Asp.net Jquery Ajax JSON数据读取不起作用

我试图从SQL server DB中检索数据并将其转换为JSON，并尝试使用JQuery Ajax函数显示JSON数据，下面是C代码

C#

GetJSONString（dTable）函数工作正常，下面是JQuery代码

jQuery&HTML

    <form id="form1" runat="server">
    <div>
        <h1>JSON Sample</h1>
        <button id="getdata">Get Data</button>
        <div id="company"></div>
<%--        <asp:Button ID="aspbutton" runat="server" Text=".Net Call" OnClick="btnOn_Click" />
        <asp:GridView runat="server" ID="grdview"></asp:GridView>--%>
    </div>
    <script type="text/javascript">        
        $(document).ready(function () {
            $("#getdata").click(function () {                
                $.ajax({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    data: "",
                    url: "Default.aspx/GetData",
                    dataType: "json",
                    success: function (data) {
                        alert(data.d);
                        $("#company").html(data.d);
                    }
                });
            });
        });
    </script>
    </form>

JSON示例
获取数据
$（文档）.ready（函数（）{
$（“#getdata”）。单击（函数（）{
$.ajax({
类型：“POST”，
contentType:“应用程序/json；字符集=utf-8”，
数据：“，
url:“Default.aspx/GetData”，
数据类型：“json”，
成功：功能（数据）{
警报（数据d）；
$（“#公司”）.html（data.d）；
}
});
});
});

我已经包括了jQuery文件，如果我有任何错误，请告诉我

编辑：添加了GetJSONString

公共静态字符串GetJSONString（DataTable Dt） { string[]StrDc=新字符串[Dt.Columns.Count]； string HeadStr=string.Empty

    for (int i = 0; i < Dt.Columns.Count; i++)
    {
        StrDc[i] = Dt.Columns[i].Caption;
        HeadStr += "\"" + StrDc[i] + "\" : \"" + StrDc[i] + i.ToString() + "¾" + "\",";
    }


    HeadStr = HeadStr.Substring(0, HeadStr.Length - 1);


    StringBuilder Sb = new StringBuilder();
    Sb.Append("{\"" + Dt.TableName + "\" : [");


    for (int i = 0; i < Dt.Rows.Count; i++)
    {
        string TempStr = HeadStr;
        Sb.Append("{");


        for (int j = 0; j < Dt.Columns.Count; j++)
        {
            switch (Dt.Columns[j].DataType.ToString())
            {
                case "System.DateTime":
                    DateTime cv = (DateTime)Dt.Rows[i][j];
                    TempStr = TempStr.Replace(Dt.Columns[j] + j.ToString() + "¾", cv.Year + "," + (cv.Month - 1) + "," + cv.Day + "," + cv.Hour + "," + cv.Minute + "," + cv.Second + "," + cv.Millisecond);
                    break;


                case "System.Boolean":
                    TempStr = TempStr.Replace(Dt.Columns[j] + j.ToString() + "¾", Dt.Rows[i][j].ToString().ToLower());
                    break;


                default:
                    string str = Dt.Rows[i][j].ToString();
                    str = str.Replace("\n", "\\\\n");
                    str = str.Replace("\\", "\\\\\\\\");
                    str = str.Replace("\"", "ppp");
                    str = str.Replace("'", "\\\'");
                    str = str.Replace("\r", "\\\\r");


                    TempStr = TempStr.Replace(Dt.Columns[j] + j.ToString() + "¾", str);
                    break;
            }
        }


        Sb.Append(TempStr + "},");
    }


    Sb = new StringBuilder(Sb.ToString().Substring(0, Sb.ToString().Length - 1));
    Sb.Append("]}");


    return Sb.ToString();
}

for（int i=0；i

---

我在Ajax调用中添加了error:section，现在得到了error“error；[对象对象]“

最后，我发现了问题所在，我必须在asp.net函数之前添加

”[WebMethod（）]”“

声明。例如

    [WebMethod()]
    public static string GetData()
    {

        try
        {
            string strjson;
            string connectionstring = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
            SqlConnection Con = new SqlConnection(connectionstring);
            DataSet DS = new DataSet();
            String CmdText = "Select Compname,compadd1,compadd2,compemail from aas_company where compid=@cmpid";
            SqlCommand cmd = new SqlCommand(CmdText, Con);
            cmd.Parameters.Add("@cmpid", SqlDbType.Int).Value = 22;
            Con.Open();
            SqlDataAdapter DA = new SqlDataAdapter(cmd);
            DA.Fill(DS);
            DataTable dTable = DS.Tables[0];
            strjson = GetJSONString(dTable);
            Con.Close();               
            return strjson;
        }
        catch (Exception ex)
        {
            throw new System.Exception("Error In Get Data" + ex.Message);
        }
    }

    [WebMethod()]
    public static string GetData()
    {

        try
        {
            string strjson;
            string connectionstring = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
            SqlConnection Con = new SqlConnection(connectionstring);
            DataSet DS = new DataSet();
            String CmdText = "Select Compname,compadd1,compadd2,compemail from aas_company where compid=@cmpid";
            SqlCommand cmd = new SqlCommand(CmdText, Con);
            cmd.Parameters.Add("@cmpid", SqlDbType.Int).Value = 22;
            Con.Open();
            SqlDataAdapter DA = new SqlDataAdapter(cmd);
            DA.Fill(DS);
            DataTable dTable = DS.Tables[0];
            strjson = GetJSONString(dTable);
            Con.Close();               
            return strjson;
        }
        catch (Exception ex)
        {
            throw new System.Exception("Error In Get Data" + ex.Message);
        }
    }