wpf之渐变色LinearGradientBrush

xmal代码：

<Grid Name="grid1">
     <Grid.Background>
         <LinearGradientBrush>
             <LinearGradientBrush.GradientStops>
                 <GradientStop Offset="0" Color="red"></GradientStop>
                 <GradientStop Offset="0.5" Color="blue"></GradientStop>
                 <GradientStop Offset="1" Color="Yellow"></GradientStop>
             </LinearGradientBrush.GradientStops>
         </LinearGradientBrush>
     </Grid.Background>
</Grid>

也可以用C#代码实现，等价的C#代码为：

public MainWindow()
{
     InitializeComponent();
     MyLinearGradientBrush();
}

public void MyLinearGradientBrush()
 8 {
     LinearGradientBrush brush = new LinearGradientBrush();

     GradientStop gs1 = new GradientStop();
     gs1.Offset = 0;
     gs1.Color = Colors.Red;
     brush.GradientStops.Add(gs1);

     GradientStop gs2 = new GradientStop();
     gs2.Offset = 0.5;
     gs2.Color = Colors.Blue;
     brush.GradientStops.Add(gs2);

     GradientStop gs3 = new GradientStop();
     gs3.Offset = 1;
     gs3.Color = Colors.Yellow;
　　　　 //因为GradientStops属性返回一个GradientStopCollection对象，而且GradientStopCollection类实现了IList接口
     brush.GradientStops.Add(gs3);//所以这句代码的本质是IList list = brush.GradientStops; list.Add(gs3);

     grid1.Background = brush;
}