How Can I Simplify Data Binding in a WPF RichTextBox?

Simplified WPF RichTextBox data binding

Data binding for WPF RichTextBox can be tricky. However, there is an easier alternative.

Additional DocumentXaml properties

Instead of inheriting from RichTextBox, you can create an additional DocumentXaml attribute that allows you to bind directly to the RichTextBox's document content. The implementation is as follows:

public static class RichTextBoxHelper
{
    public static string GetDocumentXaml(DependencyObject obj) =>
        (string)obj.GetValue(DocumentXamlProperty);

    public static void SetDocumentXaml(DependencyObject obj, string value) =>
        obj.SetValue(DocumentXamlProperty, value);

    public static readonly DependencyProperty DocumentXamlProperty =
        DependencyProperty.RegisterAttached(
            "DocumentXaml", typeof(string), typeof(RichTextBoxHelper),
            new FrameworkPropertyMetadata
            {
                BindsTwoWayByDefault = true,
                PropertyChangedCallback = (obj, e) =>
                {
                    var richTextBox = (RichTextBox)obj;
                    var doc = new FlowDocument();

                    var xaml = GetDocumentXaml(richTextBox);
                    var range = new TextRange(doc.ContentStart, doc.ContentEnd);
                    range.Load(new MemoryStream(Encoding.UTF8.GetBytes(xaml)),
                        DataFormats.Xaml);

                    richTextBox.Document = doc;

                    range.Changed += (obj2, e2) =>
                    {
                        if (richTextBox.Document == doc)
                        {
                            using var buffer = new MemoryStream();
                            range.Save(buffer, DataFormats.Xaml);
                            SetDocumentXaml(richTextBox,
                                Encoding.UTF8.GetString(buffer.ToArray()));
                        }
                    };
                }
            });
}

Usage:

<TextBox Text="{Binding FirstName}"></TextBox>
<TextBox Text="{Binding LastName}"></TextBox>
<RichTextBox local:RichTextBoxHelper.DocumentXaml="{Binding Autobiography}"></RichTextBox>

This additional attribute allows you to easily bind RichTextBox's document to a data model property. The code handles parsing the XAML content into FlowDocument and updating the binding when the document changes.

Advantages of XamlPackage format:

The XAML package format has advantages over plain XAML, such as the inclusion of images and greater flexibility. Consider using XamlPackage for your data binding needs.

Conclusion:

Using the attached DocumentXaml attribute provides a straightforward way to do data binding of RichTextBox in WPF. Simplify your RichTextBox control's data binding needs with this solution.

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