C# 毛玻璃 透明效果

using System.Runtime.InteropServices;
public struct Margins //邊距結構
        {
            public int Left;
            public int Right;
            public int Top;
            public int Bottom;
        }
        [DllImport("dwmapi.dll", PreserveSig = false)]//引入Dll
        static extern void DwmExtendFrameIntoClientArea(IntPtr dwm, ref Margins margins);//Dll中的用法
        [DllImport("dwmapi.dll", PreserveSig = false)]//引入Dll
        static extern bool DwmIsCompositionEnabled();//Dll中的用法
 
        public Form1()
        {
            InitializeComponent();
            this.Opacity = 0.95;//改變視窗透明度
        }
 
        protected override void OnLoad(EventArgs e)//複寫OnLoad
        {
            Margins margins = new Margins() { };
            margins.Right = margins.Left = margins.Top = margins.Bottom = -1;
            if (DwmIsCompositionEnabled())//檢查特效是否開啟
                DwmExtendFrameIntoClientArea(this.Handle, ref margins);//使用Aero特效
            base.OnLoad(e);
        }
 
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            base.OnPaintBackground(e);
            if (DwmIsCompositionEnabled())
                e.Graphics.Clear(Color.Black);//將視窗顏色填充為黑色(Aero中黑色為要用特效的區域)
        }