效果图：






	复制代码 代码如下:

	

	using System;

	using System.Collections.Generic;

	using System.ComponentModel;

	using System.Data;

	using System.Drawing;

	using System.Text;

	using System.Windows.Forms;

	using System.ServiceModel;

	using System.Runtime.InteropServices;

	namespace MyWeather

	{

	public partial class Form1 : Form

	{

	[StructLayout(LayoutKind.Sequential)]

	public struct MARGINS

	{

	public int Left;

	public int Right;

	public int Top;

	public int Bottom;

	}

	[DllImport("dwmapi.dll", PreserveSig = false)]

	static extern void DwmExtendFrameIntoClientArea(IntPtr hwnd, ref MARGINS margins);

	[DllImport("dwmapi.dll", PreserveSig = false)]

	static extern bool DwmIsCompositionEnabled();

	public Form1()

	{

	InitializeComponent();

	}

	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);

	}

	protected override void OnPaintBackground(PaintEventArgs e)

	{

	base.OnPaintBackground(e);

	if (DwmIsCompositionEnabled())

	{

	e.Graphics.Clear(Color.Black);

	}

	}

	}

	}