代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Runtime.InteropServices;//引用DLL申明

namespace WindowsFormsApplication1
{
    public
 
 partial class Form1 : Form
    {
        //DLL申明
        [StructLayout(LayoutKind.Sequential)]
        public struct MARGINS
        {
            public int Left;
            public int Right;
            public int Top;
            public int Bottom;
        }

        //DLL申明
        [DllImport("
 
dwmapi.dll", PreserveSig = false)]
        static extern void DwmExtendFrameIntoClientArea(IntPtr hwnd, ref MARGINS
        margins);

        //DLL申明
        [DllImport("dwmapi.dll", PreserveSig = false)]
        static extern bool DwmIsCompositionEnabled();

        //直接添加代碼
        protected
 
 override void OnLoad(EventArgs e)
        {
            if (DwmIsCompositionEnabled())
            {
                MARGINS margins = new MARGINS();
                margins.Right = margins.Left = margins.Top = margins.Bottom =
        this.Width + this.Height;
                DwmExtendFrameIntoClientArea(this.Handle, ref margins);
            }
            base.OnLoad(e);
        }

        //直接添加代碼
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            base.OnPaintBackground(e);
            if (DwmIsCompositionEnabled())
            {
                e.Graphics.Clear(Color.Black);
            }
        }

        public Form1()
        {
            InitializeComponent();
        }
    }
}

這中效果的實現主要是調用了系統的dwmapi.dll。

dwmapi.dll是Microsoft Desktop Window Manager API（桌面窗口管理器DWM 的公用界面）的動態鏈接庫，正常文件，主要用作桌面效果的api。

DWM 是一種新界面，在除 Windows Vista Home Basic 之外的所有 Windows Vista 版本中均提供 DWM 界面。所以這種效果只能在Vista之後的系統中使用。

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