Create custom header when exporting RadGridView to PDF

Product Version	Product	Author
2019.2.618	RadGridView for WinForms	[Dimitar Karamfilov]

Problem

You want to have multiline text when exporting RadGridView to PDF. By default the header supports only one line.

Solution

Create a custom exporter and override the DrawHeader method. This way you can manually paint in the header area.

public class CustomGridViewPdfExport : GridViewPdfExport
{
    public CustomGridViewPdfExport(Telerik.WinControls.UI.RadGridView radGridView) : base(radGridView)
    {
    }

    protected override void DrawHeader()
    {
        System.Reflection.FieldInfo fi = typeof(GridViewPdfExport).GetField("editor", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
        PdfEditor editor = fi.GetValue(this) as PdfEditor;

        if (!this.ShowHeaderAndFooter)
        {
            return;
        }

        editor.SavePosition();
        editor.CreateMatrixPosition();
        editor.TranslatePosition(this.PageMargins.Left, this.PageMargins.Top);
        editor.SaveProperties();

        //specify the font for the first line
        this.HeaderFont = new System.Drawing.Font("Arial", 14f, FontStyle.Italic);
        editor.SetTextFontSize(this.HeaderFont.Size);
        editor.TrySetFont(this.HeaderFont.Name, this.HeaderFont.Style);
        //draw the first line
        editor.DrawText("First");

        editor.TranslatePosition(this.PageMargins.Left - 20, this.PageMargins.Top);
        //specify the font for the second line
        this.HeaderFont = new System.Drawing.Font("Verdana", 10f, FontStyle.Bold);
        editor.SetTextFontSize(this.HeaderFont.Size);
        editor.TrySetFont(this.HeaderFont.Name, this.HeaderFont.Style);
        //draw the second line
        editor.DrawText("Second");

        editor.RestoreProperties();
        editor.RestorePosition();
    }
}

Public Class CustomGridViewPdfExport
    Inherits GridViewPdfExport

    Public Sub New(ByVal radGridView As Telerik.WinControls.UI.RadGridView)
        MyBase.New(radGridView)
    End Sub

    Protected Overrides Sub DrawHeader()
        Dim fi As System.Reflection.FieldInfo = GetType(GridViewPdfExport).GetField("editor", System.Reflection.BindingFlags.NonPublic Or System.Reflection.BindingFlags.Instance)
        Dim editor As PdfEditor = TryCast(fi.GetValue(Me), PdfEditor)

        If Not Me.ShowHeaderAndFooter Then
            Return
        End If

        editor.SavePosition()
        editor.CreateMatrixPosition()
        editor.TranslatePosition(Me.PageMargins.Left, Me.PageMargins.Top)
        editor.SaveProperties()

        'specify the font for the first line
        Me.HeaderFont = New System.Drawing.Font("Arial", 14F, FontStyle.Italic)
        editor.SetTextFontSize(Me.HeaderFont.Size)
        editor.TrySetFont(Me.HeaderFont.Name, Me.HeaderFont.Style)
        'draw the first line
        editor.DrawText("First")

        editor.TranslatePosition(Me.PageMargins.Left - 20, Me.PageMargins.Top)
        'specify the font for the second line
        Me.HeaderFont = New System.Drawing.Font("Verdana", 10F, FontStyle.Bold)
        editor.SetTextFontSize(Me.HeaderFont.Size)
        editor.TrySetFont(Me.HeaderFont.Name, Me.HeaderFont.Style)
        'draw the second line
        editor.DrawText("Second")

        editor.RestoreProperties()
        editor.RestorePosition()
    End Sub
End Class