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2019年8月28日，进行代码测试与验证。

2019-8-28测试代码

测试 C# 代码块

// 有返回值 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."); } } } // 无返回值 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."); } } }