本文实例讲述了WinForm特效之桌面上的遮罩层实现方法，分享给大家供大家参考之用。具体如下：
这个一个窗体特效，可以帮你了解几个windows api函数。
效果：windows桌面上增加一个简单的遮罩层,其中WS_EX_TRANSPARENT 比较重要，它实现了鼠标穿透的功能。
主要功能代码如下：
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsApplication40
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
[DllImport("user32.dll", EntryPoint = "GetWindowLong")]
public static extern long GetWindowLong(IntPtr hwnd, int nIndex);
[DllImport("user32.dll", EntryPoint = "SetWindowLong")]
public static extern long SetWindowLong(IntPtr hwnd, int nIndex, long dwNewLong);
[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
private static extern int SetLayeredWindowAttributes(IntPtr Handle, int crKey, byte bAlpha, int dwFlags);
const int GWL_EXSTYLE = -20;
const int WS_EX_TRANSPARENT = 0x20;
const int WS_EX_LAYERED = 0x80000;
const int LWA_ALPHA = 2;
private void Form1_Load(object sender, EventArgs e)
{
this.BackColor = Color.Silver;
this.TopMost = true;
this.FormBorderStyle = FormBorderStyle.None;
this.WindowState = FormWindowState.Maximized;
SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) | WS_EX_TRANSPARENT | WS_EX_LAYERED);
SetLayeredWindowAttributes(Handle, 0, 128, LWA_ALPHA );
}
}
}
希望本文所述对大家C#程序设计的学习有所帮助。
