3
我已经创建了一个winform,供用户查看查看我为他们创建的许多报告。我有一个下拉列表与报告名称触发适当的领域来显示参数。一旦这些填充完毕,他们按提交并出现报告。这是他们第一次点击屏幕。他们可以更改参数,ReportViewer可以正常工作。切换到不同的报表,而我得到以下的ReportViewer错误:在WinForms的ReportViewer中切换数据源
An error occurred during local report processing.
An error has occurred during the report processing.
A data source instance has not been supplied for the data source "CgTempData_BusMaintenance".
至于我在使用的过程:
- 我设置
reportName
(串)的物理RDLC名。 - 我将
dataSource
(字符串)设置为数据源名称 - 我使用要运行的报表的数据填充通用DataTable。
- 制作中的ReportViewer可见
- 设置
LocalReport.ReportPath = "Reports\\" = reportName;
- 清除
LocalReport.DataSources.Clear()
- 添加新
LocalReport.DataSources.Add(new ReportDataSource(dataSource, dt));
RefreshReport()
上的ReportViewer。
这里是设置并显示的ReportViewer的代码部分:
/// <summary>
/// Builds the report.
/// </summary>
private void BuildReport()
{
DataTable dt = null;
ReportingCG rcg = new ReportingCG();
if (reportName == "GasUsedReport.rdlc")
{
dataSource = "CgTempData_FuelLog";
CgTempData.FuelLogDataTable DtFuelLog = rcg.BuildFuelUsedTable(fromDate, toDate);
dt = DtFuelLog;
}
else if (reportName == "InventoryCost.rdlc")
{
CgTempData.InventoryUsedDataTable DtInventory;
dataSource = "CgTempData_InventoryUsed";
DtInventory = rcg.BuildInventoryUsedTable(fromDate, toDate);
dt = DtInventory;
}
else if (reportName == "VehicleMasterList.rdlc")
{
dataSource = "CgTempData_VehicleMaster";
CgTempData.VehicleMasterDataTable DtVehicleMaster = rcg.BuildVehicleMasterTable();
dt = DtVehicleMaster;
}
else if (reportName == "BusCosts.rdlc")
{
dataSource = "CgTempData_BusMaintenance";
dt = rcg.BuildBusCostsTable(fromDate, toDate);
}
// Setup the DataSource
this.reportViewer1.Visible = true;
this.reportViewer1.LocalReport.ReportPath = "Reports\\" + reportName;
this.reportViewer1.LocalReport.DataSources.Clear();
this.reportViewer1.LocalReport.DataSources.Add(new ReportDataSource(dataSource, dt));
this.reportViewer1.RefreshReport();
}
任何想法如何删除所有剩余的旧数据的?我是否处理该对象并重新创建它?