c#常用的Datable转换为json，以及json转换为DataTable操作方法

[1].[代码] [C#]Datatable和json互相转换操作 跳至 [1]
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          #region  DataTable 转换为Json字符串实例方法
    /// <summary>
   /// GetClassTypeJosn 的摘要说明
   /// </summary>
  public class GetClassTypeJosn : IHttpHandler
   {
       /// <summary>
       /// 文件名:DataTable 和Json 字符串互转
       /// 版权所有:Copyright (C) Create Family Wealth liangjw
       /// 创建标示：2013-08-03
       /// </summary>
      //用法说明实例
        public void ProcessRequest(HttpContext context)
        {
        context.Response.ContentType = "application/json";
          context.Response.Charset = "utf-8";
           HttpRequest req = context.Request;
           string method = req["method"].ToStr().ToLower();
    
  
         //获取合同明细列表  DataTable 转换为Json字符串
          if (method == "txtdate")
         {
               string json = "";
              BO.MakeContractMx bll = new MakeContractMx();
               DataSet ds = bll.GetDataTable();
              if (ds.Tables.Count > 0)
               {
                    json =ToJson(ds.Tables[0]);
               }
               context.Response.Write(json);
               return;
            }
  
       }
  
      public bool IsReusable
      {
            get
        {
               return false;
           }
       }
   }
    
       #endregion
   
       #region Json字符串转换为DataTable 实例方法
   
      public DataTable JsonToDataTable(json)
        {
           DataTable  dt= ToDataTable(json);
            return dt;
      }
     
      #endregion
 
       #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 static string ToJson(this 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].ToStr());
                }
                arrayList.Add(dictionary); //ArrayList集合中添加键值
            }
    
            return javaScriptSerializer.Serialize(arrayList);  //返回一个json字符串
        }
        #endregion
    
        #region Json 字符串 转换为 DataTable数据集合
        /// <summary>
        /// Json 字符串 转换为 DataTable数据集合
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static DataTable ToDataTable(this string json)
        {
            DataTable dataTable = new DataTable();  //实例化
            DataTable result;
            try
            {
                JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
                javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
                ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
                if (arrayList.Count > 0)
                {
                    foreach (Dictionary<string, object> dictionary in arrayList)
                    {
                        if (dictionary.Keys.Count<string>() == 0)
                        {
                            result = dataTable;
                            return result;
                        }
                        if (dataTable.Columns.Count == 0)
                        {
                            foreach (string current in dictionary.Keys)
                            {
                                dataTable.Columns.Add(current, dictionary[current].GetType());
                            }
                        }
                        DataRow dataRow = dataTable.NewRow();
                        foreach (string current in dictionary.Keys)
                        {
                            dataRow[current] = dictionary[current];
                        }
    
                        dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
                    }
                }
            }
           catch
            {
            }
            result = dataTable;
            return result;
        }
        #endregion
    
        #region 转换为string字符串类型
        /// <summary>
        ///  转换为string字符串类型
        /// </summary>
        /// <param name="s">获取需要转换的值</param>
        /// <param name="format">需要格式化的位数</param>
        /// <returns>返回一个新的字符串</returns>
        public static string ToStr(this object s, string format = "")
        {
            string result = "";
            try
            {
                if (format == "")
                {
                    result = s.ToString();
               }
                else
                {
                    result = string.Format("{0:" + format + "}", s);
                }
            }
            catch
            {
            }
            return result;
        }
       #endregion