XML序列化的泛型 Dictionary引起的问题 ---- XmlInclude 妙用

使用了网上盛传的SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable 进行序列化Dictionary时，出现了序列化类型与对象实例类型不符的情况，不能序列化。

程序是这样的

 

    public class TestObject
    {
        public TestObject()
        {

        }
        public TestObject(Dictionary<A, string> dic)
        {
            this.dic = new SerializableDictionary<A, string>(dic);
        }

        public SerializableDictionary<A, string> dic;
    }

    public abstract class A
    {
        public A()
        {

        }

        public A(int i)
        {
            this.i = i;
        }
        public int i;
    }

    public class B : A
    {
        public B()
        {

        }

        public B(int i)
            : base(i)
        {
            str = i.ToString();
        }
        public string str;
    }

 序列化TestObject对象程序：

            Dictionary<A, string> dic = new Dictionary<A, string>();
            dic.Add(new B(1), "1");
            dic.Add(new B(2), "2");
            dic.Add(new B(3), "3");
            dic.Add(new B(4), "4");
            TestObject obj = new TestObject(dic);

            // Serialize the object to a file.
            XmlTextWriter writer = new XmlTextWriter(@"c:\test.xml", null);
            XmlSerializer serializer = new XmlSerializer(typeof(TestObject));
            serializer.Serialize(writer, obj);

 

结果，序列化类型与对象实例类型不符，序列化错误。

如何解决呢？用XmlInclude声明序列化类型，就可解决了。

在基类A上使用XmlInclude属性，代码如下：

 

    [XmlInclude(typeof(B))]
    public abstract class A
    {
        public A()
        {

        }

        public A(int i)
        {
            this.i = i;
        }
        public int i;
    }

完成。希望对大家有帮助.