设置背景透明的窗体，GDI+绘制异形WINFORM

Jun 13, 2012#csharp #dotnet #gdi127

AI-generated summary

This article discusses how to create a transparent window with different shapes using GDI+ in C#. It explains that in .Net environment, it is easy to draw shapes like rectangles, ellipses, and triangles on a window by setting the window's background to transparent. The article provides code examples in both VB.net and C#.net to demonstrate how to achieve this.

在.Net 环境下绘制矩形，椭圆形，三角形等形态的窗体是件很简单的事情，只要设置窗体的背景透明当你在窗体上绘制图形和控件时，是不会显示窗体的，这点 MS 的 GDI + 确实相比其他平台的实现方式更加方便和简单。

设置方式也很简单，首先设置 FORM 的 BackColor 为一个程序中不常用的颜色，然后再设置 FORM 的 TransparenceKey 为这个颜色就 OK 了。

参考 VB.net 代码

Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
' 设置背景
Me.BackColor = Color.Black
' 设置透明
Me.TransparencyKey = Color.Black
end sub

C#.net

    private void Form1\_Load(object sender, EventArgs e)
    {
        this.BackColor = Color.Black
        this.TransparencyKey  = Color.Black 
    }