Newtonsoft.Json正确序列化解决大数字问题

Json大数字在前端解析会丢失精度,解决办法为转为文本绕过JS在JSON转换中无Int64转换器的尴尬.

重载一个转换器

    /// 
    /// 大数字序列化器
    /// 
    public class JsonNumberConverter : JsonConverter
    {
        private readonly Type[] _types;
        /// 
        /// 
        /// 
        /// 
        public JsonNumberConverter(params Type[] types)
        {
            this._types = types;
        }

        /// 
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            JToken t = JToken.FromObject(value);

            if (t.Type == JTokenType.Integer)
            {
                writer.WriteValue(value.ToString());
            }
            else
            {
                t.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 => false;

        /// 
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(long) || objectType == typeof(decimal);
        }
    }

重点有两处:

  1. bool CanConvert(Type objectType)方法中指定long与decimal参与
  2. WriteJson方法中使用writer.WriteValue(value.ToString());即可转换为文本

使用

JsonConvert.SerializeObject(result, new JsonNumberConverter());

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