通过控制台程序的C#webapi POST

我有一个可以通过浏览器成功访问的web api：-

https://127.0.0.1:8443/ncrApi

我正在尝试使用VS2015在C#中创建一个简单的控制台程序，以便使用httpPOST发送数据和接收响应。

以下是我目前所拥有的：-

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
namespace WebSample
{
    class ApiSendData
    {
        public string UserID { get; set;}  // username 
        public string Password { get; set;}  // password for the webapi
        public string ApiFunction { get; set; }
        public string DppName { get; set; }
        public string ClearData { get; set; }
        public string DppVersion { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // The Main function calls an async method named RunAsync 
            // and then blocks until RunAsyncc completes.
            RunAsync().Wait();
        }
        static async Task RunAsync()
        {
            using (var client = new HttpClient())
            {
                //specify to use TLS 1.2 as default connection
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
                // This code sets the base URI for HTTP requests, 
                // and sets the Accept header to "application/json", 
                // which tells the server to send data in JSON format.
                client.BaseAddress = new Uri("https://localhost:8443/");
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                // HTTP POST
                var datatobeSent = new ApiSendData()
                                    {
                                        UserID = "xxxx",
                                        Password = "yyyy",
                                        ApiFunction ="NcrSecureData",
                                        DppName ="CSampleCustomer",
                                        DppVersion ="Latest",
                                        ClearData ="1234567890",
                                        ResultType = "JSON"
                                    };
                HttpResponseMessage response = await client.PostAsJsonAsync("ncrApi", datatobeSent);
                if (response.IsSuccessStatusCode)
                {
                    // Get the URI of the created resource.
                    Uri ncrUrl = response.Headers.Location;
                    // do whatever you need to do here with the returned data //

                }
            }
        }
    }
}

在我的响应变量中，我得到了200 OK http 1.1消息，内容类型=application/json，内容长度=174……但没有收到实际数据。。。

变量ncrUrl也是null。。。。

我想知道我的控制台程序中是否需要额外的语句来接收数据？

以下是我一直关注的内容：-http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client

HttpResponseMessage response = await client.PostAsJsonAsync("ncrApi", datatobeSent);
using (Stream output = File.OpenWrite("filename.txt")) // change
{
    using (Stream input = await response.Content.ReadAsStreamAsync())
    {
        input.CopyTo(output);
    }
}