如何使用XmlSerializer的序列化Object类型的属性 [英] How to serialize property of type Object with XmlSerializer

问题描述

我有一个属性：

public object Tag

但它可以包含有限数量的类型，可惜没有基本类型（除对象类型）。但是，当我序列化这个属性的对象，它不会序列化。有没有一种方法来指示XmlSerializer的可能的类型？

but it can contain finite number of types, unfortunately without base type (except object type). But when I serialize the object with this property, it doesn't get serialized. Is there a way to instruct XmlSerializer with possible types?

推荐答案

我不建议这样做，但是，是的，你可以使用 [的XmlElement] 等来告诉它为成员有关多个候选类型：

I don't recommend this, but yes, you can use [XmlElement] etc to tell it about multiple candidate types for a member:

public class Test
{
    private static void Main()
    {
        var ser = new XmlSerializer(typeof (Test));
        var obj = new Test {Value = "abc"};
        ser.Serialize(Console.Out, obj);
        obj = new Test { Value = 123 };
        ser.Serialize(Console.Out, obj);
        obj = new Test { Value = 456.7F };
        ser.Serialize(Console.Out, obj);
    }

    [XmlElement("a", Type = typeof(int))]
    [XmlElement("b", Type = typeof(string))]
    [XmlElement("c", Type = typeof(float))]
    public object Value { get; set; }
}

输出的重要位（忽略所有的xmlns / ＆LT; XML＆GT; 等？）是：

The important bits of the output (ignoring all the xmlns / <?xml> etc) are:

<Test>
  <b>abc</b>
</Test>

<Test>
  <a>123</a>
</Test>

<Test>
  <c>456.7</c>
</Test>

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