DTCMS使用ajax局部刷新

动力启航的DTCMS代码遇到的问题：

前台post请求：

$.ajax({
                type: "POST",
                url: sendUrl,
                dataType: "json",
                timeout: 20000,
               
                success: function (data) {

                    if (data != null) {
                        $("#ul").html("");
                        for (var i = 0; i < data.json_data.length; i++) {
                            var item = data.json_data[i];
                            var tobody = "";
                           
                            $(ul).append(tobody);
                        }

                    };
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    alert(textStatus);
                }
            });

后台转换为JSON格式：

/// <summary>  
        /// DataTable to json  
        /// </summary>  
        /// <param name="jsonName">返回json的名称</param>  
        /// <param name="dt">转换成json的表</param>  
        /// <returns></returns>  
        public static string DataTableToJson(DataTable dt, string pagelist)
        {
            StringBuilder JsonString = new StringBuilder();

            if (dt != null && dt.Rows.Count > 0)
            {
                JsonString.Append("{ ");
                JsonString.Append("\"json_data\":[ ");
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    JsonString.Append("{ ");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j < dt.Columns.Count - 1 && j!=11)
                        {
                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString().Replace("\"", "\\\"") + "\":" + "\"" + dt.Rows[i][j].ToString().Replace("\"", "\\\"") + "\",");
                        }
                        else if (j == dt.Columns.Count - 1)
                        {
                            JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString().Replace("\"", "\\\"") + "\":" + "\"" + dt.Rows[i][j].ToString().Replace("\"", "\\\"") + "\"");
                        }
                    }
                    if (i == dt.Rows.Count - 1)
                    {
                        JsonString.Append("} ");
                    }
                    else
                    {
                        JsonString.Append("}, ");
                    }


                }
                JsonString.Append("], ");
                JsonString.Append("\"pagelist\":[{ \"pagelist\":");
                JsonString.Append("\"" + pagelist.Replace("\"", "\'") + "\"");
                JsonString.Append("}");
                JsonString.Append("]");
                JsonString.Append("}");
                return JsonString.ToString();
            }
            else
            {
                return null;
            }
        }

转换为json格式时的调用：

string json；
json = DataTableToJson(dt,pagelist);

其中ds 为datatable类型的。