C# HTTP RAW 传输

public static string HttpPostRaw(string url, string data)
        {
            string value = "";
            try
            {
                HttpWebRequest reqest = (HttpWebRequest)(url);
                = "POST";
                = "application/json";
                Stream stream = ();
                byte[] bs = .(data);
                (bs, 0, );
                ();
                ();
                HttpWebResponse response = (HttpWebResponse)();
                StreamReader sr = new StreamReader((), Encoding.UTF8);
                value = ();
                ();
                return value;
            }
            catch (Exception ex)
            {
                error = ();
                return "";
            }
        }