.Net Newtonsoft.Json 转json时将枚举转为字符串

1：非列表类型枚举

[JsonConverter(typeof(StringEnumConverter))]
public SubjectTypeEnum subject_type { get; set; } = SubjectTypeEnum.SUBJECT_TYPE_ENTERPRISE;

2：列表类型枚举

[JsonProperty(ItemConverterType = typeof(StringEnumConverter))]
public List<SalesScenesTypeEnum> sales_scenes_type { get; set; } = new List<SalesScenesTypeEnum>();