C# post 请求数据

url 请求的路径地址 postData 传入的参数

   public static string Post(string url, string postData)
        {
            CookieContainer cookieContainer = new CookieContainer();
            Uri URI = new Uri(url);
            byte[] byteArr = Encoding.UTF8.GetBytes(postData);
            HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.CookieContainer = cookieContainer;
            request.ContentLength = byteArr.Length;
            Stream st = request.GetRequestStream();
            st.Write(byteArr, 0, byteArr.Length);
            st.Close();
            WebResponse response = request.GetResponse() as WebResponse;
            System.IO.Stream responseStream = response.GetResponseStream();
            System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
            string srcString = reader.ReadLine();
            responseStream.Dispose();
            reader.Dispose();
            return srcString;
        }