一个扩展方法就可以搞定。

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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