Native Print Error

[Jaco De Villiers]

Hi,

I am getting an error when I try to print a RichTextBox in native mode.  The Error is "Dialogs must be user initiated.  If I Use Mode=Html then it works but the document prints incorrectly.  When I export to PDF it works and prints correctly.  See code in viewmodel below, I have also tried the dispatcher associated with the RichTextBox.  The RichTextBox is close to the root of the visual tree, but has a height of 0px.  It Throws the exception on line "rtb.Print( package.Name, Telerik.Windows.Documents.UI.PrintMode.Native ); ".  I have also tried to execute the "CreateDocument". Without dispatching on the UI thread explicitly

Please Help
Jaco

/// <summary>
/// Prints the specified package.
/// </summary>
/// <param name="package">The package.</param>
public void Print(PMPackage package, RadRichTextBox rtb)
{
    GalaSoft.MvvmLight.Threading.DispatcherHelper.UIDispatcher.BeginInvoke((Action)(() =>
    {
        rtb.Document = CreateDocument(package);
    }));
    rtb.Print(package.Name, Telerik.Windows.Documents.UI.PrintMode.Native);
}

[Rajmund]

I have the same problem, it was:  dialog must be user initiated exception (not used dispatcher - too long time for creating document), or  nullreferenceexception (with dispatcher).
I solved this problem by added line before create document:

rtb.Document.Measure(RadDocument.MAX_DOCUMENT_SIZE);

In telerik examples this line is only in Export method and that method working correctly :)

[Jaco De Villiers]

Worked like a charm!