摘要： class Program { static void Main(string[] args) { A a = new B() { AA = "aa", BA = "ba" }; B b = (B)a; Console.WriteLine(b.AA + "" + b.BA); } } class A { public string AA { get; set; } } class B : A { public string BA { get; set; } }输出结果：aaba测试结果：B>A>B 过程中 B的BA属... 阅读全文