Adding text in a new line in WPF RichTextBox at runtime

Question

I want to add some text in a WPF RichTextBox at runtime in a new line. I can do this using:

FlowDocument mcFlowDoc = new FlowDocument();
mcFlowDoc = richTextBox.Document;
Paragraph pr = new Paragraph();
pr.Inlines.Add(status);
mcFlowDoc.Blocks.Add(pr);
StatusText.Document = mcFlowDoc;

But there is too much of a gap between two lines. How can I fix this?

Answer 1

To avoid having to manually set the margin for every paragraph, you can add this to the RichTextBox's XAML:

<RichTextBox>
  <RichTextBox.Resources>
    <Style TargetType="{x:Type Paragraph}">
      <Setter Property="Margin" Value="0"/>
    </Style>
  </RichTextBox.Resources>
</RichTextBox>

Answer 2

Try pr.Margin = new Thickness(0.0) to remove the gaps between paragraphs.

Answer 3

According to the documentation, Paragraph spacing is defined by margins, which do not accumulate (no doubling up), so Julien Lebosquain's answer is correct.

MSDN on FlowDocument Paragraph Spacing