xml使用其泛型类型序列化泛型类 [英] xml serialize a generic class with it's generic types

问题描述

我需要将包含Pair<T,U>类型的对象的列表序列化为xml.除了这些值，我还需要序列化其泛型的类型(T和U的类型).

I need to serialize to xml a list containing objects of type Pair<T,U>. Along with those values, I would also need to serialize the type of it's generics(the type ofT and U).

首先，我创建了一个PairList类来保存对的列表，然后我创建了一个实际的类，该类代表一对两个值，键和值.

First, I've created a class PairList to hold the list of the pairs and then I've created the actual class which represents a pair of two values, key and value.

 [XmlRoot("pairList")]
        public class PairList<T,U>{
            [XmlElement("element")]
            public List<Pair<T,U>> list;
            public PairList()
            {
                list = new List<Pair<T, U>>();
            }

        }
        public class Pair<T, U>
        {
            [XmlAttribute("key")]
            public T key;
            [XmlAttribute("value")]
            public U value;
            [XmlAttribute("T-Type")]
            public Type ttype;
            [XmlAttribute("U-Type")]
            public Type utype;

            public Pair()
            {
            }
            public Pair(T t, U u)
            {
                key = t;
                value = u;
                ttype = typeof(T);
                utype = typeof(U);
            }
        }

然后，我尝试将其序列化:

Then, I tried serializing it:

 PairList<string,int> myList = new PairList<string,int>();
            myList.list.Add(new Pair<string, int>("c", 2));
            myList.list.Add(new Pair<string, int>("c", 2));
            myList.list.Add(new Pair<string, int>("c", 2));
            myList.list.Add(new Pair<string, int>("c", 2));
            try
            {
                XmlSerializer serializer = new XmlSerializer(typeof(PairList<string, int>));
                TextWriter tw = new StreamWriter("list.xml");
                serializer.Serialize(tw, myList);
                tw.Close();
            }
            catch (Exception xe)
            {
                MessageBox.Show(xe.Message);
            }

不幸的是，我遇到一个例外:There was an error reflecting type: PairList[System.String,System.Int32].欢迎提供关于如何避免此异常并序列化类的任何想法.

Unfortunately I am getting an exception: There was an error reflecting type: PairList[System.String,System.Int32]. Any ideas on how I could avoid this exception and serialize the class are welcome.

如果我选择不对ttype和utype字段进行序列化(通过将它们设置为保护或私有)，则序列化将起作用.我不知道为什么它不想序列化Type字段.

If I choose not to serialize the ttype and utype fields(by making them protected or private) the serialization works. I can't figure out why it doesn't want to serialize the Type fields.

推荐答案

将您的班级更改为

public class Pair<T, U>
{
    [XmlAttribute("key")]
    public T key;
    [XmlAttribute("value")]
    public U value;
    [XmlAttribute("T-Type")]
    public string ttype;
    [XmlAttribute("U-Type")]
    public string utype;

    public Pair()
    {
    }
    public Pair(T t, U u)
    {
        key = t;
        value = u;
        ttype = typeof(T).ToString();
        utype = typeof(U).ToString();
    }
}

，它应该可以工作.您不能使用Xmlserializer序列化/反序列化Type.(例如，假设T是在外部程序集中定义的复杂对象，并且该程序集在您要反序列化的计算机上不存在)

and it should work. You can not serialize/deserialize Type with Xmlserializer.(For example, suppose T is a complex object defined in an external assembly and this assembly does not exist on the computer where you want to deserialize)

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