搞来有搞去终于有了个结果，主要是一开始犯了一些低级错误。

对于json不太了解的童鞋，可以看看这个：

这个例子中主要是从数据库中读取数据，转换成JSON格式，传递给前端，废话少说上代码：

protected void Page_Load(object sender, EventArgs e)        {             string b = Request["callback"];            string name = Context.Request["name"];            //数据库操作            SqlConnection thisConnection = new SqlConnection("Data Source=localhost;Initial Catalog=commodities; uid=sa;Password=123");            string command = "select * from InterestStore where UserID = " + name;            SqlDataAdapter thisAdapter = new SqlDataAdapter(command, thisConnection);            SqlCommandBuilder thisCommandBuilder = new SqlCommandBuilder(thisAdapter);            DataSet thisDataSet = new DataSet();            thisAdapter.Fill(thisDataSet, "IStore");            //将数据表转换成JSON数据            string ss = GetJson(thisDataSet, "IStore");           //返回到前端            Response.Write(ss);            Response.End();//Response.End把前面的内容都输出了，阻止了后面html相关内容的输出        }

/// 
        /// 获取Json数据        /// 
        /// 数据集        /// 表名        /// 
            private string GetJson(DataSet dSet, string strTableName)        {            StringBuilder sBuilder = new StringBuilder();            sBuilder.Append("{");            //sBuilder.Append(" " + strTableName + ":{");            sBuilder.Append("\"" + strTableName +"\":[");            try {                for (int i = 0; i < dSet.Tables[strTableName].Rows.Count; i++)                {                    sBuilder.Append("{");                    for (int j = 0; j < dSet.Tables[strTableName].Columns.Count; j++)                    {                        sBuilder.AppendFormat("\"{0}\":\"{1}\",", dSet.Tables[strTableName].Columns[j].ColumnName, dSet.Tables[strTableName].Rows[i][j].ToString());                    }                    sBuilder.Remove(sBuilder.ToString().LastIndexOf(','), 1);                    sBuilder.Append("},");                }                sBuilder.Remove(sBuilder.ToString().LastIndexOf(','), 1);                sBuilder.Append("]");                sBuilder.Append("}");                //sBuilder.Append(" };");                return sBuilder.ToString();            }            catch (Exception es){                throw new Exception(es.Message);            }        }

前台返回的数据：

{"IStore":[{"SOIID":"1 ","UserID":"001 ","StoreID":"47 ","Attention":"10"},{"SOIID":"2 ","UserID":"001 ","StoreID":"77 ","Attention":"8"},{"SOIID":"3 ","UserID":"001 ","StoreID":"81 ","Attention":"8"},{"SOIID":"4 ","UserID":"001 ","StoreID":"42 ","Attention":"7"},{"SOIID":"5 ","UserID":"001 ","StoreID":"81 ","Attention":"6"},{"SOIID":"6 ","UserID":"001 ","StoreID":"114 ","Attention":"6"},{"SOIID":"7 ","UserID":"001 ","StoreID":"106 ","Attention":"8"},{"SOIID":"8 ","UserID":"001 ","StoreID":"116 ","Attention":"6"}]}

前台执行ajax调用的代码

xhr.get({                        //请求页面                        url: "WebForm3.aspx",                        //参数                        content: { name: sname },                        //数据格式                        handleAs: "json",                        //当执行成功时调用的方法                        load: function (newContent) {                            try {                                                                var str = newContent;                                console.log(str);                                console.log("ddddddddddddddddddd");                                console.log(dojo.toJson(str));                            }                            catch (err)                            { console.log(err); }                            //dom.byId("txtSuggestion").value = people.programmers[0].lastName;                            dom.byId("txtSuggestion").value = newContent.IStore[2].StoreID;                        },                        //失败时调用的方法                        error: function (err) {                            //alert("error");                            alert(err);                        }                    });