Webservice返回json數據格式

問題：

我將結果內容用字符串拼接成Json數據並返回的時候，會在結果前面添加xml頭部，結果以下。

 

<span ><string xmlns="http://tempuri.org/">
{"data":[{"batchId":"B001","produceOrderId":"", "produceFactory":"","addTime":"2014/7/8 15:09:00","remark":"","parentId":""},{"batchId":"B002","produceOrderId":"生產訂單2", "produceFactory":"測試公司1","addTime":"2014/7/8 8:00:00","remark":"","parentId":"B001"},{"batchId":"B003","produceOrderId":"生產訂單3", "produceFactory":"測試公司2","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B001"},{"batchId":"B004","produceOrderId":"生產訂單4", "produceFactory":"測試公司3","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B002"},{"batchId":"B005","produceOrderId":"生產訂單5", "produceFactory":"測試公司4","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B004"},{"batchId":"B006","produceOrderId":"生產訂單6", "produceFactory":"外包公司1","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B005"}]}
</string></span>

產生如上數據的Webservice接口代碼以下。

 

 

<span >  [WebMethod]
    public String GetQrCodeList(String qrCode)
    {

        return PriGetQrCodeList(qrCode);
    }

    /// <summary>
    /// 獲取關聯的二維碼樹結構
    /// </summary>
    /// <param name="qrCode">產品二維碼</param>
    /// <returns></returns>
    private String PriGetQrCodeList(String qrCode)
    {
        try
        {
            String sfull = "{{\"data\":[{0}]}}";
            String spart = "{{\"batchId\":\"{0}\",\"produceOrderId\":\"{1}\", \"produceFactory\":\"{2}\",\"addTime\":\"{3}\",\"remark\":\"{4}\",\"parentId\":\"{5}\"}}";
            String sData = "";
            DataTable dt = bll.GetQrCodeList(qrCode);
            if (dt == null || dt.Rows.Count == 0) return "";
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                sData += (String.Format(spart,
                    dt.Rows[i]["BatchId"].ToString(),
                    dt.Rows[i]["ProduceOrderId"].ToString(),
                    dt.Rows[i]["ProduceFactory"].ToString(),
                    dt.Rows[i]["AddTime"].ToString(),
                    dt.Rows[i]["Remark"].ToString(),
                    dt.Rows[i]["ParentId"].ToString()) + ",");
            }
            return String.Format(sfull, sData.TrimEnd(','));
        }
        catch (Exception)
        {
            return "";
        }
    }</span>

解決方案：

 

改變數據的返回方式，用 Context.Response.Write代替return 語句，修改GetQrCodeList方法以下便可返回正確的Json格式數據。

 

<span >    [WebMethod]
    public void GetQrCodeList(String qrCode)
    {
        Context.Response.Charset = "GB2312"; //設置字符集類型
        Context.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Context.Response.Write(PriGetQrCodeList(qrCode));
        Context.Response.End();
    }</span>

返回結果以下：

 

 

<span >{"data":[{"batchId":"B001","produceOrderId":"", "produceFactory":"","addTime":"2014/7/8 15:09:00","remark":"","parentId":""},{"batchId":"B002","produceOrderId":"生產訂單2", "produceFactory":"測試公司1","addTime":"2014/7/8 8:00:00","remark":"","parentId":"B001"},{"batchId":"B003","produceOrderId":"生產訂單3", "produceFactory":"測試公司2","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B001"},{"batchId":"B004","produceOrderId":"生產訂單4", "produceFactory":"測試公司3","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B002"},{"batchId":"B005","produceOrderId":"生產訂單5", "produceFactory":"測試公司4","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B004"},{"batchId":"B006","produceOrderId":"生產訂單6", "produceFactory":"外包公司1","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B005"}]}</span>