报表查看器不显示窗口

Question

我在这里遇到报告查看器的一些问题。
它不显示报表查看器，我真的很 不知道是什么问题。

这是我的代码

private ServerReport LoadReportViewer()
        {
            ReportViewer.ProcessingMode = ProcessingMode.Remote;
            ServerReport serverReport = ReportViewer.ServerReport;
            serverReport.ReportServerUrl = new Uri(ConfigurationManager.AppSettings["ReportServerURL"]);
            serverReport.ReportPath = ConfigurationManager.AppSettings["ReportServerPath"];
            var paramList = new List<ReportParameter>();
            paramList.Add(new ReportParameter("ID", ID.ToString(), false));
            paramList.Add(new ReportParameter("UserID", UserID.ToString(), false));

            ReportViewer.ServerReport.SetParameters(paramList);
            ReportViewer.ServerReport.Refresh();
            return serverReport;
        }

ASPX

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

<rsweb:ReportViewer ID="ReportViewer" runat="server" Width="100%" Height="90%" ShowExportControls="False"></rsweb:ReportViewer>