<Window x:Class="wpfwindowsmove.毛边窗体"

        xmlns=""

        xmlns:x=""

        Title="毛边窗体" Height="300" Width="300"

        AllowsTransparency="True" WindowStyle="None" Background="Transparent"

        >

    <Grid>

        <Border BorderThickness="1" CornerRadius="50">

            <Border.Background>

                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

                    <GradientStop Color="Green" Offset="0"></GradientStop>

                    <GradientStop Color="Blue" Offset="1"></GradientStop>

                    <GradientStop Color="Yellow"></GradientStop>

                </LinearGradientBrush>

            </Border.Background>

            <Border.BitmapEffect>

                <BlurBitmapEffect></BlurBitmapEffect>

            </Border.BitmapEffect>

           

        </Border>

    </Grid>

</Window>