c#实现随鼠标移动窗体

1. private void MainForm_Load(object sender, EventArgs e)
2. {
3. //绑定事件
4. MouseMove += Form_MouseMove;
5. MouseDown += Form_MouseDown;
6. }
7. private Point _mousePoint;
8. private void Form_MouseMove(object sender, MouseEventArgs e)
9. {
10. if (e.Button == MouseButtons.Left)
11. {
12. Top = MousePosition.Y - _mousePoint.Y;
13. Left = MousePosition.X - _mousePoint.X;
14. }
15. }
16. private void Form_MouseDown(object sender, MouseEventArgs e)
17. {
18. if (e.Button == MouseButtons.Left)
19. {
20. _mousePoint.X = e.X;
21. _mousePoint.Y = e.Y;
22. }
23. }

如果窗体有标题 
Top -= SystemInformation.CaptionHeight;

如果有边框 
Top -= SystemInformation.FormBorderSize.Height
Left -= SystemInformation.FormBorderSize.Width