/// <summary>
 /// 将对象转换为json格式的字符串
 /// </summary>
 /// <typeparam name="T">对象类型</typeparam>
 /// <param name="obj"></param>
 /// <returns>json格式的字符串</returns>
 public static string ToJson <T>(this T obj)
 {
     return(NewtonsoftJsonSerializer.GetJsonByObj(obj));
 }