有关post 方式访问 webservice的 一些 底层代码的问题

[honghuixing]

设置ContentType：application/x-www-form-urlencoded";有何用，必须这个值吗？

有必要 UrlEncode("name"); 这个字符串？
既然有Stream writer = req.GetRequestStream(); 那还用response.GetResponseStream(); 作什么？
writer.Write(payload, 0, payload.Length); 写到了哪里了

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string url = "http://localhost/BOOK/CH3/FirstServicecs.asmx/HelloWorld";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
//POST方式请求
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string strname= System.Web.HttpUtility.UrlEncode("name");
strname = strname + "=" + System.Web.HttpUtility.UrlEncode(textBox1.Text);
byte[] payload;//将URL编码后的字符串转化为字节
payload = System.Text.Encoding.UTF8.GetBytes(strname);
req.ContentLength = payload.Length;
Stream writer = req.GetRequestStream();
writer.Write(payload, 0, payload.Length); writer.Close();
HttpWebResponse response = (HttpWebResponse)req.GetResponse();
System.IO.Stream s;
s = response.GetResponseStream();
XmlTextReader reader =new XmlTextReader(s);
reader.MoveToContent();
label1.Text = reader.ReadInnerXml(); reader.Close();

[honghuixing]

？

[honghuixing]

？

[saucer]

>>>置ContentType：application/x-www-form-urlencoded";有何用，必须这个值吗？

it is the standard POST encode type, to do POST, you must use it

>>>有必要 UrlEncode("name"); 这个字符串？

no

>>>>既然有Stream writer = req.GetRequestStream(); 那还用response.GetResponseStream(); 作什么？writer.Write(payload, 0, payload.Length); 写到了哪里了

req.GetRequestStream gets the stream you can write the data into (client side), which will be sent to the remote server

response.GetResponseStream() gets the stream after the remote server returns, so you can read the returned data

suggest you read on HTTP protocol