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    <p>You'd use a RUN inside of the RichTextBox, something like:</p> <pre><code>&lt;RichTextBox&gt; &lt;Run FontFamily="Arial"&gt;My Arial Content&lt;/Run&gt; &lt;Run FontFamily="Times" FontWeight="Bold"&gt;My bolded Times content&lt;/Run&gt; &lt;Run&gt;My Content that inherits Font From the RTB&lt;/Run&gt; &lt;/RichTextBox&gt; </code></pre> <p>Ok, This gets to play with some low-level doo hickies. But here we go:</p> <p>First, add a few ToggleButtons and a RichTextBox to a XAML Form. In the Rich Text Box, you'll give it a few Command Bindings in order to let the system know that everything works together.</p> <p>Here's the XAML:</p> <pre><code>&lt;RichTextBox Height="119" Name="RichTextBox1" Width="254" &gt; &lt;RichTextBox.CommandBindings&gt; &lt;CommandBinding Command="EditingCommands.ToggleBold" CanExecute="CommandBinding_CanExecute" &gt;&lt;/CommandBinding&gt; &lt;CommandBinding Command="EditingCommands.ToggleItalic" CanExecute="CommandBinding_CanExecute" &gt;&lt;/CommandBinding&gt; &lt;/RichTextBox.CommandBindings&gt; &lt;/RichTextBox&gt; &lt;ToggleButton MinWidth="40" Command="EditingCommands.ToggleBold" Height="23" HorizontalAlignment="Left" Name="Button1" VerticalAlignment="Top" Width="75" CommandTarget="{Binding ElementName=RichTextBox1}" &gt;Bold&lt;/ToggleButton&gt; &lt;ToggleButton MinWidth="40" Command="EditingCommands.ToggleBold" Height="23" HorizontalAlignment="Left" Name="Button2" VerticalAlignment="Top" Width="75" CommandTarget="{Binding ElementName=RichTextBox1}" &gt;Italics&lt;/ToggleButton&gt; </code></pre> <p>Now, what's there is a RichTextbox, and two toggle buttons, and the togglebuttons are related to the commandbindings to ToggleBold/ToggleItalics individually.</p> <p>In the CODE side, I have these two methods:</p> <pre><code>Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) End Sub Private Sub CommandBinding_CanExecute(ByVal sender As System.Object, ByVal e As System.Windows.Input.CanExecuteRoutedEventArgs) e.CanExecute = True End Sub </code></pre> <p>The BUTTON CLICK event handler is there because a button needs the event handler to be usable.</p> <p>The CanExecute tells the button if the value is available for bolding or not (for example, you could check the length, and not attempt to bold if the RTB is empty). </p> <p>Now, for really low-level control of things, you're going to have to be doing things in the RichTextFormat. Follow this <a href="http://www.devcity.net/PrintArticle.aspx?ArticleID=356" rel="nofollow noreferrer">link</a> to find out more about that. </p>
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    1. POHow can I change the FontFamily in a WPF RichTextBox without modifying previous text
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    1. USStephen Wrighton
    1. USStephen Wrighton
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    1. COI wanna change it dinamically , as well as commands do. This is fine for static text. But the poing in RichTextBox is dinamically yield text with different Text properties by keyboard entries.
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    2. COThen look into RTF, and reading/writing it. http://www.devcity.net/PrintArticle.aspx?ArticleID=356
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      1. USStephen Wrighton
    3. COThe issue is that the first <Run> and all the followings will inherit the textElement Properties from their container( which might be the FlowDocument behind the RichTextEditor), so when changing the Font of the Editor it changes the font of all elements referencing to it. So far I can manage that by subscribing PreviewKey down by generating new Run tags when changing the font but then I have to filter the keyboard Input. I'm sure there is a better way to do it, all EditingCommnads work doing the same with the bold,italic,fontSize, and of course the do it in a fancy way.
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