无法通过HttpClient PostAsync发布数据

Question

我正在使用HttpClient使用post通过C＃控制台应用程序将数据发送到服务器。 HttpClient PostAsync无法通过字典对象发布我尝试以各种格式发送的数据，即字符串内容，二进制内容，流内容，http内容，但是该内容为null，服务器返回请求无效异常，这是我的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Windows;
using System.Windows.Input;
using System.IO;
using System.Web;


namespace ConsoleApplication1
{
    class Program
    {
        string str = ""; int j = 0;
        static void Main(string[] args)
        {
            Program df = new Program();

            df.Started();

        }


         public async void Started()
         {
             string contentLength="0";
             try
             {
                 contentLength = await AccessTheWebAsync();
             }
             catch (Exception e)
             {

             }


             Console.WriteLine(contentLength);
         }

        async Task<string> AccessTheWebAsync()
        {  
            HttpClient client = new HttpClient();

            string token =  "qwerty1234";
            string test = "1";
            string postrequest = "<?xml version='1.0' encoding='UTF-8'?>" +
                              "<request> " +
                              "<rec>asdf1234</rec> " +
                              " <lid>9876</lid> " +
                              "</request> ";


            Dictionary<string, string> dict = new Dictionary<string, string>();
            dict.Add("token", token);
            dict.Add("test", test);
            dict.Add("request", postrequest);

            HttpContent content = new FormUrlEncodedContent(dict);

            Uri url = new Uri("http://example.com/"); 

            Task<HttpResponseMessage> getStringTask = client.PostAsync(url, content);    

            HttpResponseMessage httpmesssage = await getStringTask;
            Stream respons = await httpmesssage.Content.ReadAsStreamAsync();
            StreamReader sr = new StreamReader(respons);
            string response =  sr.ReadToEnd();
            return response;

        }



        }

}

提前致谢

Answer 1

在Console应用程序中，您需要使用Task.Wait ， Console.ReadKey或类似方法等待操作完成。 另外，避免async void ：

static void Main(string[] args)
{
    Program df = new Program();
    df.StartedAsync().Wait();
}

public async Task StartedAsync()