一个扩展方法就可以搞定。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
public static async Task<TResult> TimeoutAfter<TResult>(this Task<TResult> task, TimeSpan timeout)
{
    using (var timeoutCancellationTokenSource = new CancellationTokenSource())
    {
        var completedTask = await Task.WhenAny(task, Task.Delay(timeout, timeoutCancellationTokenSource.Token));
        if (completedTask == task)
        {
            timeoutCancellationTokenSource.Cancel();
            return await task;  // Very important in order to propagate exceptions
        }
        else
        {
            throw new TimeoutException("The operation has timed out.");
        }
    }
}
public static async Task TimeoutAfter(this Task task, TimeSpan timeout)
{
    using (var timeoutCancellationTokenSource = new CancellationTokenSource())
    {
        var completedTask = await Task.WhenAny(task, Task.Delay(timeout, timeoutCancellationTokenSource.Token));
        if (completedTask == task)
        {
            timeoutCancellationTokenSource.Cancel();
            await task;  // Very important in order to propagate exceptions
        }
        else
        {
            throw new TimeoutException("The operation has timed out.");
        }
    }
}

c# - Asynchronously wait for Task to complete with timeout - Stack Overflow