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，高手就不要看了。-C# to draw graphical source code examples, draw a fan-shaped, click the Draw button, immediately one room type, which is a fixed shape of the graphics rendering, relatively sim