Bind the text of RichTextBox from Xaml

Question

How to Bind the text of RichTextArea from xaml

Answer 1

They've got the easier answer here:

Silverlight 4 RichTextBox Bind Data using DataContext and it works like a charm.

<RichTextBox>
  <Paragraph>
    <Run Text="{Binding Path=LineFormatted}" />
  </Paragraph>
</RichTextBox>

Answer 2

Here is the solution I came up with. I created a custom RichTextViewer class and inherited from RichTextBox.

using System.Windows.Documents;
using System.Windows.Markup;
using System.Windows.Media;

namespace System.Windows.Controls
{
    public class RichTextViewer : RichTextBox
    {
        public const string RichTextPropertyName = "RichText";

        public static readonly DependencyProperty RichTextProperty =
            DependencyProperty.Register(RichTextPropertyName,
                                        typeof (string),
                                        typeof (RichTextBox),
                                        new PropertyMetadata(
                                            new PropertyChangedCallback
                                                (RichTextPropertyChanged)));

        public RichTextViewer()
        {
            IsReadOnly = true;
            Background = new SolidColorBrush {Opacity = 0};
            BorderThickness = new Thickness(0);
        }

        public string RichText
        {
            get { return (string) GetValue(RichTextProperty); }
            set { SetValue(RichTextProperty, value); }
        }

        private static void RichTextPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            ((RichTextBox) dependencyObject).Blocks.Add(
                XamlReader.Load((string) dependencyPropertyChangedEventArgs.NewValue) as Paragraph);

        }
    }
}