C# WinForm 鼠标左键拖动窗体

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C# WinForm 鼠标左键拖动窗体

仔细看 亲测实现 ：

public partial class Form1 : Form
    {

        Point mouseOff;
        bool leftFlag=false;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        //第一步
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button==MouseButtons.Left)
            {
                mouseOff = new Point(-e.X,-e.Y);
                leftFlag = true;
            }
        }
        //第二步
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                Point mouseSet = Control.MousePosition;
                mouseSet.Offset(mouseOff.X,mouseOff.Y);
                this.Location = mouseSet;
            }
        }
        //第三步
        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                leftFlag = false;
            }
        }
    }