WPF渐变效果

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<Rectangle Grid.Row="0">
            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Color="#FFA2D6F3" Offset="0.0" />
                    <GradientStop Color="White" Offset="0.75" />
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>