C# 设置Windows程序窗口为穿透状态

代码：
 1         private const uint WS_EX_LAYERED = 0x80000;
 2         private const int WS_EX_TRANSPARENT = 0x20;
 3         private const int GWL_STYLE = (-16);
 4         private const int GWL_EXSTYLE = (-20);
 5         private const int LWA_ALPHA = 0;
 6 
 7         [DllImport("user32", EntryPoint = "SetWindowLong")]
 8         private static extern uint SetWindowLong(
 9         IntPtr hwnd,
10         int nIndex,
11         uint dwNewLong
12         );
13 
14         [DllImport("user32", EntryPoint = "GetWindowLong")]
15         private static extern uint GetWindowLong(
16         IntPtr hwnd,
17         int nIndex
18         );
19 
20         [DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
21         private static extern int SetLayeredWindowAttributes(
22         IntPtr hwnd,
23         int crKey,
24         int bAlpha,
25         int dwFlags
26         );
27 
28         /// <summary> 
29         /// 设置窗体具有鼠标穿透效果 
30         /// </summary> 
31         public void SetPenetrate()
32         {
33             this.TopMost = true;
34             GetWindowLong(this.Handle, GWL_EXSTYLE);
35             SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
36             SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);
37         }