【轉載】C#工具類：Json操作幫助類

Json序列化和反序列化在程式開發中時常會遇到，在C#中可以使用很多種方法實現對數據的Json序列化和反序列化，封裝一個Json操作工具類來簡化相應的操作，該工具類中包含以下功能：對象轉JSON、數據表轉鍵值對集合、數據集轉鍵值對數組字典 、數據表轉JSON、JSON文本轉對象(泛型方法)、將JSON文本轉換為數據表數據、將JSON文本轉換成數據行、將json轉換為DataTable等。

封裝後的工具幫助類如下：

    /// <summary>
    /// JSON幫助類
    /// </summary>
    public class JsonHelper
    {
        /// <summary> 
        /// 對象轉JSON 
        /// </summary> 
        /// <param name="obj">對象</param> 
        /// <returns>JSON格式的字元串</returns> 
        public static string ObjectToJSON(object obj)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            try
            {
                byte[] b = Encoding.UTF8.GetBytes(jss.Serialize(obj));
                return Encoding.UTF8.GetString(b);
            }
            catch (Exception ex)
            {
                throw new Exception("JSONHelper.ObjectToJSON(): " + ex.Message);
            }
        }
        /// <summary> 
        /// 數據表轉鍵值對集合
        /// 把DataTable轉成 List集合, 存每一行 
        /// 集合中放的是鍵值對字典,存每一列 
        /// </summary> 
        /// <param name="dt">數據表</param> 
        /// <returns>哈希表數組</returns> 
        public static List<Dictionary<string, object>> DataTableToList(DataTable dt)
        {
            List<Dictionary<string, object>> list
                 = new List<Dictionary<string, object>>();
            foreach (DataRow dr in dt.Rows)
            {
                Dictionary<string, object> dic = new Dictionary<string, object>();
                foreach (DataColumn dc in dt.Columns)
                {
                    dic.Add(dc.ColumnName, dr[dc.ColumnName]);
                }
                list.Add(dic);
            }
            return list;
        }
        /// <summary> 
        /// 數據集轉鍵值對數組字典 
        /// </summary> 
        /// <param name="dataSet">數據集</param> 
        /// <returns>鍵值對數組字典</returns> 
        public static Dictionary<string, List<Dictionary<string, object>>> DataSetToDic(DataSet ds)
        {
            Dictionary<string, List<Dictionary<string, object>>> result = new Dictionary<string, List<Dictionary<string, object>>>();
            foreach (DataTable dt in ds.Tables)
                result.Add(dt.TableName, DataTableToList(dt));
            return result;
        }
        /// <summary> 
        /// 數據表轉JSON 
        /// </summary> 
        /// <param name="dataTable">數據表</param> 
        /// <returns>JSON字元串</returns> 
        public static string DataTableToJSON(DataTable dt)
        {
            return ObjectToJSON(DataTableToList(dt));
        }
        /// <summary> 
        /// JSON文本轉對象,泛型方法 
        /// </summary> 
        /// <typeparam name="T">類型</typeparam> 
        /// <param name="jsonText">JSON文本</param> 
        /// <returns>指定類型的對象</returns> 
        public static T JSONToObject<T>(string jsonText)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            try
            {
                return jss.Deserialize<T>(jsonText);
            }
            catch (Exception ex)
            {
                throw new Exception("JSONHelper.JSONToObject(): " + ex.Message);
            }
        }
        /// <summary> 
        /// 將JSON文本轉換為數據表數據 
        /// </summary> 
        /// <param name="jsonText">JSON文本</param> 
        /// <returns>數據表字典</returns> 
        public static Dictionary<string, List<Dictionary<string, object>>> TablesDataFromJSON(string jsonText)
        {
            return JSONToObject<Dictionary<string, List<Dictionary<string, object>>>>(jsonText);
        }
        /// <summary> 
        /// 將JSON文本轉換成數據行 
        /// </summary> 
        /// <param name="jsonText">JSON文本</param> 
        /// <returns>數據行的字典</returns>
        public static Dictionary<string, object> DataRowFromJSON(string jsonText)
        {
            return JSONToObject<Dictionary<string, object>>(jsonText);
        }
        /// <summary>
        /// 將json轉換為DataTable
        /// </summary>
        /// <param name="strJson">得到的json</param>
        /// <returns></returns>
        public static DataTable JsonToDataTable(string strJson)
        {
            //轉換json格式
            strJson = strJson.Replace(",\"", "*\"").Replace("\":", "\"#").ToString();
            //取出表名   
            var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);
            string strName = rg.Match(strJson).Value;
            DataTable tb = null;
            //去除表名   
            strJson = strJson.Substring(strJson.IndexOf("[") + 1);
            strJson = strJson.Substring(0, strJson.IndexOf("]"));
            //獲取數據   
            rg = new Regex(@"(?<={)[^}]+(?=})");
            MatchCollection mc = rg.Matches(strJson);
            for (int i = 0; i < mc.Count; i++)
            {
                string strRow = mc[i].Value;
                string[] strRows = strRow.Split('*');
                //創建表   
                if (tb == null)
                {
                    tb = new DataTable();
                    tb.TableName = strName;
                    foreach (string str in strRows)
                    {
                        var dc = new DataColumn();
                        string[] strCell = str.Split('#');
                        if (strCell[0].Substring(0, 1) == "\"")
                        {
                            int a = strCell[0].Length;
                            dc.ColumnName = strCell[0].Substring(1, a - 2);
                        }
                        else
                        {
                            dc.ColumnName = strCell[0];
                        }
                        tb.Columns.Add(dc);
                    }
                    tb.AcceptChanges();
                }
                //增加內容   
                DataRow dr = tb.NewRow();
                for (int r = 0; r < strRows.Length; r++)
                {
                    dr[r] = strRows[r].Split('#')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");
                }
                tb.Rows.Add(dr);
                tb.AcceptChanges();
            }
            return tb;
        }
    }

備註：原文轉載自C#工具類：Json操作幫助類_IT技術小趣屋。