相关疑难解决方法(0)

使用Microsoft for .NET的异步CTP,是否可以捕获调用方法中异步方法抛出的异常？

public async void Foo()
{
    var x = await DoSomethingAsync();

    /* Handle the result, but sometimes an exception might be thrown.
       For example, DoSomethingAsync gets data from the network
       and the data is invalid... a ProtocolException might be thrown. */
}

public void DoFoo()
{
    try
    {
        Foo();
    }
    catch (ProtocolException ex)
    {
          /* The exception will never be caught.
             Instead when in debug mode, VS2010 will warn and continue.
             The deployed the app will simply crash. …

我读到它的任何地方都说下面的代码应该可行,但事实并非如此.

public async Task DoSomething(int x)
{
   try
   {
      // Asynchronous implementation.
      await Task.Run(() => {
      throw new Exception();
      x++;
      });
   }
   catch (Exception ex)
   {
      // Handle exceptions ?
   }
}

也就是说,我没有抓到任何东西,并且在"投掷"线上得到一个"未处理的例外".我在这里很无能为力.

我正在尝试测试以下的http请求方法

public async Task<HttpContent> Get(string url)
    {
        using (HttpClient client = new HttpClient())
// breakpoint
        using (HttpResponseMessage response = await client.GetAsync(url))
// can't reach anything below this point
        using (HttpContent content = response.Content)
        {
            return content;
        }
    }

但是,调试器似乎正在跳过第二条评论下面的代码.我正在使用Visual Studio 2015 RC,有什么想法吗？我也试过检查任务窗口,什么都没看到

编辑:找到解决方案

using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace ConsoleTests
{
    class Program
    {
        static void Main(string[] args)
        {
            Program program = new Program();
            var content = program.Get(@"http://www.google.com");
            Console.WriteLine("Program finished");
        }

        public async Task<HttpContent> Get(string url)
        {
            using (HttpClient …