerException;
ReportErrorMessage.Text = ReportErrorMessage.Text + ex.Message;
}
ReportErrorMessage.Visible = true;
if (ReportErrorMessage.Text.Contains("rsErrorOpeningConnection"))
{
ReportErrorMessage.Text = "The database is under everyday maintanence now. Please try again in 20 minutes.";
}
e.Handled = true;
}
}
}ReportViewer.aspx code:
<%@ Register assembly="ReportingServicesWebServer, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.ReportingServices.WebServer" TagPrefix="RS"%><%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=14.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %><%@ Page Language="C#" AutoEventWireup="true" CodeFile="ReportViewer.aspx.cs" Inherits="Microsoft.Reporting.WebForms.ReportViewer1" EnableEventValidation="false" %><!DOCTYPE html><script runat="server"></script><html><head><meta charset="utf-8" /><title></title></head><body><form id="ReportViewerForm" runat="server"><asp:scriptmanager runat="server"></asp:scriptmanager><asp:label runat="server" id="ReportErrorMessage" Visible="false"></asp:label><table cellspacing="0" cellpadding="0" width="100%" height="100%"><tr height="100%"><td width="100%"><rsweb:ReportViewer ID="ReportViewerControl" runat="server" ProcessingMode="Remote" Height="100%" Width="100%" OnReportError="ReportErrorEventHandler"><ServerReport ReportPath="<ReportPath>" ReportServerUrl="<URL>" /></rsweb:ReportViewer></td></tr></table></form></body></html>
Note that ReportViewer.aspx does not contains RS:ReportViewerHost user control, but contains rsweb:ReportViewer, because it is test project. And if remove ReportingServicesWebServerassembly it will work as expected. But production web page requires both assemblies, ReportingServicesWebServer for RS:ReportViewerHost user control and Microsoft.ReportViewer.WebForms to use ReportErrorEventHandler.