/// <summary>    /// JSON帮助类。用于将对象转换为Json格式的字符串，或者将Json的字符串转化为对象。    /// </summary>    public static class JsonHelper    {        /// <summary>        /// 将对象转化为Json字符串         /// </summary>        /// <typeparam name="T">源类型</typeparam>        /// <param name="obj">源类型实例</param>        /// <returns>Json字符串</returns>        public static string GetJsonFromObj<T>(T obj)        {            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());            using (MemoryStream ms = new MemoryStream())            {                jsonSerializer.WriteObject(ms, obj);                return Encoding.UTF8.GetString(ms.ToArray());            }        }        /// <summary>        /// 将Json字符串转化为对象        /// </summary>        /// <typeparam name="T">目标类型</typeparam>        /// <param name="strJson">Json字符串</param>        /// <returns>目标类型的一个实例</returns>        public static T GetObjFromJson<T>(string strJson)        {            T obj = Activator.CreateInstance<T>();            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson)))            {                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());                return (T)jsonSerializer.ReadObject(ms);            }        }        /// <summary>        /// 将DataTable转换为JSON字符串        /// </summary>        /// <param name="dt">数据表</param>        /// <returns>JSON字符串</returns>        public static string GetJsonFromDataTable(DataTable dt)        {            StringBuilder JsonString = new StringBuilder();            if (dt != null && dt.Rows.Count > 0)            {                JsonString.Append("{ ");                JsonString.Append("\"TableInfo\":[ ");                for (int i = 0; i < dt.Rows.Count; i++)                {                    JsonString.Append("{ ");                    for (int j = 0; j < dt.Columns.Count; j++)                    {                        if (j < dt.Columns.Count - 1)                        {                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");                        }                        else if (j == dt.Columns.Count - 1)                        {                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");                        }                    }                    if (i == dt.Rows.Count - 1)                    {                        JsonString.Append("} ");                    }                    else                    {                        JsonString.Append("}, ");                    }                }                JsonString.Append("]}");                return JsonString.ToString();            }            else            {                return null;            }        }        /// <summary>         /// 将对象转化为Json字符串         /// </summary>         /// <param name="obj">源对象</param>         /// <returns>json数据</returns>         public static string ObjToJson(this object obj)        {            JavaScriptSerializer serialize = new JavaScriptSerializer();            return serialize.Serialize(obj);        }        /// <summary>         /// 将Json字符串转化为对象        /// </summary>         /// <param name="strJson">Json字符串</param>         /// <returns>目标对象</returns>        public static T JsonToObj<T>(string strJson)        {            JavaScriptSerializer serialize = new JavaScriptSerializer();            return serialize.Deserialize<T>(strJson);        }        /// <summary>         /// 将对象转化为Json字符串(控制深度 )        /// </summary>         /// <param name="obj">源对象</param>         /// <param name="recursionDepth">深度</param>         /// <returns>json数据</returns>         public static string ObjToJson(this object obj, int recursionDepth)        {            JavaScriptSerializer serialize = new JavaScriptSerializer();            serialize.RecursionLimit = recursionDepth;            return serialize.Serialize(obj);        }        /// <summary>         /// 将Json字符串转化为对象(控制深度 )        /// </summary>         /// <param name="strJson">Json字符串</param>         /// <param name="recursionDepth">深度</param>         /// <returns>目标对象</returns>        public static T JsonToObj<T>(string strJson, int recursionDepth)        {            JavaScriptSerializer serialize = new JavaScriptSerializer();            serialize.RecursionLimit = recursionDepth;            return serialize.Deserialize<T>(strJson);        }        /// <summary>         /// 将DataTable转换为JSON字符串        /// </summary>         /// <param name="dt">DataTable</param>         /// <returns>json数据</returns>         public static string DataTableToJson(DataTable dt)        {            Dictionary<string, object> dic = new Dictionary<string, object>();            int index = 0;            foreach (DataRow dr in dt.Rows)            {                Dictionary<string, object> result = new Dictionary<string, object>();                foreach (DataColumn dc in dt.Columns)                {                    result.Add(dc.ColumnName, dr[dc].ToString());                }                dic.Add(index.ToString(), result);                index++;            }            return ObjToJson(dic);        }    }