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    copied!<p>Alright, I've come up with a solution that works for my case - but may not work for everyone who wants something like this. It's messy, but it does the job.</p> <p>I'm not going to accept my own answer for a few days, just in case someone else has a better way of accomplishing this.</p> <p>Here we go, first, the XAML:</p> <pre><code>&lt;Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="500" Width="600"&gt; &lt;DockPanel LastChildFill="True"&gt; &lt;RichTextBox x:Name="rtb" FontFamily="Courier New" FontSize="14" PreviewKeyDown="rtb_PreviewKeyDown"&gt; &lt;FlowDocument&gt; &lt;Paragraph&gt; &lt;InlineUIContainer Unloaded="InlineUIContainer_Unloaded"&gt; &lt;TextBlock FontFamily="Courier New" FontSize="14"&gt;This line of text is not editable.&lt;/TextBlock&gt; &lt;/InlineUIContainer&gt; &lt;Run Foreground="Blue"&gt;But this is editable.&lt;/Run&gt; &lt;/Paragraph&gt; &lt;/FlowDocument&gt; &lt;/RichTextBox&gt; &lt;/DockPanel&gt; &lt;/Window&gt; </code></pre> <p>And the code behind:</p> <pre><code>using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void InlineUIContainer_Unloaded(object sender, RoutedEventArgs e) { (sender as InlineUIContainer).Unloaded -= new RoutedEventHandler(InlineUIContainer_Unloaded); TextBlock tb = new TextBlock(); tb.FontFamily = new FontFamily("Courier New"); tb.FontSize = 14; tb.Text = "This line of text is not editable."; TextPointer tp = rtb.CaretPosition.GetInsertionPosition(LogicalDirection.Forward); InlineUIContainer iuic = new InlineUIContainer(tb, tp); iuic.Unloaded += new RoutedEventHandler(InlineUIContainer_Unloaded); } private void rtb_PreviewKeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.Enter) { var newPointer = rtb.Selection.Start.InsertLineBreak(); rtb.Selection.Select(newPointer, newPointer); e.Handled = true; } } } } </code></pre> <p>My solution relies on the fact that when an <code>InlineUIContainer</code> is removed from the UI, it's <code>Unloaded()</code> method is called. At that point, I simply reinsert the deleted <code>InlineUIContainer</code> at the current caret position.</p> <p>As with any hack, there are a bunch of disadvantages. The disadvantages I'm finding are the following:</p> <ul> <li>The text I want to be read-only needs to be wrapped in a <code>InlineUIContainer</code>. That is a little limiting for this solution.</li> <li>I have to capture the 'Enter' key and insert line breaks manually, otherwise, <code>InlineUIContainer.Unloaded()</code> keeps firing everytime the Enter key is pressed. Not fun, but it works for my case.</li> </ul> <p>It's not a great solution, but I think it will work for me. Like I said, I'm not going to mark this as an answer to my own question yet - hopefully someone else will have a better way of doing this.</p>
 

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