//Client
public BuilderPattern()
{
//随意替换具体Builder,不可用基类，见下注释
ConcreteBuilder2 builder = new ConcreteBuilder2();
//Director如有需要也可以切换
Director director = new Director(builder);
director.Construct();
//具体构造器返回具体结果,可以将结果直接返回
//因可能会构造出不同的结果，因此不能将这个方法作为Builder基类，需客户端自行调用
builder.GetResult();
}
public void Run()
{
// Create director and builders
Director director = new Director();
Builder b1 = new ConcreteBuilder1();
Builder b2 = new ConcreteBuilder2();
// Construct two products
director.Construct(b1);
Product p1 = b1.GetResult();
p1.Show();
director.Construct(b2);
Product p2 = b2.GetResult();
p2.Show();
}