c# - 查询reportViewer从表单中取参数

Question

我对使用ReportViewer. 我有一个问题，我不知道如何解决。

我有一个 DateTextBox和一个 Location TextBox。我的问题是，当用户键入日期和位置时，如何在ReportViewer. 下面是一些截图，以便更好地理解。任何帮助将不胜感激。

如果需要更多详细信息，请告诉我。

Answer 1

我假设您将ShowButton在表单中添加一个按钮。但是，您可以使用 TextBox 事件（例如 Focus Lost、Text Changed 等）而不是按钮单击事件。

   private void ShowButton_Click(object sender, EventArgs e)
    {
        DateTime allocationDate = Convert.ToDateTime(allocDateTextBox.Text);
        string   locationName   = locationTextBox.Text;

        //You can create as many datasources matching the name of DataSet in your report
        ReportDataSource rds = new ReportDataSource("DataSet1");
        rds.Value = getData(String.Format("Select * from myTable where theDate={0} AND Location={1}", allocationDate, locationName));

        reportViewer1.LocalReport.DataSources.Clear();

        //add as many datasources created above
        reportViewer1.LocalReport.DataSources.Add(rds);
        reportViewer1.RefreshReport();
    }

   private DataTable getData(string query)
   {
      //Select new record from database based on the new query with the new criteria
      //return the record as DataTable, DataSet or Collection of object
   }