C#可拖动窗体(实现无标题栏的登录窗体)

   public partial class frmLogin : Form

    {

        private Point _MouseOffset;

        private bool _IsMouseDown = false;

        public frmLogin()

        {

            InitializeComponent();

        }

        private void frmLogin_MouseDown(object sender, MouseEventArgs e)

        {

            int xOffset;

            int yOffset;

            if (e.Button == MouseButtons.Left)

            {

                xOffset = -e.X;

                yOffset = -e.Y;

                _MouseOffset = new Point(xOffset, yOffset);

                _IsMouseDown = true;

            }

        }

        private void frmLogin_MouseMove(object sender, MouseEventArgs e)

        {

            if (_IsMouseDown)

            {

                Point mousePos = Control.MousePosition;

                mousePos.Offset(_MouseOffset.X, _MouseOffset.Y);

                Location = mousePos;

            }

        }

        private void frmLogin_MouseUp(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                _IsMouseDown = false;

            }

        }

        private void btnCancel_Click(object sender, EventArgs e)

        {

            Application.Exit();

        }

        private void btnLogin_Click(object sender, EventArgs e)

        {

            lbStatus.Text = "正在初始化系统...";

            Thread.Sleep(1000);

            lbStatus.Text = "正在初始化权限数据...";

            Thread.Sleep(1000);

        }

    }