动态设置ReportViewer

ReportViewer 我的ReportViewer在aspx页面上看起来像这样

<rsweb:ReportViewer ID="ReportViewer1" runat="server" Font-Names="Verdana"
                    Font-Size="8pt" Height="90%"
                    Width="100%" OnReportError="ReportViewer1_ReportError">
</rsweb:ReportViewer>

我的班级看起来像这样。

namespace S43G.CV
{
    [Serializable]
    public class CaseLoadForecastReportResultCV
    {
        public  Int64 M3Fe { get; set; }
        public  Int64 M3Grad { get; set; }
        public  Int64 M6Grad { get; set; }
        public  Int64 M12Grad { get; set; }
        public  Int64 Total { get; set; }
        public  Int64 GroupPart { get; set; }
        public  Int64 Year { get; set; }
    }
}

在代码隐藏中,我执行以下操作来运行ReportViewer

// get a list from db
List<CaseLoadForecastReportResultCV> answer = svyCaseBllHdl.GetCaseLoadForcastReport(userInput);    
// Reset the ReportViewer
ReportViewer1.Reset();
ReportViewer1.LocalReport.Dispose();
ReportViewer1.LocalReport.DataSources.Clear();

// build the Report Data Source
ReportDataSource rds = new ReportDataSource("S43G_CV_CaseLoadForecastReportResultCV", answer);

// set new values for ReportViewer
ReportViewer1.LocalReport.ReportPath = "S4_Reports/CaseLoadForecast.rdlc";
ReportViewer1.LocalReport.DataSources.Add(rds);
ReportViewer1.LocalReport.Refresh();

错误 我得到的信息如下:

尚未为数据源“CaseLoadForecasterReportResultCV”提供数据源实例。

任何帮助都会很好。