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我怎樣才能使一個RichTextBox用虛線邊框的RichTextBox與虛線邊框
我想是這樣的:
<Border Width="100" Height="100" Background="White" BorderThickness="1,1,1,1">
<RichTextBox Name="richTextBox1" />
<Border.BorderBrush>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,.1" SpreadMethod="Repeat" >
<GradientStopCollection>
<GradientStop Color="Transparent" Offset="0" />
<GradientStop Color="Transparent" Offset="0.2" />
<GradientStop Color="Red" Offset="0.2" />
<GradientStop Color="Red" Offset="0.4" />
<GradientStop Color="Transparent" Offset="0.4" />
<GradientStop Color="Transparent" Offset="0.6" />
<GradientStop Color="Red" Offset="0.6" />
<GradientStop Color="Red" Offset="0.8" />
<GradientStop Color="Transparent" Offset="0.8" />
<GradientStop Color="Transparent" Offset="0.9" />
<GradientStop Color="Red" Offset="0.9" />
<GradientStop Color="Red" Offset="1" />
</GradientStopCollection>
</LinearGradientBrush>
</Border.BorderBrush>
</Border>
但僅適用於左/右或頂部/底部