使用Json.NET自定义反序列化 [英] Custom Deserialization using Json.NET

问题描述

我上课

public class Order
{
   public int Id { get; set; }
   public string ShippingMethod { get; set; }
}

我想将下面的JSON数据反序列化到上面的类/对象中

string json = @"{
  'Id': 1,
  'ShippingMethod': {
     'Code': 'external_DHLExpressWorldwide',
     'Description': 'DHL ILS Express Worldwide'
  }
}";

我的想法是JSON中的ShippingMethod是一个对象，但是我只想进入ShippingMethod.Code(在JSON中)，该对象将在反序列化期间作为string在Order类中传递给ShippingMethod. /p>

如何使用 Json.NET 来实现该目标?

我相信我可以使用 CustomJsonConverter 完成它.但是我很困惑.文档中的示例仅适用于WriteJson，而不适用于ReadJson.

解决方案

我只是使用 JsonConverter .在我完整的代码下面:

public class Order
{
    public int Id { get; set; }

    [JsonConverter(typeof(ShippingMethodConverter))]
    public string ShippingMethod { get; set; }
}

public class ShippingMethodConverter : JsonConverter
{

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException("Not implemented yet");
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
        {
            return string.Empty;
        } 
        else if (reader.TokenType == JsonToken.String)
        {
            return serializer.Deserialize(reader, objectType);
        }
        else
        {
            JObject obj = JObject.Load(reader);
            if (obj["Code"] != null) 
                return obj["Code"].ToString();
            else 
                return serializer.Deserialize(reader, objectType);
        }
    }

    public override bool CanWrite
    {
        get { return false; }
    }

    public override bool CanConvert(Type objectType)
    {
        return false;
    }
}

I have a class

public class Order
{
   public int Id { get; set; }
   public string ShippingMethod { get; set; }
}

and I want to deserialize a JSON data below into the above class/object

string json = @"{
  'Id': 1,
  'ShippingMethod': {
     'Code': 'external_DHLExpressWorldwide',
     'Description': 'DHL ILS Express Worldwide'
  }
}";

My idea is that ShippingMethod in JSON is a object, but I just want to get to ShippingMethod.Code (in JSON) that will pass into ShippingMethod as string in Order class during deserialization.

how can I accomplish that goal using Json.NET?

I believe I can accomlish it using CustomJsonConverter. But I get confused. The example in the docs just for WriteJson, but not ReadJson.

解决方案

I just resolve my problem using JsonConverter as I mentioned above in my question. Below my complete code:

public class Order
{
    public int Id { get; set; }

    [JsonConverter(typeof(ShippingMethodConverter))]
    public string ShippingMethod { get; set; }
}

public class ShippingMethodConverter : JsonConverter
{

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException("Not implemented yet");
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
        {
            return string.Empty;
        } 
        else if (reader.TokenType == JsonToken.String)
        {
            return serializer.Deserialize(reader, objectType);
        }
        else
        {
            JObject obj = JObject.Load(reader);
            if (obj["Code"] != null) 
                return obj["Code"].ToString();
            else 
                return serializer.Deserialize(reader, objectType);
        }
    }

    public override bool CanWrite
    {
        get { return false; }
    }

    public override bool CanConvert(Type objectType)
    {
        return false;
    }
}

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