How Can I Implement a Generic Timeout for a Single Line of Code in C#?

Implementing a universal code timeout mechanism in C#

Question:

How to create a generic method in C# that executes a single line of code within a given timeout? This is useful for working with code that cannot be modified and may cause problems, and to terminate code execution on a timeout.

Answer:

Implementing a generic timeout handler requires careful consideration, especially in terms of stopping problematic code after a timeout. The following solution combines lambda expressions and threading.

The

key method is CallWithTimeout which accepts the code to execute (a Action delegate) and the desired timeout in milliseconds.

Implementation:

    static void CallWithTimeout(Action action, int timeoutMilliseconds)
    {
        Thread threadToKill = null;
        Action wrappedAction = () =>
        {
            threadToKill = Thread.CurrentThread;
            try
            {
                action();
            }
            catch (ThreadAbortException ex)
            {
                Thread.ResetAbort(); // 取消强制中止以实现优雅退出。
            }
        };

        IAsyncResult result = wrappedAction.BeginInvoke(null, null);
        if (result.AsyncWaitHandle.WaitOne(timeoutMilliseconds))
        {
            wrappedAction.EndInvoke(result);
        }
        else
        {
            threadToKill.Abort();
            throw new TimeoutException();
        }
    }

Usage:

The

CallWithTimeout method can be used as follows:

    static void Main(string[] args)
    {
        // 调用一个执行时间为5秒的方法，设置6秒的超时时间
        CallWithTimeout(FiveSecondMethod, 6000);

        // 调用同一个方法，设置4秒的超时时间，这将触发超时异常
        CallWithTimeout(FiveSecondMethod, 4000);
    }

    static void FiveSecondMethod()
    {
        Thread.Sleep(5000);
    }

In this example, FiveSecondMethod will run successfully within the 6 second timeout, but will throw a TimeoutException exception within the 4 second timeout.

Note:

The above code cancels the timeout thread by aborting the thread, which may not be ideal in some cases. If a more elegant cancellation method is required, other mechanisms can be implemented.

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