public class Class0
    {
        public void Method1()
        {
            Class1 c1 = new Class1();
            c1.Method1();
        }
    }

    public class Class1
    {
        public void Method1()
        {
            Class2 c2 = new Class2();//此处调用
        }
    }

    public class Class2
    {
        public Class2()
        {
            //获得调用来源, 即对象c1
        }
    }