I have a C# application that use reports stored in a database, and for a particular report, that use a XPObject as datasource (CptOperation class, the code is below), I have this error message when trying to print or preview :
An object assigned to the DataSource property cannot be used as a report's datasource, because it does not implement any of supported interfaces. For more information, refer to http://help.devexpress.com/#XtraReports/CustomDocument1179
Here is the code I use to print my report.
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;
}
Here is my object persistance class "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"); }
}
The problem occues because I was sending an object of type XPObject
as the report datasource, but in fact, the xtraReport datasource must be a IList
or IList<T>
object, for example, it can be of type : XPCollection<CptOperation>
or List<CptOperation>
...