DataTable 对象 转换为Json 字符串

   #region DataTable 转换为Json 字符串

        /// <summary>

        /// DataTable 对象 转换为Json 字符串

        /// </summary>

        /// <param name="dt"></param>

        /// <returns></returns>

        public string ToJson( DataTable dt)

        {

            JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();

            javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值

            ArrayList arrayList = new ArrayList();

            foreach (DataRow dataRow in dt.Rows)

            {

                Dictionary<string, object> dictionary = new Dictionary<string, object>();  //实例化一个参数集合

                foreach (DataColumn dataColumn in dt.Columns)

                {

                    dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToString());

                }

                arrayList.Add(dictionary); //ArrayList集合中添加键值

            }

            return javaScriptSerializer.Serialize(arrayList);  //返回一个json字符串

        }

        #endregion