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asp.net core 向外部服务器Post数据并获取返回

/// <summary>
/// Post提交
/// </summary>
/// <param name="url">链接</param>
/// <param name="param">参数</param>
/// <returns></returns>
public static string Post(string url,string param)
{
    string result = "";
    try
    {
          string strURL = url;
          System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);      
          request.Method = "POST";
          request.ContentType = "application/json;charset=UTF-8";
          string paraUrlCoded = param;
          byte[] payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
          request.ContentLength = payload.Length;
          Stream writer = request.GetRequestStream();
          writer.Write(payload, 0, payload.Length);
          writer.Close();
          System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
          System.IO.Stream s = response.GetResponseStream();//返回数据流 

          //获取服务端返回数据
          StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
          result = sr.ReadToEnd().Trim();
 
    }
    catch (Exception e)
    {
            Logger.Error(e.ToString());
    }
    return result;
}