Wpf RichTextBox paragraph spacing 段落间距和行高 height

<RichTextBox Margin="0,51,0,0" Name="mainTextBox" > <RichTextBox.Resources> <Style TargetType="{x:Type Paragraph}"> <Setter Property="Margin" Value="0"/> <Setter Property="LineHeight" Value="20"/> </Style> </RichTextBox.Resources> </RichTextBox> 代码