.net 后台以post方式调用微信公众平台接口

public class Fresult
{
        public int errcode { get; set; }
        public string errmsg { get; set; }
        public string msgid { get; set; }
}

 public static Fresult SendTemplateMessage(string accessToken, string body)
{
            Fresult fresult = new Fresult();
            string uriStr = $"https://api.weixin.qq.com/cgi-bin/message/template/send?access_token={accessToken}";
            var uri = new Uri(uriStr);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
            request.Method = "POST";
            request.ContentType = "application/json";
            request.Accept = "application/json";
            Encoding encoding = Encoding.UTF8;
            byte[] data = encoding.GetBytes(body);
            Stream sm = request.GetRequestStream();
            sm.Write(data, 0, data.Length);
            sm.Close();
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (Stream streamResponse = response.GetResponseStream())
            {
                using (StreamReader streamRead = new StreamReader(streamResponse, Encoding.UTF8))
                {
                    char[] readBuff = new char[256];
                    int count = streamRead.Read(readBuff, 0, 256);
                    string content = "";
                    while (count > 0)
                    {
                        string outputData = new string(readBuff, 0, count);
                        content += outputData;                                             
                        count = streamRead.Read(readBuff, 0, 256);
                    }
                    fresult = JsonConvert.DeserializeObject<Fresult>(content);
                }
            }
            response.Close();
            response.Dispose();
            return fresult;
}