无标题窗体的拖动,在MouseMove中实现,非MouseUP!

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1
{
    public class Form1 : System.Windows.Forms.Form
    {
        private Point mouseOffset;
        private bool isMouseDown = false;

        private System.Windows.Forms.Button button1;
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            InitializeComponent();

        }

        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(208, 224);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(80, 40);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.Add(this.button1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Name = "Form1";
            this.Text = "Form1";
            this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
            this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
            this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
            this.ResumeLayout(false);

        }
        #endregion

        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void button1_Click(object sender, System.EventArgs e) {
            this.Close();
        }

        private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) {
            int xOffset;
            int yOffset;
            //先记得窗体内部的作标,标以负数是因为:当前的Location=当前屏幕的光标位置+(-1*窗体内部作标)
            xOffset = -e.X;
            yOffset = -e.Y;

            mouseOffset = new Point(xOffset, yOffset);
            isMouseDown = true;

        }

        private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) {
            if (isMouseDown) {
                Point mousePos = Control.MousePosition;
                //移动后,用新的屏幕作标+(-1*窗体内部作标)=窗体的Location+增量N,而增量N对于三个数来讲都是相对的,
                //所以Form的新作标为原Location+增量N.
                mousePos.Offset(mouseOffset.X, mouseOffset.Y);
                Location = mousePos;
            }

        }

        private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) {

            if (e.Button == MouseButtons.Left) {
         &nb#