简单的HttpClient测试在Mono上失败

Question

在Mac OS X上对Mono(3.2.1)执行这个简单的小测试时,它从不打印任何对控制台的响应,而是说Shutting down finalizer thread timed out.
这个代码有问题还是我的Mono行为不端？

using System;
using System.Net.Http;

namespace VendTest
{
  class MainClass
  {
        public static void Main(string[] args)
        {
            Client client = new Client();
            client.HttpClientCall();
        }
    }

    public class Client
    {
        HttpClient client;

        public Client()
        {
            client = new HttpClient();
        }

        public async void HttpClientCall()
        {
            HttpClient httpClient = new HttpClient();
            HttpResponseMessage response = await httpClient.GetAsync("http://vendhq.com");
            string responseAsString = await response.Content.ReadAsStringAsync();
            Console.WriteLine(responseAsString);
        }
    }
}

Answer 1

你几乎不应该使用async void方法,这就是原因之一.你的Main()意志在HttpClientCall()实际完成之前结束.并且由于退出Main()终止整个应用程序,所以不会打印任何内容.

你应该做的是改变你的方法为async Task,并Wait()为它在你的Main().(混合await并且Wait()通常会导致死锁,但它是控制台应用程序的正确解决方案.)

class MainClass
{
    public static void Main()
    {
        new Client().HttpClientCallAsync().Wait();
    }
}

public class Client
{
    HttpClient client = new HttpClient();

    public async Task HttpClientCallAsync()
    {
        HttpClient httpClient = new HttpClient();
        HttpResponseMessage response = await httpClient.GetAsync("http://vendhq.com");
        string responseAsString = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseAsString);
    }
}