的ISet＆LT; T＆GT;序列化使用DataContractJsonSerializer JSON [英] ISet<T> serialization to JSON using DataContractJsonSerializer

问题描述

我做了一些测试，以检查/理解JSON序列化到/从.NET类型在C＃。 我试图用DataContractJsonSerializer。

I am doing some tests to check/understand JSON serialization to/from .Net types in C#. I am trying to use the DataContractJsonSerializer.

下面是我想序列化样品类型：

Here is a sample type that I am trying to serialize:

[DataContract]
[KnownType(typeof(HashSet<int>))]
public class TestModel
{
    [DataMember]
    public string StreetName { get; private set; }
    [DataMember]
    public int StreetId { get; private set; }
    [DataMember]
    public int NumberOfCars { get; set; }
    [DataMember]
    public IDictionary<string, string> HouseDetails { get; set; }
    [DataMember]
    public IDictionary<int, string> People { get; set; }
    [DataMember]
    public ISet<int> LampPosts { get; set; }

    public TestModel(int StreetId, string StreetName)
    {
        this.StreetName = StreetName;
        this.StreetId = StreetId;

        HouseDetails = new Dictionary<string, string>();
        People = new Dictionary<int, string>();
        LampPosts = new HashSet<int>();
    }

    public void AddHouse(string HouseNumber, string HouseName)
    {
        HouseDetails.Add(HouseNumber, HouseName);
    }

    public void AddPeople(int PersonNumber, string PersonName)
    {
        People.Add(PersonNumber, PersonName);
    }

    public void AddLampPost(int LampPostName)
    {
        LampPosts.Add(LampPostName);
    }
}

当我再尝试序列这种类型的使用DataContractJsonSerializer一个对象，我得到以下错误：

When I then try to serialize an object of this type using DataContractJsonSerializer, I get the following error:

{"'System.Collections.Generic.HashSet`1[System.Int32]' is a collection type and cannot be serialized when assigned to an interface type that does not implement IEnumerable ('System.Collections.Generic.ISet`1[System.Int32]'.)"}

这条消息听起来是不是我的权利。 的ISet＆LT; T＆GT; 并实施的IEnumerable＆LT; T＆GT; （也IEnumerable的）。 如果我TestModel课，我替换

This msg does not sound right to me. ISet<T> does implement IEnumerable<T>( and also IEnumerable). If in my TestModel class, I replace

public ISet<int> LampPosts { get; set; }

与

public ICollection<int> LampPosts { get; set; }...

则全部通过帆。

then it all sails through.

我是新来的JSON所以任何帮助将是pciated大大AP $ P $

I am new to JSON so any help would be greatly appreciated

推荐答案

看起来这是一个<一个href="https://connect.microsoft.com/VisualStudio/feedbackdetail/view/797718/datacontractserializer-cannot-serialize-system-collections-generic-iset-t-even-if-it-derives-from-ienumerable"相对=nofollow> Microsoft已知的bug 。 支持的接口列表是很难codeD的框架，而的ISet 是不是其中之一：

Looks like this is a known microsoft bug. List of supported interfaces is hardcoded in framework, and ISet is not one of them:

CollectionDataContract.CollectionDataContractCriticalHelper._knownInterfaces = new Type[]
{
  Globals.TypeOfIDictionaryGeneric,
  Globals.TypeOfIDictionary,
  Globals.TypeOfIListGeneric,
  Globals.TypeOfICollectionGeneric,
  Globals.TypeOfIList,
  Globals.TypeOfIEnumerableGeneric,
  Globals.TypeOfICollection,
  Globals.TypeOfIEnumerable
};

是的，错误信息是不正确。 因此， DataContractJsonSerializer 不能序列的ISet 的接口，它应该是一个支持的接口，或用水泥<替换code>的ISet 的实施。

And yes, error message is incorrect. So, DataContractJsonSerializer cannot serialize ISet interface, it should be either replaced with one of supported interfaces, or with concrete ISet implementation.

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