Question

我正在创建一个将执行无限过程的C＃控制台应用程序。当用户按下转义键时，如何让应用程序“暂停”？

一旦用户按下转义键，我希望该选项退出应用程序或从中断处继续循环。我不希望在这个过程中出现任何不连续性。如果我在步骤100按Esc，我应该可以在步骤101重新选择。

到目前为止，这是我的方法：

    // Runs the infinite loop application 
    public static void runLoop()
    {
        int count = 0;
        while (Console.ReadKey().Key!= ConsoleKey.Escape)
        {
                WriteToConsole("Doing stuff.... Loop#" + count.ToString());
                for (int step = 0; step <= int.MaxValue; step++ ) {
                    WriteToConsole("Performing step #" + step.ToString());
                    if (step == int.MaxValue)
                    {
                        step = 0; // Re-set the loop counter
                    }
                }


                count++;
        }

        WriteToConsole("Do you want to exit?  y/n");
        exitApplication(ReadFromConsole());
    }

有没有办法在单独的线程中检查用户输入密钥，然后在另一个线程看到Esc按键时暂停无限循环？

Answer 1

要确定循环中是否有可用的密钥，您可以执行以下操作：

while (someLoopCondition)
{
    //Do lots of work here
    if (Console.KeyAvailable)
    {
        var consoleKey = Console.ReadKey(true);  //true keeps the key from
                                                 //being displayed in the console
        if (consoleKey.Key == ConsoleKey.Escape)
        {
            //Pause here, ask a question, whatever.
        }
    }
}

如果输入流中的某个键准备好读取并且它是非阻塞调用，则

Console.KeyAvailable返回true，因此它不会暂停以等待输入。您可以检查是否按下了退出键，如果条件为真，则可以暂停或执行任何操作。

Answer 2

罗恩，非常感谢你的回答。使用

    public static void runUpdater()
    {
        int count = 0;
        while (true)
        {
                WriteToConsole("Doing stuff.... Loop# " + count.ToString());
                for (int step = 0; step <= int.MaxValue; step++)
                {
                    if (!breakCurrentOperation())
                    {
                        WriteToConsole("Performing step #" + step.ToString());
                        if (step == int.MaxValue)
                        {
                            step = 0; // Re-set the loop counter
                        }
                    }
                    else
                    {
                        break;
                    }
                }
                count++;


                if (!startNewOperation())
                {
                    // Noop
                }
                else
                {
                    break;
                }

        }

        WriteToConsole("\nAre you ready to run the   database updater again? y/n");
        startApplication(ReadFromConsole());
    }

    public static bool startNewOperation()
    {
        WriteToConsole("Do you want go back to the main menu or start a new update process?  \nType y to start a new update process or n to go to the main menu.");
        string input = ReadFromConsole();

        if (input == "y" || input == "Y")
        {
            return false;
        }
        else if (input == "n" || input == "N")
        {
            return true; // Noop - Restart the Loop from the begining
        }
        else
        {
            WriteToConsole("Error: Input was not recognized. ");
            return startNewOperation(); // Recursivly call method untill user enters a logical input
        }
    }

    public static bool breakCurrentOperation()
    {
        if (Console.KeyAvailable)
        {
            var consoleKey = Console.ReadKey(true);
            if (consoleKey.Key == ConsoleKey.Escape)
            {
                WriteToConsole("Do you want to stop the current process? \nType s to stop or c to continue.");
                string input = Console.ReadLine();
                if (input == "c" || input == "C")
                {
                    return false; // Continue 
                }
                else if (input == "s" || input == "S")
                {
                    return true; // Break the loop
                }
                else
                {
                    WriteToConsole("Error: Input was not recognized, the current process will now continue. Press Esc to stop the operation.");
                }
            }
        }
        return false;
    }

是找到问题的确切解决方案的关键。这就是我所做的，以产生我期待的结果。我需要添加一些方法来检查用户是否想要打破当前操作或从头开始新的循环。

make-set

结果如下：

stacks question

当用户按下escape时，如何“暂停”控制台应用程序？

2 个答案: