如何在WPF RichTextBox中设置字距间距？

Question

I cannot find how to set horizontal character spacing in a RichTextBox.

Hello, World! H ello , W orld !

---

I can only set vertical Line Height using C#.

Paragraph p = new Paragraph();
p.LineHeight = 50;

rtb1.Document = new FlowDocument(p);

p.Inlines.Add(new Run("Hello, World!"));

And outer margin with XAML.

<RichTextBox x:Name="rtb1" 
       HorizontalAlignment="Left"
       Height="600"
       Width="300" 
       Margin="188,61,0,0" 
       VerticalAlignment="Top">
     <RichTextBox.Resources>
         <Style TargetType="{x:Type Paragraph}">
             <Setter Property="Margin" Value="50"/>
         </Style>
     </RichTextBox.Resources>
 </RichTextBox>

Answer 1

The most common options you have are:

• Control.FontStretch
• Glyphs

but here on SO a user found a nice (although potentially performance intensive) alternative to both (read the accepted answer):

How can I specify letter spacing or kerning, in a WPF TextBox?