WPF示例-1-渐变效果

代码如下：

<Window x:Class="wpf_win_1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="渐变" Height="300" Width="300">
<Grid x:Name="gdTest">
<Rectangle Margin="37,5,30,0" Name="re1" Height="111" Stroke="Black" VerticalAlignment="Top">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0" Color="White"></GradientStop>
<GradientStop Offset="1" Color="Black"></GradientStop>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Rectangle Margin="37,125,30,45" Name="re2" Stroke="Black" >
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0" Color="White"></GradientStop>
<GradientStop Offset="1" Color="Black"></GradientStop>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Rectangle Margin="42,130,35,49" Name="re3" Stroke="Black">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <!--StartPoint=开始的点 | EndPoint=结束的点-->
<GradientStop Offset="0" Color="Black"></GradientStop>
<GradientStop Offset="1" Color="White"></GradientStop>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Grid>
</Window>