我有一个使用存储在数据库中的报告的 C# 应用程序,对于使用 XPObject 作为数据源(CptOperation 类,代码如下)的特定报告,我在尝试打印或预览时收到此错误消息:
分配给 DataSource 属性的对象不能用作报表的数据源,因为它不实现任何受支持的接口。有关详细信息,请参阅 http://help.devexpress.com/#XtraReports/CustomDocument1179
这是我用来打印报告的代码。
public static void PrintReport(string reportCode, object dataSource, string printerName)
{
using (var uow = new UnitOfWork { ConnectionString = Content.GlobalInfo.ServerConnectionString })
{
var report = uow.FindObject<Content.Report>(new BinaryOperator("Code", reportCode));
if (report == null)
{
XtraMessageBox.Show(String.Format("The report {0} is not found", reportCode),
Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
var xtraReport = getXtraReportFromReport(report);
xtraReport.DataSource = dataSource;
if (!String.IsNullOrEmpty(printerName))
xtraReport.Print(printerName);
else
xtraReport.Print();
}
}
private static XtraReport getXtraReportFromReport(Content.Report report)
{
XtraReport xtraReport;
using (var writer = new StreamWriter(new MemoryStream()))
{
writer.Write(report.Content);
writer.Flush();
xtraReport = XtraReport.FromStream(writer.BaseStream, true);
}
return xtraReport;
}
这是我的对象持久性类“CptOperation”:
private CptTypeOperation cptTypeOperation;
public CptTypeOperation CptTypeOperation
{
get { return cptTypeOperation; }
set { SetPropertyValue<CptTypeOperation>("CptTypeOperation", ref cptTypeOperation, value); }
}
private int numero;
public int Numero
{
get { return numero; }
set { SetPropertyValue<int>("Numero", ref numero, value); }
}
private CptSession cptSession;
[Association("CptSession-CptOperation")]
public CptSession CptSession
{
get { return cptSession; }
set { SetPropertyValue<CptSession>("CptSession", ref cptSession, value); }
}
[Association("CptOperation-Piece")]
public XPCollection<Piece> Pieces
{
get { return GetCollection<Piece>("Pieces"); }
}
[Association("CptOperation-Transact")]
public XPCollection<Transact> Transacts
{
get { return GetCollection<Transact>("Transacts"); }
}