设置窗体透明C#代码

Posted 2020-06-16

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：

 1 using System;
 2 using System.Runtime.InteropServices;
 3 using System.Windows.Forms;
 4 
 5 namespace HoverTreeWinForm
 6 {
 7 public partial class FormHewenqi : Form
 8 {
 9 
10 /// <summary>
11 /// 使窗体透明 by 何问起
12 /// </summary>
13 protected override CreateParams CreateParams
14 {
15 get
16 {
17 
18 CreateParams parameter = base.CreateParams;
19 parameter.ExStyle |= 0x00080000;
20 return parameter;
21 
22 }
23 }
24 
25 /// <summary>
26 /// http://hovertree.com/h/bjaf/v4y0b2l6.htm
27 /// </summary>
28 /// <returns></returns>
29 [DllImport("User32.dll")]
30 public static extern int MessageBox(int h, string m, string c, int type);
31 public FormHewenqi()
32 {
33 InitializeComponent();
34 //使控件不透明
35 this.TransparencyKey = BackColor;
36 }
37 
38 private void button_hewenqi_Click(object sender, EventArgs e)
39 {
40 MessageBox(0, "Hello Win32 API HoverTree", "何问起网", 4);
41 }
42 
43 private void linkLabel_help_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
44 {
45 System.Diagnostics.Process.Start("http://hovertree.com/h/bjaf/v4y0b2l6.htm");
46 }
47 
48 private void button_hoverc_Click(object sender, EventArgs e)
49 {
50 //获取主窗体句柄
51 IntPtr h_handle = HewenqiUser32.GetCurrentWindowHandle();
52 int h_jubing = 0; ;
53 if (h_handle != IntPtr.Zero)
54 h_jubing = (int)(h_handle);
55 MessageBox(h_jubing, "Hello hovertree.com", "欢迎光临何问起", 4);
56 }
57 }
58 }

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