c#常用的Datable转换为json，以及json转换为DataTable操作方法_H5之家

1. [代码][C#]Datatable和json互相转换操作跳至 #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></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></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>获取需要转换的值</param> /// <param>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