覆盖Json.Net中的默认原始类型处理 [英] Overriding Default Primitive Type Handling in Json.Net

问题描述

在处理原始类型时，是否有一种方法可以覆盖Json.net的默认反序列化行为?例如，当将json数组[3.14,10,"test"]反序列化为object[] 3.14 的类型为double且 10 的类型为long.无论如何，有没有办法我可以拦截或覆盖此类型决策，以便分别将值反序列化为decimal和int?

Is there a way to override the default deserialization behaviour of Json.net when handling primitive types? For example when deserializing the json array [3.14,10,"test"] to a type of object[] 3.14 will be of type double and 10 will be of type long. Is there anyway I can intercept or override this type decision so I could deserialize the values as decimal and int respectively?

我基本上总是希望json整数总是以int返回，并浮动为以decimal返回.这样可以省去一些在代码中将double转换为decimal的麻烦.

I basically always want json integers to always return as int and floats to return as decimal. This will save me some having to inject double to decimal conversions in my code.

我已经研究了扩展Newtonsoft.Json.Serialization.DefaultContractResolver并实现自己的Newtonsoft.Json.JsonConverter的方法，但是我还没有发现任何实现此所需覆盖的方法.

I've looked into extending Newtonsoft.Json.Serialization.DefaultContractResolver and implementing my own Newtonsoft.Json.JsonConverter but I have not discovered any way to implement this desired override.

要复制的示例代码

object[] variousTypes = new object[] {3.14m, 10, "test"};
string jsonString = JsonConvert.SerializeObject(variousTypes);
object[] asObjectArray = JsonConvert.DeserializeObject<object[]>(jsonString); // Contains object {double}, object {long}, object {string}

推荐答案

我认为这应该可行

public class MyReader : JsonTextReader
{
    public MyReader(string s) : base(new StringReader(s))
    {
    }

    protected override void SetToken(JsonToken newToken, object value)
    {
        object retObj = value;
        if (retObj is long) retObj = Convert.ChangeType(retObj, typeof(int));
        if (retObj is double) retObj = Convert.ChangeType(retObj, typeof(decimal));

        base.SetToken(newToken, retObj);
    }
}


object[] variousTypes = new object[] { 3.14m, 10, "test" };
string jsonString = JsonConvert.SerializeObject(variousTypes);

JsonSerializer serializer = new JsonSerializer();
var asObjectArray = serializer.Deserialize<object[]>(new MyReader(jsonString));

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