.NET处理请求后返回XML，为什么返回的XML带有处理页的HTML代码，如何避免

.NET处理请求后返回XML，为什么返回的XML带有处理页的HTML代码，如何处理？
为做数据接口，发送XML请求至一个处理页面 ReOnly.aspx
ReOnly.aspx 前台页面为默认创建的内容
cs代码如下：

C# code


public partial class ReOnly : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //设置 HTTP 头
            //Response.ContentType = "text/xml";
            //Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            Response.Clear();
            XmlTextWriter writer = null;
            writer = new XmlTextWriter(Response.Output);
            writer.Formatting = Formatting.Indented;
            writer.WriteStartDocument();
                writer.WriteStartElement("root");
                    writer.WriteStartElement("appid");
                    writer.WriteString("aaa");
                    writer.WriteEndElement();

                    writer.WriteStartElement("status");
                    writer.WriteString("0");
                    writer.WriteEndElement();

                    writer.WriteStartElement("needcookie");
                    writer.WriteString("2");
                    writer.WriteEndElement();

                writer.WriteEndElement();
            writer.WriteEndDocument();
        }
    }

请求的主要内容如下：

C# code


WebRequest request = WebRequest.Create(url);
                request.Method = "POST";
                string sendData = xmlDoc.InnerXml;
                byte[] byteArray = Encoding.Default.GetBytes(sendData);

                Stream dataStream = request.GetRequestStream();
                dataStream.Write(byteArray, 0, byteArray.Length);
                dataStream.Close();

                WebResponse response = request.GetResponse();
                dataStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(dataStream, System.Text.Encoding.GetEncoding("GB2312"));
                string responseXml = reader.ReadToEnd();

                //try
                //{
                    xml.LoadXml(responseXml);//这里提示了错误，说DTD内容应该在写根节点前，原因主要是返回了多余的html代码
                    string status = xml.DocumentElement.SelectSingleNode("status").InnerText;
                    if (status == "0")
                    {
                        Message = "返回成功！";
                    }
                    else
                    {
                        Message = "请求数据错误！";
                    }

xml.LoadXml 得到的代码

XML code


<?xml version="1.0" encoding="utf-8"?>
<root>
  <appid>aaa</appid>
  <status>0</status>
  <needcookie>2</needcookie>
</root>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>

</title></head>
<body>
    <form name="form1" method="post" action="ReOnly.aspx" id="form1">
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTE2MTY2ODcyMjlkZLqex1hYqVDdvl7couz8D8g1tCTz" />

    <div>
    
    </div>
    </form>
</body>
</html>

我看把多余的 ReOnly.aspx 的 html 代码也给返回回来了，请问在返回XML 的时候要如何避免返回HTML 代码的内容呢？

谢谢！

------解决方案--------------------

.NET处理请求后返回XML，为什么返回的XML带有处理页的HTML代码，如何避免

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