多态的实现序列化

转载：http://www.cnblogs.com/jiangfei5945/p/3483704.html

多态的实现序列化，乍一听有点蒙，其实就是序列化的时候序列化子类，反序列化的时候能多态的反序列化出子类来。

举例来说，下面的代码，定义了三个类ClassToSerialize是父类，ConcreteClassToSerializeA 和ConcreteClassToSerializeB 子类。

当我们序列化是序列化ConcreteClassToSerializeA，反序列化的时候我们希望反序列化出ConcreteClassToSerializeA对象，而不是ConcreteClassToSerializeB ，更不是ClassToSerialize。

    [Serializable]
    [XmlInclude(typeof(ConcreteClassToSerializeA))]
    [XmlInclude(typeof(ConcreteClassToSerializeB))]
    public class ClassToSerialize
    {
        public string Name { get; set; }
        //public bool CanExecute(string name)
        //{
        //    return string.IsNullOrEmpty(name) ? false : true;
        //}
    }

    [Serializable]
    public class ConcreteClassToSerializeA : ClassToSerialize
    {
        public int Age { get; set; }
    }

    [Serializable]
    public class ConcreteClassToSerializeB : ClassToSerialize
    {
        public string Gender { get; set; }
    }

要想实现上述的需求，基类上必须添加[XmlInclude(typeof(ConcreteClassToSerializeB))]这样的属性。

        public static void SerializeNow()
        {
            ConcreteClassToSerializeA c = new ConcreteClassToSerializeA();
            c.Name = "asdf";
            c.Age = 12;
            FileStream fileStream = new FileStream("e:\\temp1.txt", FileMode.Create);
            XmlSerializer b = new XmlSerializer(typeof(ClassToSerialize));
            b.Serialize(fileStream, c);
            fileStream.Close();
        }

        public static void DeSerializeNow()
        {
            object c = null;
            FileStream fileStream = new FileStream("e:\\temp1.txt", FileMode.Open, FileAccess.Read, FileShare.Read);
            XmlSerializer b = new XmlSerializer(typeof(ClassToSerialize));
            c = b.Deserialize(fileStream);
            Console.WriteLine(c.ToString());
            fileStream.Close();
        }

注意XmlSerializer实例化的类型都是typeof(ClassToSerialize)。