C# newtonsoft序列化将long类型转化为字符串

/// <summary>
/// 转化为json的时候long类型转为string
/// </summary>
public class LongJsonConverter: JsonConverter
{public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer){try{return reader.Value.ObjToLong();}catch (Exception ex){throw ex;}}public override bool CanConvert(Type objectType){return true;}public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer){if (value == null){writer.WriteNull();return;}string sValue = value.ToString();writer.WriteValue(sValue);}
}

全局使用

services.AddControllers(options =>
{//添加过滤器//options.Filters.Add(new AdminIpFilter(Configuration));
}).AddNewtonsoftJson(options =>{options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;options.SerializerSettings.Converters.Add(new Common.NewtonsoftJsonConvert.LongNullConverter());//修改属性名称的序列化方式，首字母小写options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();//修改时间的序列化方式options.SerializerSettings.Converters.Add(new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" });//看这里options.SerializerSettings.Converters.Add(new LongJsonConverter());});

针对某个属性使用

[JsonConverter(typeof(LongJsonConverter))]
public long? Id { get; set; }