C#绘制图形源码实例，绘制一个扇形，点击绘制按钮，立即出现一个房型，这是固定形状的图形绘制，相对较简单的那种，所以适合C#初学者-C# source code examples draw graphics, drawing a fan, click the Draw button, and immediately a room, which is fixed shape graphics rendering, the kind of relatively simple, so suitable