XMLSERIALIZE自定义集合与属性 [英] XmlSerialize a custom collection with an Attribute

问题描述

我有一个简单的类继承自Collection，并增加了一些特性。我需要序列化这个类XML，但是XmlSerializer的会忽略我的附加属性。

I've got a simple class that inherits from Collection and adds a couple of properties. I need to serialize this class to XML, but the XMLSerializer ignores my additional properties.

我想这是因为特殊的治疗，XMLSerializer的给人的ICollection和IEnumerable对象。什么是最好的方式解决此问题？

I assume this is because of the special treatment that XMLSerializer gives ICollection and IEnumerable objects. What's the best way around this?

下面是一些示例code：

Here's some sample code:

using System.Collections.ObjectModel;
using System.IO;
using System.Xml.Serialization;

namespace SerialiseCollection
{
    class Program
    {
        static void Main(string[] args)
        {
            var c = new MyCollection();
            c.Add("Hello");
            c.Add("Goodbye");

            var serializer = new XmlSerializer(typeof(MyCollection));
            using (var writer = new StreamWriter("test.xml"))
                serializer.Serialize(writer, c);
        }
    }

    [XmlRoot("MyCollection")]
    public class MyCollection : Collection<string>
    {
        [XmlAttribute()]
        public string MyAttribute { get; set; }

        public MyCollection()
        {
            this.MyAttribute = "SerializeThis";
        }
    }
}

该输出下面的XML（注意MyAttribute是在MyCollection的元素缺失）：

This outputs the following XML (note MyAttribute is missing in the MyCollection element):

<?xml version="1.0" encoding="utf-8"?>
<MyCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <string>Hello</string>
    <string>Goodbye</string>
</MyCollection>

我的需要的是

<MyCollection MyAttribute="SerializeThis" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <string>Hello</string>
    <string>Goodbye</string>
</MyCollection>

任何想法？越简单越好。谢谢你。

Any ideas? The simpler the better. Thanks.

推荐答案

类别一般不作额外性能好地方。无论是在序列化和数据绑定，如果该项目看起来像一个集合，他们将被忽略（的IList ，的IEnumerable ，等等 - 具体取决于该方案）

Collections generally don't make good places for extra properties. Both during serialization and in data-binding, they will be ignored if the item looks like a collection (IList, IEnumerable, etc - depending on the scenario).

如果是我，我会封装集合 - 即

If it was me, I would encapsulate the collection - i.e.

[Serializable]
public class MyCollectionWrapper {
    [XmlAttribute]
    public string SomeProp {get;set;} // custom props etc
    [XmlAttribute]
    public int SomeOtherProp {get;set;} // custom props etc
    public Collection<string> Items {get;set;} // the items
}

另一种选择是要落实的IXmlSerializable （相当多的工作），但仍然不能用于数据绑定等，基本上，这是不是预期使用。

The other option is to implement IXmlSerializable (quite a lot of work), but that still won't work for data-binding etc. Basically, this isn't the expected usage.

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