C# 鼠标穿透窗体功能

　　同样该功能需要加载命名空间

　　using System.Runtime.InteropServices;

　　private const uint WS_EX_LAYERED = 0x80000;

　　private const int WS_EX_TRANSPARENT = 0x20;

　　private const int GWL_STYLE = (-16);

　　private const int GWL_EXSTYLE = (-20);

　　private const int LWA_ALPHA = 0;

　　[DllImport("user32", EntryPoint = "SetWindowLong")]

　　private static extern uint SetWindowLong(

　　IntPtr hwnd,

　　int nIndex,

　　uint dwNewLong

　　);

　　[DllImport("user32", EntryPoint = "GetWindowLong")]

　　private static extern uint GetWindowLong(

　　IntPtr hwnd,

　　int nIndex

　　);

　　[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]

　　private static extern int SetLayeredWindowAttributes(

　　IntPtr hwnd,

　　int crKey,

　　int bAlpha,

　　int dwFlags

　　);

　　///

　　public void SetPenetrate()

　　{

　　GetWindowLong(this.Handle, GWL_EXSTYLE);

　　SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);

　　SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);

　　}