asp.net中的rdlc報告問題

Question

 private void btnGenerate_Click(object sender, EventArgs e)
        {
            try
            {
                if (Convert.ToDateTime(dateTimeTo.Text).Date >= Convert.ToDateTime(dateTimeFrom.Text).Date)
                {
                    DateTime today = DateTime.Today.Date;
                    reportViewer1.RefreshReport();
                    reportViewer1.LocalReport.Refresh();
                    DataTable dtnew = new DataTable();
                    string EmpId = null;

                    if (ddlEmployee.SelectedIndex > 0)
                    {
                        EmpId = ddlEmployee.SelectedValue.ToString();
                    }

                    reportViewer1.LocalReport.DataSources.Clear();
                    dtnew = new dbInOutTimeDatasetTableAdapters.InOutTableAdapter().GetData(Convert.ToDateTime(dateTimeTo.Text), Convert.ToDateTime(dateTimeFrom.Text),new Guid(EmpId));
                    //   dtnew = new dsReportTableAdapters.ReportTableAdapter().GetData(Convert.ToDateTime(dateTimeFrom.Text), Convert.ToDateTime(dateTimeTo.Text), EmpId, DeptId);

                    reportViewer1.Visible = true;
                    ReportDataSource rptds = new ReportDataSource("dbInOutTimeDataset_ReportInOut", dtnew);
                    reportViewer1.LocalReport.DataSources.Add(rptds);
                    reportViewer1.LocalReport.Refresh();
                    reportViewer1.RefreshReport();
                    reportViewer1.Visible = true;
                }
                else
                {
                    MessageBox.Show("To date must be greater or equal to From date.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

            }
            catch (InvalidOperationException exI)
            {
                MessageBox.Show("There is no any Employee Absent.", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Unhandled Error:" + ex.Message);
            }
        }

問題：無法在Reportviewer中綁定報表。 我在“ dtnew”中獲得了記錄，但是在我的應用程序中看不到該報告

報告中出現錯誤“尚未為數據源'dsInOutReport_InOut'提供數據源實例“

Answer 1

添加：

reportViewer1.LocalReport.DataSources.clear();

在這之前：

reportViewer1.LocalReport.DataSources.Add(rptds);

這將起作用。