<RichTextBox Name="rtbTest" >
<!--设置行间距-->
<RichTextBox.Document>
<FlowDocument Focusable="True" LineHeight="1">
</FlowDocument>
</RichTextBox.Document>
</RichTextBox>
<RichTextBox Name="rtbTest" >
<!--设置行间距-->
<RichTextBox.Document>
<FlowDocument Focusable="True" LineHeight="1">
</FlowDocument>
</RichTextBox.Document>
</RichTextBox>