无边框窗体的移动和任务栏菜单的实现

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace NetWork
{
    public partial class Form2 : Form
    {
        private const int WM_SETREDRAW = 0x000B;
        private const int HTCAPTION = 0x0002;//表示鼠标在窗口标题栏时的系统信息
        private const int WM_NCHITTEST = 0x84;//鼠标在窗体客户区（除了标题栏和边框以外的部分）时发送的消息
        private const int HTCLIENT = 0x1;//表示鼠标在窗口客户区的系统消息

        [DllImport("user32.dll", EntryPoint = "SetWindowLong", CharSet = CharSet.Auto)]
        public static extern IntPtr SetWindowLong(HandleRef hWnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll", EntryPoint = "GetWindowLong", CharSet = CharSet.Auto)]
        public static extern int GetWindowLong(HandleRef hWnd, int nIndex);

        [DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        private void MenuShow()
        {
            int WS_SYSMENU = 0x80000; // 系统菜单
            int WS_MINIMIZEBOX = 0x20000; // 最大最小化按钮
            int WS_MAXIMIZEBOX = 0x00010000;

            int windowLong = (GetWindowLong(new HandleRef(this, this.Handle), -16));
            SetWindowLong(new HandleRef(this, this.Handle), -16, (windowLong | WS_SYSMENU | WS_MINIMIZEBOX) & (~WS_MAXIMIZEBOX));
        }
        public Form2()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint, true);
            this.UpdateStyles();
            MenuShow();
            SendMessage(this.Handle, WM_SETREDRAW, 0, 0);
        }

        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_NCHITTEST: //如果鼠标移动或单击
                    base.WndProc(ref m);//调用基类的窗口过程——WndProc方法处理这个消息
                    if (m.Result == (IntPtr)HTCLIENT)//如果返回的是HTCLIENT
                    {
                        m.Result = (IntPtr)HTCAPTION;//把它改为HTCAPTION
                        return;//直接返回退出方法
                    }
                    break;
            }
            base.WndProc(ref m);//如果不是鼠标移动或单击消息就调用基类的窗口过程进行处理
        }

        private void Form2_Load(object sender, EventArgs e)
        {
                   }
         }
}

其他窗体直接继承此窗体就ok