C#通过GET/POST方式发送Http请求

///
/// Get请求
/// 
/// 
/// 字符串
public static string GetHttpResponse(string url, int Timeout)
{
      HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
      request.Method = "GET";
      request.ContentType = "text/html;charset=UTF-8";
      request.UserAgent = null;
      request.Timeout = Timeout;

    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    Stream myResponseStream = response.GetResponseStream();
    StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
    string retString = myStreamReader.ReadToEnd();
    myStreamReader.Close();
    myResponseStream.Close();

    return retString;
}

string url="Http://127.0.0.1/login.jsp?Name=zhangshi&Age=30&Submit=%cc%E+%BD%BB";
string res = HttpHelper.GetHttpResponse(url, 6000);
if (res != null)
{
   T mes = JsonHelper.DeserializeJsonToObject<T>(res)
}

        /// 创建POST方式的HTTP请求  
        public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int timeout, string userAgent, CookieCollection cookies)
        {
            HttpWebRequest request = null;
            //如果是发送HTTPS请求  
            if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
            {
                request = WebRequest.Create(url) as HttpWebRequest;
            }
            else
            {
                request = WebRequest.Create(url) as HttpWebRequest;
            }
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";

            //设置代理UserAgent和超时
            //request.UserAgent = userAgent;
            //request.Timeout = timeout; 

            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            //发送POST数据  
            if (!(parameters == null || parameters.Count == 0))
            {
                StringBuilder buffer = new StringBuilder();
                int i = 0;
                foreach (string key in parameters.Keys)
                {
                    if (i > 0)
                    {
                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);
                    }
                    else
                    {
                        buffer.AppendFormat("{0}={1}", key, parameters[key]);
                        i++;
                    }
                }
                byte[] data = Encoding.ASCII.GetBytes(buffer.ToString());
                using (Stream stream = request.GetRequestStream())
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            string[] values = request.Headers.GetValues("Content-Type");
            return request.GetResponse() as HttpWebResponse;
        }


    /// <summary>
    /// 获取请求的数据
    /// </summary>
    public static string GetResponseString(HttpWebResponse webresponse)
    {
        using (Stream s = webresponse.GetResponseStream())
        {
            StreamReader reader = new StreamReader(s, Encoding.UTF8);
            return reader.ReadToEnd();

        }
    }

//参数p
IDictionary<string, string> parameters = new Dictionary<string, string>();
parameters.Add("p", HttpUtility.UrlEncode(p));
//http请求
System.Net.HttpWebResponse res = HttpHelper.CreatePostHttpResponse(url, parameters, 3000, null, null);
if (res == null)
{
    Response.Redirect("RequestFailed.aspx?result=出错了,可能是由于您的网络环境差、不稳定或安全软件禁止访问网络，您可在网络好时或关闭安全软件在重新访问网络。");
}
else
{
    //获取返回数据转为字符串
   string mes = HttpHelper.GetResponseString(res);
   T model = JsonHelper.DeserializeJsonToObject<T>(mes);
}