Winform 去掉 最大化 最小化 关闭按钮（不是关闭按钮变灰）终极解决办法

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Linq;
7. using System.Text;
8. using System.Windows.Forms;
9. using System.Drawing.Drawing2D;
10. using System.Runtime.InteropServices;
11. namespace WinDemo
12. {
13. public partial class Form5 : Form
14. {
15. public Form5()
16. {
17. InitializeComponent();
18. }
19. /// <summary>
20. /// Button 按钮重绘事件
21. /// </summary>
22. /// <param name="sender"></param>
23. /// <param name="e"></param>
24. private void button1_Paint(object sender, PaintEventArgs e)
25. {
26. GraphicsPath myPath = new GraphicsPath();
27. Rectangle rect = new Rectangle(0,0,574,362);//后面2个数据调整窗体大小
28. myPath.AddRectangle(rect);
29. this.Region = new Region(myPath);
30. }
31. [DllImport("user32.dll")]
32. static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
33. [DllImport("User32.dll")]
34. private static extern IntPtr GetWindowDC(IntPtr hWnd);
35. protected override void WndProc(ref System.Windows.Forms.Message m)
36. {
37. const int WM_NCPAINT = 0x85;
38. base.WndProc(ref m);
39. if (m.Msg == WM_NCPAINT)
40. {
41. IntPtr hdc = GetWindowDC(m.HWnd);
42. if ((int)hdc != 0)
43. {
44. Graphics g = Graphics.FromHdc(hdc);
45. Pen pen1 = new Pen(Color.FromArgb(64,64,64));
46. Pen pen2 = new Pen(Color.FromArgb(128, 128, 128));
47. Pen pen3 = new Pen(Color.FromArgb(212, 208, 200));
48. g.DrawLine(pen1, 573, 0, 573, 360);//最外边
49. g.DrawLine(pen2, 572, 1, 572, 359);//最外边第二条白色
50. g.DrawLine(pen3, 571, 2, 571, 359);
51. g.DrawLine(pen3, 571, 2, 571, 359);
52. g.Flush();
53. ReleaseDC(m.HWnd, hdc);
54. }
55. }
56. }
57. private void Form5_MouseCaptureChanged(object sender, EventArgs e)
58. {
59. Graphics g = this.CreateGraphics();
60. Pen pen1 = new Pen(Color.FromArgb(64, 64, 64));
61. Pen pen2 = new Pen(Color.FromArgb(128, 128, 128));
62. Pen pen3 = new Pen(Color.FromArgb(212, 208, 200));
63. g.DrawLine(pen1, 573, 0, 573, 360);//最外边
64. g.DrawLine(pen2, 572, 1, 572, 359);//最外边第二条白色
65. g.DrawLine(pen3, 571, 2, 571, 359);
66. g.DrawLine(pen3, 571, 2, 571, 359);
67. g.Flush();
68. }
69. }
70. }

using System.Runtime.InteropServices;

[DllImport("user32.dll")]
        internal static extern IntPtr GetSystemMenu(IntPtr hwnd, bool bRevert);

[DllImport("user32.dll")]
        internal static extern int GetMenuItemCount(IntPtr hMenu);

[DllImport("user32.dll")]
        internal static extern int RemoveMenu(IntPtr hMenu, int uPosition, int uFlags);

///   <summary> 
        ///   窗体的关闭按钮失效 
        ///   </summary> 
        protected void CloseButtonEnable()
        {
            //   默认窗口去除关闭按钮 
            const int MF_BYPOSITION = 0x00000400;

IntPtr hWindow = this.Handle;
            IntPtr hMenu = GetSystemMenu(hWindow, false);
            int count = GetMenuItemCount(hMenu);
            RemoveMenu(hMenu, count - 1, MF_BYPOSITION);
            RemoveMenu(hMenu, count - 2, MF_BYPOSITION);
        }

private void confirm_Load(object sender, EventArgs e)
        {
            CloseButtonEnable();

}