实现目的：按住某组合键时,窗体隐藏或显示,本教程代码为完整代码,直接复制即可使用,

1、创建一个类,类名命名为 Hotkey 在类中写入如下代码：

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Text;
7. using System.Windows.Forms;
8. using System.Runtime.InteropServices;
9. using System.Collections;
10.  
11. namespace WindowsFormsApplication1
12. {
13. public delegate void HotkeyEventHandler(int HotKeyID);
14.  
15.  
16.  
17. public class Hotkey : System.Windows.Forms.IMessageFilter
18. {
19. Hashtable keyIDs = new Hashtable();
20. IntPtr hWnd;
21.  
22. static public int Hotkey1;
23.  
24. public event HotkeyEventHandler OnHotkey;
25.  
26. public enum KeyFlags
27. {
28. MOD_ALT = 0x1,
29. MOD_CONTROL = 0x2,
30. MOD_SHIFT = 0x4,
31. MOD_WIN = 0x8
32. }
33. [DllImport("user32.dll")]
34. public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);
35.  
36. [DllImport("user32.dll")]
37. public static extern UInt32 UnregisterHotKey(IntPtr hWnd, UInt32 id);
38.  
39. [DllImport("kernel32.dll")]
40. public static extern UInt32 GlobalAddAtom(String lpString);
41.  
42. [DllImport("kernel32.dll")]
43. public static extern UInt32 GlobalDeleteAtom(UInt32 nAtom);
44.  
45. public Hotkey(IntPtr hWnd)
46. {
47. this.hWnd = hWnd;
48. Application.AddMessageFilter(this);
49. }
50.  
51. public int RegisterHotkey(Keys Key, KeyFlags keyflags)
52. {
53. UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());
54. RegisterHotKey((IntPtr)hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);
55. keyIDs.Add(hotkeyid, hotkeyid);
56. return (int)hotkeyid;
57. }
58.  
59. public void UnregisterHotkeys()
60. {
61. Application.RemoveMessageFilter(this);
62. foreach (UInt32 key in keyIDs.Values)
63. {
64. UnregisterHotKey(hWnd, key);
65. GlobalDeleteAtom(key);
66. }
67. }
68.  
69. public bool PreFilterMessage(ref System.Windows.Forms.Message m)
70. {
71. if (m.Msg == 0x312)
72. {
73. if (OnHotkey != null)
74. {
75. foreach (UInt32 key in keyIDs.Values)
76. {
77. if ((UInt32)m.WParam == key)
78. {
79. OnHotkey((int)m.WParam);
80. return true;
81. }
82. }
83. }
84. }
85. return false;
86. }
87. }
88. }

2、在窗体中创建过程,并在加载时间中写入代码,完整代码如下：

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.  
10. namespace WindowsFormsApplication1
11. {
12. public partial class Form1 : Form
13. {
14. public Form1()
15. {
16. InitializeComponent();
17. }
18.  
19. public void OnHotkey(int HotkeyID) //alt+z隐藏窗体，再按显示窗体。
20. {
21. if (HotkeyID == Hotkey.Hotkey1)
22. {
23. if (this.Visible == true)
24. this.Visible = false;
25. else
26. this.Visible = true;
27. }
28. else
29. {
30. this.Visible = false;
31. }
32. }
33.  
34. private void Form1_Load(object sender, EventArgs e)
35. {
36. Hotkey hotkey;
37. hotkey = new Hotkey(this.Handle);
38. Hotkey.Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.Z, Hotkey.KeyFlags.MOD_ALT); //定义快键(alt+z)
39. hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);
40. }
41. }
42. }