c# - 如何使用 Newtonsoft JSON.NET 将 JSON 反序列化为 IEnumerable

Question

给定这个 JSON:

[
  {
    "$id": "1",
    "$type": "MyAssembly.ClassA, MyAssembly",
    "Email": "me@here.com",
  },
  {
    "$id": "2",
    "$type": "MyAssembly.ClassB, MyAssembly",
    "Email": "me@here.com",
  }
]

和这些类:

public abstract class BaseClass
{
    public string Email;
}
public class ClassA : BaseClass
{
}
public class ClassB : BaseClass
{
}

如何将 JSON 反序列化为:

IEnumerable<BaseClass> deserialized;

我不能使用 JsonConvert.Deserialize<IEnumerable<BaseClass>>()因为它提示 BaseClass是抽象的。

Answer 1

你需要:

JsonSerializerSettings settings = new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.All
};

string strJson = JsonConvert.SerializeObject(instance, settings);

所以 JSON 看起来像这样:

{
  "$type": "System.Collections.Generic.List`1[[MyAssembly.BaseClass, MyAssembly]], mscorlib",
  "$values": [
    {
      "$id": "1",
      "$type": "MyAssembly.ClassA, MyAssembly",
      "Email": "me@here.com",
    },
    {
      "$id": "2",
      "$type": "MyAssembly.ClassB, MyAssembly",
      "Email": "me@here.com",
    }
  ]
}

然后你可以反序列化它:

BaseClass obj = JsonConvert.DeserializeObject<BaseClass>(strJson, settings);

文档:TypeNameHandling setting