static void Main(string[] args)
{
var proxy = new ImageProxy("1.png");
var fileName = proxy.GetFileName();
proxy.Draw();
Console.ReadLine();
}
static void Main(string[] args)
{
//客户端只知道代理对象，不知道真实对象
Graphic proxy = new ImageProxy("图片a", 200, 300);
var extent = proxy.GetExtent();
Console.WriteLine("宽：" + extent.Weight + ",高：" + extent.Height);
Console.WriteLine("————————");
proxy.Draw();
extent = proxy.GetExtent();
Console.WriteLine("宽：" + extent.Weight + ",高：" + extent.Height);
Console.ReadLine();
}
static void Main(string[] args)
{
var imageProxy = new ImageProxy();
imageProxy.Draw();
}