DataTable转换成json字符串

将DataTable里面的行转换成json字符串方法：

         #region DataTable转为json
         /// <summary>
         /// DataTable转为json
         /// </summary>
         /// <param name="dt">DataTable</param>
         /// <returns>json数据</returns>
         public static string DataTableToJson(DataTable dt)
         {
             List<Dictionary<string, object>> list = (from DataRow dr in dt.Rows select dt.Columns.Cast<DataColumn>().ToDictionary(dc => dc.ColumnName, dc => dr[dc])).ToList();
             return SerializeToJson(list);
         }
         #endregion

         #region 序列化对象为Json字符串
         /// <summary>
         /// 序列化对象为Json字符串
         /// </summary>
         /// <param name="obj">要序列化的对象</param>
         /// <param name="recursionLimit">序列化对象的深度，默认为100</param>
         /// <returns>Json字符串</returns>
         public static string SerializeToJson(object obj, int recursionLimit = )
         {
             try
             {
                 System.Web.Script.Serialization.JavaScriptSerializer serialize = new System.Web.Script.Serialization.JavaScriptSerializer();
                 serialize.RecursionLimit = recursionLimit;
                 return serialize.Serialize(obj);
             }
             catch { return ""; }
         }
         #endregion

         #region json包转DataTable
         /// <summary>
         /// json包转DataTable
         /// </summary>
         /// <param name="jsons"></param>
         /// <returns></returns>
         public static DataTable JsonToDataTable(string jsons)
         {
             DataTable dt = new DataTable();
             try
             {
                 System.Web.Script.Serialization.JavaScriptSerializer serialize = new System.Web.Script.Serialization.JavaScriptSerializer();
                 serialize.MaxJsonLength = Int32.MaxValue;
                 ArrayList list = serialize.Deserialize<ArrayList>(jsons);
                 if (list.Count > )
                 {
                     foreach (Dictionary<string, object> item in list)
                     {
                         if (item.Keys.Count == )//无值返回空
                         {
                             return dt;
                         }
                         if (dt.Columns.Count == )//初始Columns
                         {
                             foreach (string current in item.Keys)
                             {
                                 dt.Columns.Add(current, item[current].GetType());
                             }
                         }
                         DataRow dr = dt.NewRow();
                         foreach (string current in item.Keys)
                         {
                             dr[current] = item[current];
                         }
                         dt.Rows.Add(dr);
                     }
                 }
             }
             catch
             {
                 return dt;
             }
             return dt;
         }
         #endregion