组织http请求

string stratTime="";
string end=""://要拼接的参数
string    postURL = "http://www.baidu.com?startTime=" + start + "&endTime=" + end;
Encoding dataEncode=Encoding.UTF8;//声明字符格式
byte[] by=dataEncode.GetBytes(postURL);//url转换
HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postURL));
webReq.Method = "post";
webReq.ContentType = "application/json";
webReq.ContentLength = byteArray.Length;
Stream newStream = webReq.GetRequestStream();
newStream.Write(byteArray, 0, byteArray.Length);
HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
string ret = string.Empty;//接受返回的json数据
ret = sr.ReadToEnd();
newStream.Close();
response.Close();

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postURL);
request.ContentType = "application/json";
request.Method = "get";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream instream = response.GetResponseStream();
StreamReader sr = new StreamReader(instream);
ret = sr.ReadToEnd();
sr.Close();
response.Close();
instream.Close();