http Get 发送body数据

public static string HttpGet(string Url, string header = "", string senddata = "")
        {
            //byte[] dataArray = System.Text.Encoding.UTF8.GetBytes(senddata);
            // Console.Write(Encoding.UTF8.GetString(dataArray));

            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(Url);
            request.Method = "get";
            request.ContentType = "application/json";
            if (!string.IsNullOrEmpty(header))
            {
                request.Headers.Add("Authorization", header);
            }
            
            //request.ContentLength = dataArray.Length;
            //request.CookieContainer = cookie;
            if (!string.IsNullOrEmpty(senddata))
            {
                var type = request.GetType();
                var currentMethod = type.GetProperty("CurrentMethod", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(request,null);
                var methodType = currentMethod.GetType();
                methodType.GetField("ContentBodyNotAllowed", BindingFlags.NonPublic | BindingFlags.Instance).SetValue(currentMethod, false);

                using (var streamWriter = new StreamWriter(request.GetRequestStream()))
                {
                    streamWriter.Write(senddata);
                }
            }
            
            try
            {
                System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
                System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
                String res = reader.ReadToEnd();
                reader.Close();
                return res.ToString();
            }
            catch (Exception e)
            {
                return e.Message + e.ToString();
            }
        }