Telerik Reporting
Contents

Requirements

To export a report, you can use the RenderReport method of the ReportProcessor class. This method converts the contents of the report to a byte array in the specified format, which you can then use with other classes such as MemoryStream or FileStream .

The RenderReport method has two overloads, the first is used when rendering a single stream, the second when rendering multiple streams. The available extensions used as first argument of the RenderReport method are listed in the Rendering Extensions article.

Exporting a report to a single document format:

Some formats (MHTML, PDF, XLS(X), RTF, DOCX, PPTX, CSV) produce a single document which is handled by the first overload of the RenderReport:

Example

CopyC#
Telerik.Reporting.Processing.ReportProcessor reportProcessor = new Telerik.Reporting.Processing.ReportProcessor();

//set any deviceInfo settings if necessary
System.Collections.Hashtable deviceInfo = new System.Collections.Hashtable();

Telerik.Reporting.Processing.RenderingResult result = reportProcessor.RenderReport("PDF", report1, deviceInfo);
string fileName = result.DocumentName + "." + result.Extension;
const string path = @"C:\";
string filePath = System.IO.Path.Combine(path, fileName);

using (System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create))
{
    fs.Write(result.DocumentBytes, 0, result.DocumentBytes.Length);
}
CopyVB.NET
Dim reportProcessor As New Telerik.Reporting.Processing.ReportProcessor()

'set any deviceInfo settings if necessary
Dim deviceInfo As New System.Collections.Hashtable()

Dim result As Telerik.Reporting.Processing.RenderingResult = reportProcessor.RenderReport("PDF", report1, deviceInfo)
Dim fileName As String = result.DocumentName + "." + result.Extension
Const path As String = "C:\"
Dim filePath As String = System.IO.Path.Combine(path, fileName)

Using fs As New System.IO.FileStream(filePath, System.IO.FileMode.Create)
    fs.Write(result.DocumentBytes, 0, result.DocumentBytes.Length)
End Using
Note

When you export programmatically to XPS, you should use a separate STA thread which is required by the underlying WPF UI elements that we use to create the XAML representation of the report.

Exporting a report to a multi document format:

Some formats produce multiple files, for example HTML outputs all pages and related resources (images) in separate streams. In order to render a report in a non-single document format (HTML and IMAGE except TIFF) one should use the second RenderReport overload that accepts a CreateStream callback. For this example we're going to render to JPEG, but you can render a report in all graphic formats that GDI+ supports natively - this includes BMP, GIF, JPEG, PNG, TIFF and metafile (EMF). The Windows Forms Report Viewer uses internally metafile for rendering the reports for viewing, and TIFF for exporting. The rest of the formats are available only through code using the ReportProcessor.Render method where you should specify "IMAGE" as export format and the additional output format that is the actual graphic format - BMP, GIF, JPEG. Here is an example that renders a report as a JPEG image:

Example

CopyC#
System.Collections.Generic.List<System.IO.Stream> streams = new System.Collections.Generic.List<System.IO.Stream>();

public bool RenderReport(IReportDocument report)
{
    Telerik.Reporting.Processing.ReportProcessor reportProcessor = new Telerik.Reporting.Processing.ReportProcessor();
    string documentName = "";

    //specify the output format of the produced image.
    System.Collections.Hashtable deviceInfo = new System.Collections.Hashtable();
    deviceInfo["OutputFormat"] = "JPEG";

    bool result = reportProcessor.RenderReport("IMAGE", report, deviceInfo, this.CreateStream, out documentName);
    this.CloseStreams();

    return result;
}

void CloseStreams()
{
    foreach (System.IO.Stream stream in this.streams)
    {
        stream.Close();
    }
    this.streams.Clear();
}

System.IO.Stream CreateStream(string name, string extension, System.Text.Encoding encoding, string mimeType)
{
    const string path = @"C:\";
    string filePath = System.IO.Path.Combine(path, name + "." + extension);

    System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create);
    this.streams.Add(fs);
    return fs;
}
CopyVB.NET
Dim streams As New System.Collections.Generic.List(Of System.IO.Stream)()

Public Function RenderReport(report As IReportDocument) As Boolean
    Dim reportProcessor As New Telerik.Reporting.Processing.ReportProcessor()
    Dim documentName As String = ""

    'specify the output format of the produced image.
    Dim deviceInfo As New System.Collections.Hashtable()
    deviceInfo("OutputFormat") = "JPEG"

    Dim result As Boolean = reportProcessor.RenderReport("IMAGE", report, deviceInfo, AddressOf Me.CreateStream, documentName)
    Me.CloseStreams()

    Return result
End Function

Private Sub CloseStreams()
    For Each stream As System.IO.Stream In Me.streams
        stream.Close()
    Next
    Me.streams.Clear()
End Sub

Private Function CreateStream(name As String, extension As String, encoding As System.Text.Encoding, mimeType As String) As System.IO.Stream
    Const path As String = "C:\"
    Dim filePath As String = System.IO.Path.Combine(path, name + "." + extension)

    Dim fs As New System.IO.FileStream(filePath, System.IO.FileMode.Create)
    Me.streams.Add(fs)
    Return fs
End Function

See Also

Reference

RenderReport