设置一个文件夹的透明度
就是得一个窗体，如打开了一个word，或者文件夹。然后写一个代码设置它的透明度。这样可以吗？

[解决办法]
记事本为例，参考：

C# code

using System.Runtime.InteropServices;[DllImport("user32.dll")]private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);[DllImport("user32.dll")]private static extern int GetWindowLong(IntPtr hWnd, int nIndex);[DllImport("user32.dll")]public static extern IntPtr FindWindow(string lpszClass, string lpszWindow);[DllImport("user32.dll")]public static extern bool SetLayeredWindowAttributes(    IntPtr hWnd, int crKey, byte bAlpha, int dwFlags);[DllImport("user32.dll")]public static extern bool RedrawWindow(IntPtr hWnd, IntPtr lprcUpdate,     IntPtr hrgnUpdate, uint flags);public const int GWL_EXSTYLE = -20;public const int WS_EX_LAYERED = 0x00080000;public const int LWA_ALPHA = 0x00000002;public const int RDW_INVALIDATE = 1;public const int RDW_ERASE = 4;public const int RDW_ALLCHILDREN = 0x80;public const int RDW_FRAME = 0x400;private void button1_Click(object sender, EventArgs e){    //设置透明    IntPtr vHandle = FindWindow("Notepad", null);    SetWindowLong(vHandle, GWL_EXSTYLE,        GetWindowLong(vHandle, GWL_EXSTYLE) | WS_EX_LAYERED);    SetLayeredWindowAttributes(vHandle, 0, 255 / 2/*透明度*/, LWA_ALPHA); }private void button2_Click(object sender, EventArgs e){    //恢复    IntPtr vHandle = FindWindow("Notepad", null);    SetWindowLong(vHandle, GWL_EXSTYLE,        GetWindowLong(vHandle, GWL_EXSTYLE) & ~WS_EX_LAYERED);    RedrawWindow(vHandle, IntPtr.Zero, IntPtr.Zero,        RDW_ERASE | RDW_INVALIDATE | RDW_FRAME | RDW_ALLCHILDREN);}
[解决办法]
楼主别忘了把答案贴上来啊，让我们也学习学习，谢谢
[解决办法]
SetLayeredWindowAttributes