如何在使用 JSON.Net 进行序列化期间有条件地忽略字段和属性?

How to Ignoring Fields and Properties Conditionally During Serialization Using JSON.Net?(如何在使用 JSON.Net 进行序列化期间有条件地忽略字段和属性?)

问题描述

如何在使用 JSON.Net 进行序列化期间有条件地忽略字段和属性?我不能从 JsonIgnoreAttribute 继承，因为它是一个 sealed 类.我该怎么办?

How to Ignoring Fields and Properties Conditionally During Serialization Using JSON.Net? I can't inherit from JsonIgnoreAttribute because it's a sealed class. What should I do?

推荐答案

我找到了答案.我从 JsonConverter 继承并创建一个新的转换器.

I found the answer. I inherit from JsonConverter and create a new convertor.

public class CustomJsonConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var list = (IList)value;

        JArray s = new JArray();

        foreach (var item in list)
        {
            JToken token = JToken.FromObject(item);
            JObject obj = new JObject();

            foreach (JProperty prop in token)
            {
                if (prop.Name != "Title") // your logic here
                    obj.Add(prop);
            }

            s.Add(obj);
        }

        s.WriteTo(writer);

    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException("Unnecessary because CanRead is false. The type will skip the converter.");
    }

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

    public override bool CanConvert(Type objectType)
    {
        return objectType != typeof(IList);
    }
}

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