设置窗体透明C#代码

上个示例是C#调用windows api

在原来代码上加入窗体透明，控件不透明代码：

 using System;
 using System.Runtime.InteropServices;
 using System.Windows.Forms;

 namespace HoverTreeWinForm
 {
 public partial class FormHewenqi : Form
 {

 /// <summary>
 /// 使窗体透明 by 何问起
 /// </summary>
 protected override CreateParams CreateParams
 {
 get
 {

 CreateParams parameter = base.CreateParams;
 parameter.ExStyle |= 0x00080000;
 return parameter;

 }
 }

 /// <summary>
 /// http://hovertree.com/h/bjaf/v4y0b2l6.htm
 /// </summary>
 /// <returns></returns>
 [DllImport("User32.dll")]
 public static extern int MessageBox(int h, string m, string c, int type);
 public FormHewenqi()
 {
 InitializeComponent();
 //使控件不透明
 this.TransparencyKey = BackColor;
 }

 private void button_hewenqi_Click(object sender, EventArgs e)
 {
 MessageBox(, "Hello Win32 API HoverTree", "何问起网", );
 }

 private void linkLabel_help_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 {
 System.Diagnostics.Process.Start("http://hovertree.com/h/bjaf/v4y0b2l6.htm");
 }

 private void button_hoverc_Click(object sender, EventArgs e)
 {
 //获取主窗体句柄
 IntPtr h_handle = HewenqiUser32.GetCurrentWindowHandle();
 int h_jubing = ; ;
 if (h_handle != IntPtr.Zero)
 h_jubing = (int)(h_handle);
 MessageBox(h_jubing, "Hello hovertree.com", "欢迎光临何问起", );
 }
 }
 }

1、先把窗体的颜色变成一种很不常见的颜色。 
2、把该窗体的TransparecyKey的颜色设置成窗体的颜色。 
3、加入控件，但是控件的颜色不能和窗体颜色一致，否则控件也透明。 
运行程序后，就只能看见标题栏和控件了。

转自：http://hovertree.com/h/bjaf/i3lp7ay0.htm

演示下载：http://pan.baidu.com/s/1mhfgJ6C g56m

源码下载：https://github.com/shangyuxian/HoverTree