LocalReport.SetParameters异常尝试设置报告参数'ParameterName'，这个报告中没有定义

Question

我有两个按钮（button1，button2） 这两个按钮打开两个相同的报告，除了report2.rdlc有一个字符串参数

如果我按下按钮1个第一消息框中显示参数计数= 0（如预期），我得到在reportviewer1 report1.rdlc显示如果然后我按下按钮2个消息框中显示参数计数= 0再次（我期望它显示1），我得到LocalProcessingException {“试图设置报表参数'Report2ParameterString'是本报告中没有定义。“}

如果我按下BUTTON2第一消息框中显示参数计数= 1（如预期）和我得到在reportviewer1 显示报告2如果然后我按下按钮1 消息框中显示参数计数= 1再次（我希望它显示0）加载新的R之前，我得到report1.rdlc显示在reportviewer1没有例外

我的代码是

private void report1Button_Click(object sender, EventArgs e) 
    { 
     reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report1.rdlc"; 
     MessageBox.Show("parameters count =" + reportViewer1.LocalReport.GetParameters().Count.ToString()); 
     reportViewer1.LocalReport.DataSources.Clear(); 
     reportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", reportDataTable)); 
     reportViewer1.RefreshReport(); 
    } 
    private void report2Button_Click(object sender, EventArgs e) 
    { 
     reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report2.rdlc"; 
     MessageBox.Show("parameters count =" +reportViewer1.LocalReport.GetParameters().Count.ToString()); 
     reportViewer1.LocalReport.SetParameters(new ReportParameter("Report2ParameterString", " testing Report2ParameterString")); 
     reportViewer1.LocalReport.DataSources.Clear(); 
     reportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", reportDataTable)); 
     reportViewer1.RefreshReport(); 
    } 

Answer 1

呼叫ReportViewer.Reset()扩展端口。

例如：

reportViewer1.Reset(); 
reportViewer1.LocalReport.ReportPath = Application.StartupPath + "\\report2.rdlc"; 
...