ping异步问题

Question

我必须在下面指示的行上有一个断点才能工作。否则，该程序只是无限期地暂停。

    async Task<List<PingReply>> PingAsync()
    {
        var pingTargetHosts = GetIPs();
        var pingTasks = pingTargetHosts.Select(host => new Ping().SendPingAsync(host, 2000)).ToList();
        var pingResults = await Task.WhenAll(pingTasks); //THIS LINE NEEDS A BREAKPOINT TO WORK
        return pingResults.ToList();
    }

代码被称为

        List<PingReply> GetReplies()
    {
        var PingIPs = PingAsync();
        MessageBox.Show("Loading:...");
        List<PingReply> Results = PingIPs.Result;
        return Results;
    }

任何人都可以告诉我如何修改我的代码以删除断点，但仍然具有功能性的代码。

编辑：未经测试，但是99％的人肯定会起作用。

async Task<List<PingReply>> PingAsync()
    {
        var pingTargetHosts = GetIPs();
        var pingTasks = pingTargetHosts.Select(async host => await new Ping().SendPingAsync(host, 2000)).ToList();
        var pingResults = await Task.WhenAll(pingTasks);
        return pingResults.ToList();
    }
    async Task<List<PingReply>> GetReplies()
    {
        var PingIPs = PingAsync();
        MessageBox.Show("Loading:...");
        return await PingIPs;
    }
    async Task BuildDictionary()
    {
        List<PingReply> Replies = await GetReplies();
        //Use this list via foreach
    }
    async private void button1_Click(object sender, EventArgs e)
    {
        EthernetCheck checker = new EthernetCheck();
        checker.Check();
        bool IsEthernetIn = checker.PluggedIn;
        if (IsEthernetIn)
        {
            await BuildDictionary();
            //Do Stuff
        }           
    }

Answer 1

您的代码正在陷入僵局，因为您正在封锁异步代码。要修复它，请一直使用async：

async Task<List<PingReply>> GetRepliesAsync()
{
  var PingIPs = PingAsync();
  MessageBox.Show("Loading:...");
  return await PingIPs;
}

用法：

var replies = await GetRepliesAsync();

Answer 2

当使用async/等待时，您应该记住，.NET框架将控制程序执行的流动，因此，我建议您将所有调用异步用于避免这种问题。

async Task<List<PingReply>> PingAsync()
{
    var pingTargetHosts = await GetIPs();
    var pingTasks = pingTargetHosts.Select(host => await new Ping().SendPingAsync(host, 2000)).ToList();
    var pingResults = await Task.WhenAll(pingTasks);
    return pingResults.ToList();
}