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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