C# 控制台应用程序 - 我如何始终从控制台读取输入？

Question

我目前正在编写一个使用大量多线程的控制台应用程序。我希望能够始终允许用户在控制台中输入内容但是，线程会定期向控制台输出，但我希望用户始终能够将内容输入控制台并让我处理输入.

我将如何实现这一目标？我在网上没有找到任何相关信息？

提前致谢！

这是c#顺便说一句！

Answer 1

编辑。我几年前的原始答案依赖于用户输入一个魔术字符串来结束控制台侦听器，而忽略了 CTL+C 已经是默认的取消信号。

class Program
{
    readonly static CancellationTokenSource _cancelTokenSrc = new CancellationTokenSource();

    static void Main(string[] args)
    {
        // CTL + C is the built-in cancellation for console apps; 
        Console.CancelKeyPress += Console_CancelKeyPress;
        CancellationToken cancelToken = _cancelTokenSrc.Token;

        Console.WriteLine("Type commands followed by 'ENTER'");
        Console.WriteLine("Press CTL+C to Terminate");
        Console.WriteLine();
        try
        {
            // thread that performs background work until cancelled
            Task.Run(() => DoWork(), cancelToken);
            // thread that listens for keyboard input until cancelled
            Task.Run(() => ListenForInput(), cancelToken);
            // continue listening until cancel signal is sent
            cancelToken.WaitHandle.WaitOne();
            cancelToken.ThrowIfCancellationRequested();
        }
        catch (OperationCanceledException)
        {
            Console.WriteLine("Operation Canceled.");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }

    static void ListenForInput()
    {
        while (true)
        {
            string userInput = Console.ReadLine();
            if(!String.IsNullOrWhiteSpace(userInput))
                Console.WriteLine($"Executing user command {userInput}...");
        }
    }

    static void DoWork()
    {
        while (true)
        {
            Thread.Sleep(3000);
            Console.WriteLine("Doing work...");
        }
    }

    static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
    {
        // we want to cancel the default behavior so we can send the cancellation signal
        // to our background threads and not just terminate here
        e.Cancel = true;
        Console.WriteLine("Cancelling...");
        _cancelTokenSrc.Cancel();
    }
}