DataContractSerializer的序列化不是类的成员，它继承了ISerializable [英] DataContractSerializer not Serializing member of class that inherits ISerializable

问题描述

我有这个类：

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;

namespace Grouping
{
    [Serializable]
    public class Group<T> : HashSet<T>
    {
        public Group(string name)
        {
            this.name = name;
        }

        protected Group(){}

        protected Group(SerializationInfo info, StreamingContext context):base(info,context)
        {
            name = info.GetString("koosnaampje");
        }

        public override void GetObjectData(SerializationInfo info,StreamingContext context)
        {
            base.GetObjectData(info,context);
            info.AddValue("koosnaampje", Name);
        }

        private string name;
        public string Name
        {
            get { return name; }
            private set { name = value; }
        }
    }
}

当它从HashSet的继承它必须实现ISerializable的，因此受保护的构造和GetObjectData方法。 以前我和序列化与反序列化的BinaryFormatter该类成功地。

As it inherits from HashSet it has to implement ISerializable, hence the protected constructor and GetObjectData method. Formerly I serialized and deserialized this class succesfully with the BinaryFormatter.

由于我希望能够检查由我想切换到DataContractSerializer的序列化生成的输出。

Because I want to be able to inspect the output that is generated by the serializer I want to switch to the DataContractSerializer.

我写这篇测试：

[TestMethod]
public void SerializeTest()
{
    var group = new Group<int>("ints"){1,2,3};
    var serializer = new DataContractSerializer(typeof (Group<int>));
    using (var stream=File.OpenWrite("group1.xml"))
    {
        serializer.WriteObject(stream,group);
    }
    using (var stream=File.OpenRead("group1.xml"))
    {
        group = serializer.ReadObject(stream) as Group<int>;
    }
    Assert.IsTrue(group.Contains(1));
    Assert.AreEqual("ints",group.Name);
}

测试失败，因为Name属性为空！ （整数是序列化的（de）正确虽然） 这是怎么回事？

The test fails because the Name property is null! (the integers are (de)serialized correctly though) What is happening?

编辑：这无关名为支持字段是私有的。使之成为公众有相同的结果。

it has nothing to do with the name backing field being private. Making it public has the same result.

推荐答案

这是无关 ISerializable的; 的DataContractSerializer 根本就不使用 ISerializable的（它会使用的IXmlSerializable ，但你不想这样做...）

This is nothing to do with ISerializable; DataContractSerializer simply doesn't use ISerializable (it will use IXmlSerializable, but you don't want to do that...)

大多数串行化器，包括的XmlSerializer 和的DataContractSerializer （和数据绑定，对于这个问题），治疗集合为不同的实体。它可以是一个或其他，但不能两者兼得。因为它检测到它是一个集，它系列化的内容（即无论是在设置），而不是属性（名称等）。

Most serializers, including XmlSerializer and DataContractSerializer (and data-binding, for that matter), treat collections as different to entities. It can be one or the other, but not both. Because it detects that it is a "collection", it serializes the contents (i.e. whatever is in the set), not the properties (Name etc).

您应该的封装的集合，而不是继承的吧。

You should encapsulate a collection, rather than inherit it.

此外，正确使用的DataContractSerializer ，这将是明智的添加 [数据成员] / [DataContract ] 属性。例如：

Also; to correctly use DataContractSerializer, it would be wise to add the [DataMember]/[DataContract] attributes. For example:

[Serializable, DataContract] // probably don't need [Serializable]
public class Group<T>
{
    [DataMember]
    public HashSet<T> Items { get; private set; }

    protected Group()
    {
        Items = new HashSet<T>();
    }
    public Group(string name) : this()
    {
        Name = name;
    }
    [DataMember]
    public string Name {get ;private set;}
}

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