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。

1.   
2. {"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"}]}  
3.   

产生如上数据的Webservice接口代码如下。

1.   [WebMethod]  
2.     public String GetQrCodeList(String qrCode)  
3.     {  
4.        
5.         return PriGetQrCodeList(qrCode);  
6.     }  
7.   
8.     /// 
     
9.     /// 获取关联的二维码树结构  
10.     ///   
11.     /// 产品二维码  
12.     ///   
13.     private String PriGetQrCodeList(String qrCode)  
14.     {  
15.         try  
16.         {  
17.             String sfull = "{{\"data\":[{0}]}}";  
18.             String spart = "{{\"batchId\":\"{0}\",\"produceOrderId\":\"{1}\", \"produceFactory\":\"{2}\",\"addTime\":\"{3}\",\"remark\":\"{4}\",\"parentId\":\"{5}\"}}";  
19.             String sData = "";  
20.             DataTable dt = bll.GetQrCodeList(qrCode);  
21.             if (dt == null || dt.Rows.Count == 0) return "";  
22.             for (int i = 0; i < dt.Rows.Count; i++)  
23.             {  
24.                 sData += (String.Format(spart,  
25.                     dt.Rows[i]["BatchId"].ToString(),  
26.                     dt.Rows[i]["ProduceOrderId"].ToString(),  
27.                     dt.Rows[i]["ProduceFactory"].ToString(),  
28.                     dt.Rows[i]["AddTime"].ToString(),  
29.                     dt.Rows[i]["Remark"].ToString(),  
30.                     dt.Rows[i]["ParentId"].ToString()) + ",");  
31.             }  
32.             return String.Format(sfull, sData.TrimEnd(','));  
33.         }  
34.         catch (Exception)  
35.         {  
36.             return "";  
37.         }  
38.     }  

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。

 

1.     [WebMethod]  
2.     public void GetQrCodeList(String qrCode)  
3.     {  
4.         Context.Response.Charset = "GB2312"; //设置字符集类型  
5.         Context.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");  
6.         Context.Response.Write(PriGetQrCodeList(qrCode));  
7.         Context.Response.End();  
8.     }  

返回结果如下：

1. {"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"}]}