System.NullReferenceException

[Heiko]

I try to bind a RadRichTextBox via DocxDataProvider to a byte buffer in my ViewModel. However I run into a NullReferenceException. This happens during initialization (Docx property, BindingState: UpdatingSource) before any relevant part of my code is executed.

This is how I set up the DocxDataProvider:

<telerikDocx:DocxDataProvider x:Name="docxProvider"
                      Docx="{Binding Buffer, Mode=TwoWay}"
                      RichTextBox="{Binding ElementName=radRichTextBox}"
                      SetupDocument="docxProvider_OnSetupDocument">
</telerikDocx:DocxDataProvider>

The Buffer is defined as:

private byte[] _buffer;
public byte[] Buffer
{
    get
    {
        return this._buffer;
    }
    set
    {
        this._buffer = value;
        this.RaisePropertyChanged(() => Buffer);
    }
}

I just load the view, set the DataContext to my ViewModel and that's all. When I set a breakpoint on the binding expression I can see that "Buffer" has the value of byte[0]. StackTrace says this happens at Telerik.Windows.Documents.FormatProviders.BinaryDataProviderBase.UpdateBytes()

I am really stuck with this problem and don't know how to solve it.

Regards
Neils

[Petya]

Hello Neils,

I am not sure what might be the problem. Please find attached a project demonstrating how binding can be implemented using DocxDataProvider.

In case this does not help, please share some more details on your setup or even better, open a support ticket and send us a sample project we can use for troubleshooting.

Let us know how it goes.

All the best,
Petya
the Telerik team