WebApi Core项目调试挂起等待client.GetAsync

Question

我有2个项目的解决方案:Asp.Net WebApi Core和WinForms.我将使用WinForm的服务.

更改了解决方案属性以启动多个项目:第一个WebApi然后是WinForm(主窗体是FORM1).

现在,我有如下的简单代码:

private void button1_Click(object sender, EventArgs e)
{
    TestAutentication().Wait();
    Console.ReadKey();
}

static async Task TestAutentication()
{
    HttpClientHandler handler = new HttpClientHandler();
    handler.UseDefaultCredentials = true;
    using (var client = new HttpClient(handler))
    {

        client.BaseAddress = new Uri("http://localhost:53791");

        try
        {
            HttpResponseMessage response = await client.GetAsync("api/ValuesController");
            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsAsync<string>();
                Console.WriteLine("{0}", result);
            }
            else
            {
                Console.WriteLine("{0}", response.ReasonPhrase);
            }

        }
        catch (HttpRequestException ex)
        {
            Console.WriteLine("{0}", ex.Message);
        }

    }
}

在启动浏览器期间打开然后打开FORM1.在执行该行时单击button1调试器:

HttpResponseMessage response = await client.GetAsync("api/ValuesController");

悬挂的原因是什么？

提前致谢.

Answer 1

您通过调用.Wait()任务使主线程死锁.你需要在堆栈中一直等待任务,如下所示:

private async void button1_Click(object sender, EventArgs e)
{
    await TestAutentication();
    Console.ReadKey();
}

关于async void注释,它们通常是代码气味,应该避免,但是当用于事件处理程序时,它是可以的.

参考: 我应该避免'async void'事件处理程序吗？