C#在autopilot上不使用异步方法将httpclient post转换为restsharp post

我试图将这段代码从异步任务[Http客户端post]转换为rest sharp post方法。以下是使用httpclient的异步任务方法的工作示例:

 static async Task addEmailToListAsync(string ListName, string Email, string FirstName, string LastName)
    {
        try
        {
            var baseAddress = new Uri("https://api2.autopilothq.com/");

            using (var httpClient = new HttpClient { BaseAddress = baseAddress })
            {

                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("autopilotapikey", "mykey");

                using (var content = new StringContent(""))
                {
                    using (var response = await httpClient.PostAsync("v1/list/" + ListName + "/contact/" + Email, content))
                    {
                        string responseData = await response.Content.ReadAsStringAsync();
                    }
                }
            }
        }
        catch (Exception)
        {

            await addEmailToListAsync(ListName, Email, FirstName, LastName);
        }


    }

这个方法有效,自动驾驶仪以“{}”的形式返回一个响应,这表示一切都进行得很顺利。

现在,我尝试使用restsharp库转换此函数,并实现它,以便该方法不是异步任务,而是一个简单的void函数:

 public static void addEmailToList(string ListName, string Email, string FirstName, string LastName)
        {

            var client = new RestClient("https://api2.autopilothq.com/");

            
            client.AddDefaultHeader("autopilotapikey", "mykey");

            var request = new RestRequest("v1/list",Method.POST);

            var jsonObj = JsonSerializer.Serialize(new 
            { 
                ListName = ListName,
                Contact = Email
            });

            request.AddParameter("application/json", jsonObj, ParameterType.RequestBody);

            var res = client.Execute(request).Content;

            var test = "";
        }

这是我在转换时尝试过的示例-但我不断从restsharp获得消息,身体数据无效。。。

我做错了什么?我在胡思乱想,但我想不出来。。