常用的Datable转换为json，以及json转换为DataTable操代码,Asp.Net代码库,德仔网

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【Asp.Net】常用的Datable转换为json，以及json转换为DataTable操
作者:liangjw0504 / 发布于2015/9/22/ 830

	#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
试试其它关键字
　Datable转换为json　　json转换为DataTable　
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