模拟发送POST或Get请求

UTF8Encoding encoding = new UTF8Encoding();
byte[] data = encoding.GetBytes(requestDataXml.ToString());

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
myRequest.Method = “POST”;
myRequest.ContentType = "application/x-www-form-urlencoded";
myRequest.ContentLength = data.Length;
Stream newStream = myRequest.GetRequestStream();

// 发送数据

newStream.Write(data, 0, data.Length);
newStream.Close();

// 返回数据            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
string content = reader.ReadToEnd();

XElement xe = XElement.Parse(content);
return xe;