Classe LocalReport

Article
08/23/2008

Represents a report that is processed and rendered locally without connecting to a report server.

Espace de noms: Microsoft.Reporting.WebForms
Assembly: Microsoft.ReportViewer.WebForms (dans microsoft.reportviewer.webforms.dll)

Syntaxe

Notes

The LocalReport class represents reports that are processed and rendered locally without connecting to a report server. This class is the same object that is used by the ReportViewer control, but it also can be used independently as a non-visual object that encapsulates the core functionality of the ReportViewer control.

The LocalReport object can open client report definition (RDLC) files from the file system, or the RDLC file can be supplied to it as a Stream or a TextReader.

The LocalReport object does not have the ability to execute queries or fetch data; instead data must be supplied to it as instances of ADO.NET DataTables or as a collection of business objects.

The LocalReport object supports report parameters, but does not support query parameters.

Important

In contrast to the Windows Forms version of the ReportViewer control, the WebForm version does not support changing the report definition after it has been rendered. To change the report definition, you will have to create a new instance of the ReportViewer control.

Exemple

In the following code example, a LocalReport object is used to load and export a report.

protected void Button1_Click(object sender, EventArgs e)
{

   Microsoft.Reporting.WebForms.LocalReport lr = 
     new Microsoft.Reporting.WebForms.LocalReport();

   string deviceInfo =
     "<DeviceInfo>" +
     "<SimplePageHeaders>True</SimplePageHeaders>" + 
     "</DeviceInfo>";

   lr.ReportPath = @"C:\My Reports\Monthly Sales.rdlc";

   lr.DataSources.Add(new ReportDataSource("Sales", GetSalesData()));

   byte[] bytes = lr.Render("Excel", deviceInfo, out mimeType, 
     out encoding, out streamids, out warnings);

      using (FileStream fs = new FileStream(@"c:\My Reports\Monthly Sales.xls", FileMode.Create))
      {
        fs.Write(bytes, 0, bytes.Length);
        fs.Close();
      }
}

Protected Sub Button1_Click(ByVal sender As Object, _
   ByVal e As System.EventArgs) Handles Button1.Click
   Dim warnings As Warning() = Nothing
   Dim streamids As String() = Nothing
   Dim mimeType As String = Nothing
   Dim encoding As String = Nothing
   Dim extension As String = Nothing
   Dim deviceInfo as string
   Dim bytes As Byte()

   Dim lr As New Microsoft.Reporting.WebForms.LocalReport

   lr.ReportPath = "C:\My Reports\Monthly Sales.rdlc"

   lr.DataSources.Add(New ReportDataSource("Sales", GetSalesData()))

   deviceInfo = _
"<DeviceInfo><SimplePageHeaders>True</SimplePageHeaders></DeviceInfo>"

   bytes = ReportViewer1.LocalReport.Render("Excel", deviceInfo,_
      mimeType, encoding, extension, streamids, warnings)

   Dim fs As New FileStream("c:\output.xls", FileMode.Create)
   fs.Write(bytes, 0, bytes.Length)
   fs.Close()

End Sub

Hiérarchie d'héritage

System.Object
Microsoft.Reporting.WebForms.Report
Microsoft.Reporting.WebForms.LocalReport

Sécurité des threads

Tous les membres publics statiques (Partagés dans Visual Basic) de ce type sont thread-safe. Il n'est pas garanti que les membres d'instance soient thread-safe.

Voir aussi

Référence

Membres LocalReport
Espace de noms Microsoft.Reporting.WebForms

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