使用WCF中的数据集返回JSON格式不正确

Question

这是我的目标。

使用WCF Rest服务读取xml数据并返回JSON格式。
*我不想使用JSON.NET *

这是Sample XML数据。

<students>
<student>
    <student_id>1111</student_id>
    <student_name>
        <student_title>Mr</student_title>
        <student_first_name>Shi</student_first_name>
        <student_last_name>Oki</student_last_name>
        <level>2</level>
    </student_name>
    <student_address>
        <student_address_line_one>JP</student_address_line_one>
        <student_address_line_two>Japan</student_address_line_two>
        <student_address_line_three>Tokyo, Japan</student_address_line_three>
        <student_address_line_four>1234</student_address_line_four>
        <student_address_line_five>Japan</student_address_line_five>
        <zip_code>1234</zip_code>
    </student_address>      
    <gender>Male</gender>
    <phone_no>12345678</phone_no>
</student>

这是服务功能。

public string GetXmlDataToJsonUsingDataSet(string id)
    {
        string jsonClient = "";
        string szXmlFile = "C:\\test.xml";


        //load xmlFile
        XmlDocument doc = new XmlDocument();
        doc.Load(szXmlFile);

        DataSet ds = new DataSet();
        //ds.ReadXml(szXmlFile);

        using (XmlReader xReader = new XmlNodeReader(doc.DocumentElement))
        {
            ds.ReadXml(xReader);
            xReader.Close();
        }

        Dictionary<string, object> dict = new Dictionary<string, object>();
        foreach (DataTable dt in ds.Tables)
        {
            object[] arr = new object[dt.Rows.Count];
            object[] arrColumn;
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                arrColumn = new object[dt.Columns.Count];
                int j = 0;
                foreach (DataColumn column in dt.Columns)
                {
                    arrColumn[j] = column.ColumnName + " : " + dt.Rows[i][column];
                    j++;
                }
                arr[i] = arrColumn;
            }
            dict.Add(dt.TableName, arr);
        }

        JavaScriptSerializer jss = new JavaScriptSerializer();
        jsonClient = jss.Serialize(dict);

        return jsonClient;
    }  

这是[OperationContract]。

[OperationContract]
    [WebInvoke(Method = "GET",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Wrapped,
        UriTemplate = "tjson/{id}")]
    string GetXmlDataToJsonUsingDataSet(string id);  

这是JSON结果。

{
"student":
[
    [
        "student_id : 1111",
        "student_Id_0 : 0",
        "gender : Male",
        "phone_no : 12345678"
    ]
],
"student_name":
[
    [
        "student_title : Mr",
        "student_first_name : Shi",
        "student_last_name : Oki",
        "level : 2",
        "student_Id_0 : 0"
    ]
],
"student_address":
[
    [
        "student_address_line_one : JP",
        "student_address_line_two : Japan",
        "student_address_line_three : Tokyo, Japan",
        "student_address_line_four : 1234",
        "student_address_line_five : Japan",
        "zip_code : 1234",
        "student_Id_0 : 0"
    ]
]

}

这是我的专家JSON结果。

 {
"student":
{
    "student_id" : "1111",
    "gender" : "Male",
    "phone_no" : "12345678",    
    "student_name":
    [
        {
            "student_title" : "Mr",
            "student_first_name" : "Shi",
            "student_last_name" : "Oki"             
        }
    ],
    "student_address":
    [
        {
            "student_address_line_one" : "JP",
            "student_address_line_two" : "Japan",
            "student_address_line_three" : "Tokyo, Japan",
            "student_address_line_four" : "1234",
            "student_address_line_five" : "Japan",
            "zip_code" : "1234"             
        }
    ]
}

}

请帮忙！谢谢。