摘要：
当我用字符串将结果内容连接到Json数据中并返回它时，我将在结果前面添加一个xml头<//Tempuri。org/“>；/span>；生成上述数据的Web服务界面代码如下所示。///获取相关的QR码树结构///<；param name=“qrCode”>；产品QR码<；<；
问题：
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。
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- <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。
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- <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。
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- <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：
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- <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>