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    <p>There is a much easier way!</p> <p>You can easily create an attached <code>DocumentXaml</code> (or <code>DocumentRTF</code>) property which will allow you to bind the RichTextBox's document. It is used like this, where Autobiography is a string property in your data model:</p> <pre><code>&lt;TextBox Text="{Binding FirstName}" /&gt; &lt;TextBox Text="{Binding LastName}" /&gt; &lt;RichTextBox local:RichTextBoxHelper.DocumentXaml="{Binding Autobiography}" /&gt; </code></pre> <p>Voila! Fully bindable RichTextBox data!</p> <p>The implementation of this property is quite simple: When the property is set, load the XAML (or RTF) into a new FlowDocument. When the FlowDocument changes, update the property value.</p> <p>This code should do the trick:</p> <pre><code>using System.IO; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; public class RichTextBoxHelper : DependencyObject { public static string GetDocumentXaml(DependencyObject obj) { return (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) =&gt; { var richTextBox = (RichTextBox)obj; // Parse the XAML to a document (or use XamlReader.Parse()) var xaml = GetDocumentXaml(richTextBox); var doc = new FlowDocument(); var range = new TextRange(doc.ContentStart, doc.ContentEnd); range.Load(new MemoryStream(Encoding.UTF8.GetBytes(xaml)), DataFormats.Xaml); // Set the document richTextBox.Document = doc; // When the document changes update the source range.Changed += (obj2, e2) =&gt; { if(richTextBox.Document==doc) { MemoryStream buffer = new MemoryStream(); range.Save(buffer, DataFormats.Xaml); SetDocumentXaml(richTextBox, Encoding.UTF8.GetString(buffer.ToArray())); } }; }}); } </code></pre> <p>The same code could be used for TextFormats.RTF or TextFormats.XamlPackage. For XamlPackage you would have a property of type byte[] instead of string.</p> <p>The XamlPackage format has several advantages over plain XAML, especially the ability to include resources such as images, and it is more flexible and easier to work with than RTF.</p> <p>It is hard to believe this question sat for 15 months without anyone pointing out the easy way to do this.</p>
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    1. USRay Burns
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    1. CO+1 for this great solution to the problem! Thanks.
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      1. USDavid Veeneman
    2. COIf you have multiple RichTextBoxes on the same window, this solution will not work.
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      1. USKelly
    3. CO@Kelly, use DataFormats.Rtf, this can solve multiple richtextboxes issue.
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      1. USCharlieShi
 

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