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(0, "Hello Win32 API HoverTree", "何问起网", 4);
}

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 = 0; ;
if (h_handle != IntPtr.Zero)
h_jubing = (int)(h_handle);
MessageBox(h_jubing, "Hello hovertree.com", "欢迎光临何问起", 4);
}
}
}

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