Webservice返回json数据格式不带xml头部

我将结果内容用字符串拼接成Json数据并返回的时候，会在结果前面添加xml头部，结果如下。

<span ><string xmlns="http://tempuri.org/">  

{"data":[{"batchId":"B001","produceOrderId":"", "produceFactory":"","addTime":"2014/7/8 15:09:00","remark":"","parentId":""},{"batchId":"B002","produceOrderId":"生产订单2", "produceFactory":"测试公司1","addTime":"2014/7/8 8:00:00","remark":"","parentId":"B001"},{"batchId":"B003","produceOrderId":"生产订单3", "produceFactory":"测试公司2","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B001"},{"batchId":"B004","produceOrderId":"生产订单4", "produceFactory":"测试公司3","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B002"},{"batchId":"B005","produceOrderId":"生产订单5", "produceFactory":"测试公司4","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B004"},{"batchId":"B006","produceOrderId":"生产订单6", "produceFactory":"外包公司1","addTime":"2014/7/8 0:00:00","remark":"","parentId":"B005"}]}  

</string></span>  

产生如上数据的Webservice接口代码如下。

<span >  [WebMethod]  

    public String GetQrCodeList(String qrCode)  

    {  

       

        return PriGetQrCodeList(qrCode);  

    }  

  

    /// <summary>  

    /// 获取关联的二维码树结构  

    /// </summary>  

    /// <param name="qrCode">产品二维码</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>  

解决方案：

 

改变数据的返回方式，用 Context.Response.Write代替return 语句，修改GetQrCodeList方法如下即可返回正确的Json格式数据。

 

<span >    [WebMethod]  

    public void GetQrCodeList(String qrCode)  

    {  

        Context.Response.Charset = "GB2312"; //设置字符集类型  

        Context.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");  

        Context.Response.Write(PriGetQrCodeList(qrCode));  

        Context.Response.End();  

    }</span>  

返回结果如下：

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