Error when creating crystal report in asp.net mvc2

问题

I made a report using crystal report and in the page load I am writing this

protected void Page_Load(object sender, EventArgs e)
    {
        ReportDocument crystalReport = new ReportDocument();
        crystalReport.Load(Server.MapPath("CrystalReport.rpt"));
        crystalReport.SetDatabaseLogon
            ("amit", "password", @"AMIT\SQLEXPRESS", "TestDB");
        CrystalReportViewer1.ReportSource = crystalReport;
    }

and when runing the page I found this error.

CS0433: The type 'CrystalDecisions.Web.CrystalReportViewer' exists in both 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web\10.5.3700.0__692fbea5521e1304\CrystalDecisions.Web.dll' and 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web\13.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll'

回答1:

I found this tag in my web.config

<add assembly="CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>

and in my aspx page

<%@ Register Assembly="CrystalDecisions.Web,  Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"
    Namespace="CrystalDecisions.Web" TagPrefix="CR" %>

different version for the same assembly makes the conflict so I removed web.config tag and it runs very smooth.

thanks.

回答2:

Copy-paste this (Version=13.0.2000.0) from web config to the default ASPX source code where you found different versions of Crystal Report and the error will be fixed.

来源：https://stackoverflow.com/questions/4736803/error-when-creating-crystal-report-in-asp-net-mvc2