Message: XML 文档只能有一个顶层元素。....

Question

这是代码
public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string uid = context.Request.QueryString["uid"];//用户编号
            string ret = "";
            if (uid != null && uid != "")
            {
                DataTable dt = AskDA.GetPhoneAskLog(uid);
                if (dt.Rows.Count > 0)
                {
                    foreach (DataRow row in dt.Rows)
                    {
                        string subject = row["subject"].ToString();
                        string nums = row["num"].ToString();
                        ret = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><root><p subject=\"" + subject + "\" num=\"" + nums + "\"/></root>";                        context.Response.ContentEncoding = System.Text.Encoding.UTF8;
                        context.Response.Write(ret);
                    }
                }
            }
        }
调用的方法啥的都没错  就是老提示文档只能有一个顶层元素。....  怎么回事啊 编码也看了 搞不清

Answer 1

ret 这个是不是应该写到循环外呢，你这样不是循环添加多个root吗

Answer 2

不好意思 发错了 是这个文件
string ret = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><root>";
            if (uid != null && uid != "")
            {
                if (subj != null && subj != "")
                {
                    DataTable dt = AskDA.GetIMAskLogDetail(uid,subj);
                    if (dt.Rows.Count > 0)
                    {
                        foreach (DataRow row in dt.Rows)
                        {
                            string seqid = row["seq_id"].ToString();
                            string gid = row["gid"].ToString();
                            string sname = row["send_user_name"].ToString();
                            string rname = row["recv_user_name"].ToString();
                            string txt = row["txt"].ToString();
                            string subject = row["subject"].ToString();
                            string showflag = row["show_flag"].ToString();
                            string sid = row["send_user_id"].ToString();
                            string rid = row["recv_user_id"].ToString();
                            string cdate = row["create_date"].ToString();                            ret += "<p seq_id=\"" + seqid + "\" gid=\"" + gid + "\" send_user_name =\"" + sname + "\"" +
                                       " recv_user_name =\"" + rname + "\" txt=\"" + txt + "\" subject=\"" + subject + "\" show_flag =\"" + showflag + "\" " +
                                       "send_user_id =\"" + sid + "\" recv_user_id=\"" + rid + "\" create_date=\"" + cdate + "\"/>";
                            ret += "</root>";
                            context.Response.ContentEncoding = System.Text.Encoding.UTF8;
                            context.Response.Write(ret);
                        }
                        
                    }
                }

Answer 3

他老是提示：Message: XML 文档只能有一个顶层元素  错误

Answer 4

context.Response.Clear();
context.Response.ContentType = "text/xml";
string ret = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><root>";
,...
context.Response.ContentEncoding = System.Text.Encoding.UTF8;
context.Response.Write(ret);
context.Response.End();

Answer 5

我说把ret 到写入文件之前的值打出来看看。

Answer 6

本帖最后由 net_lover 于 2012-03-28 15:55:43 编辑

  

Answer 7

这就是提示 Message: XML 文档只能有一个顶层元素。Line: 1
Char: 118
Code: 0
URI: http://localhost:6310/UCenter/NewTools/PhoneLog.ashx?uid=133不能传图 只能复制下来错误提示了

Answer 8

但是把context.Response.Write(ret);和ret += "</root>";结束标记放里面是因为多条数据循环输出  放里面放外面都不行

Answer 9

这就是提示  Message: XML 文档只能有一个顶层元素。Line: 1
Char: 118
Code: 0
URI: http://localhost:6310/UCenter/NewTools/PhoneLog.ashx?uid=133不能传图 只能复制下来错误提示了

Answer 10

context.Response.Clear();
context.Response.ContentType = "text/xml";
string ret = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><root>";
,...
context.Response.ContentEncoding = System.Text.Encoding.UTF8;
context.Response.Write(ret);
context.Response.End();