.Net Core 配置之long类型 前端精度丢失和时间格式设置

需求：long类型的值大于9007199254740991值时，前端会失精度，由于表结构ID用的long类型，修改程序字段类型不现实，网管统一处理，将long类型大于9007199254740991值时改为sting类型

方案：

public class CustomContractResolver : DefaultContractResolver
    {
        /// <summary>
        /// 对长整型做处理
        /// </summary>
        /// <param name="objectType"></param>
        /// <returns></returns>
        protected override JsonConverter ResolveContractConverter(Type objectType)
        {
            if (objectType == typeof(long))
            {
                return new JsonConverterLong();
            }
            return base.ResolveContractConverter(objectType);
        }
    }

public class JsonConverterLong : JsonConverter
    {
       
        public override bool CanRead => false;
        /// <summary>
        /// 是否可以转换
        /// </summary>
        /// <param name="objectType"></param>
        /// <returns></returns>
        public override bool CanConvert(Type objectType)
        {
            return true;
        }

        /// <summary>
        /// 读json
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="objectType"></param>
        /// <param name="existingValue"></param>
        /// <param name="serializer"></param>
        /// <returns></returns>
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            //此方法不会进来，因为设置的上面CanRead是false
            return reader.Value;
        }

        /// <summary>
        /// 写json
        /// </summary>
        /// <param name="writer"></param>
        /// <param name="value"></param>
        /// <param name="serializer"></param>
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (value == null || Convert.ToInt64(value) < 9007199254740991)
                writer.WriteValue(value);
            else
                writer.WriteValue(value + "");
        }
    }

参考：

https://www.cnblogs.com/yijiayi/p/10051284.html

https://www.cnblogs.com/binbinxu/p/13061561.html