（转）把dataset数据转换成json的格式通用方法，支持多个table集

/// <summary>
        /// 把dataset数据转换成json的格式
        /// </summary>
        /// <param name="ds">dataset数据集</param>
        /// <returns>json格式的字符串</returns>
        public static string GetJsonByDataset(DataSet ds)
        {
            if (ds == null || ds.Tables.Count <= 0 || ds.Tables[0].Rows.Count <= 0)
            {
                //如果查询到的数据为空则返回标记ok:false
                return "{""ok"":false}";
            }
            StringBuilder sb = new StringBuilder();
            sb.Append("{""ok"":true,");
            foreach (DataTable dt in ds.Tables)
            {
                sb.Append(string.Format("""{0}"":[",dt.TableName));

                foreach (DataRow dr in dt.Rows)
                {
                    sb.Append("{");
                    for (int i = 0; i < dr.Table.Columns.Count; i++)
                    {
                        sb.AppendFormat("""{0}"":""{1}"",", dr.Table.Columns[i].ColumnName.Replace("""", """""").Replace(""'", """"'"), FieldTypeFilter.ObjToStr(dr[i]).Replace("""", """""").Replace(""'", """"'"));
                    }
                    sb.Remove(sb.ToString().LastIndexOf(','), 1);
                    sb.Append("},");
                }

                sb.Remove(sb.ToString().LastIndexOf(','), 1);
                sb.Append("],");
            }
            sb.Remove(sb.ToString().LastIndexOf(','), 1);
            sb.Append("}");
            return sb.ToString();
        }
相应的jQuery读取json方式

 $.getJSON("page.aspx",{process:'getinfo',idx:idx},function(json){
            if(json.ok==true){
                $("#slGameType").val(json.Table[0].GameType);
                $("#txtSelectName").val(json.Table[0].SelectName);
                $("#txtmyName").val(json.Table1[0].myName);
                 $("#txtmyinfo").val(json.Table1[0].info);
           }
        });