如何在C＃的控制台应用程序中使用键盘输入停止正在运行的方法？ [英] How to stop a running method with keyboard input in a Console Application on C#?

问题描述

简而言之，我正在利用C＃进行科学计算，并且编写了一种具有while循环的方法，该方法可能会运行到用户指定的步骤数量...实际上，此方法可能需要太长时间才能执行（例如超过5小时）。当花费这么长时间时，例如，我可能想停止按 Esc 键的方法。

In short, I'm utilizing C# to scientific computation and I've written a method that has a while loop that may run to a user-specified quantity of steps... Actually, this method may take too long to execute (like more than 5 hours). When it takes this long, I may want to stop the method pressing Esc key, for example.

当我读到有关破坏<$的信息时c $ c>而时，它就像 Boolean 标志或类似的东西一样简单。所以我想这样的事情：

As I read something about breaking while, it is as simple as a Boolean flag or something like this. So I thought in something like this:

public Double? Run(int n)
{
    int i = 0;
    while ((i < n) && (/* inputkey != ConsoleKey.Escape */))
    {
        // here goes the heavy computation thing
        // and I need to read some "inputkey" as well to break this loop
        i++;
    }
    // I'm not worried about the return statement, as it is easy to do...
    // returns null if the user skipped the method by pressing Escape
    // returns null if the method didn't converged
    // returns the double value that the method calculated otherwise
}

好吧，这是我一直想知道的...所以，请问您能在这个程度上给出有用的想法吗？我该如何等待用户输入（我想到了 Events ，但是我不确定如何在此处实现它，并且我认为这会使代码变慢，如果我每隔一段时间都要听一个键，代码就会进入...

Well, this is what I wondered until now... So please, could you give useful ideas to this extent? How can I wait for a user input (I thought about Events, but I'm not sure how to implement it here and I think that it will make the code even slower, if I have to listen to a key at every while step the code goes into...

那么，有什么想法或意见吗？

Well, any ideas or comments?

更新：我认为我应该更好地描述这个问题。您给我的所有解决方案都可以解决我提出的这个问题，但是我认为我对自己的实际问题并不完全可靠。我不知道该问另一个问题还是继续解决这个问题...

Update: I think I should have had described better the problem. All the solutions you gave me may solve this problem I proposed, but I think I was not completely reliable to my real problem. I don't know if I should ask another question or keep with this one...

推荐答案

您可以从单独的线程运行此方法，并在按下键时设置停止变量：

You could run this method from a separate thread and set a stop variable when a key is pressed:

object myLock = new object();
bool stopProcessing = false;

public Double? Run(int n)
{
    int i = 0;
    while (i < n)
    {
        lock(myLock)
        {
            if(stopProcessing)
                break;
        }
        // here goes the heavy computation thing
        // and I need to read some "inputkey" as well to break this loop
        i++;
    }
}

，当按下一个键时，相应地更新stopProcessing：

and when a key is pressed, update stopProcessing accordingly:

Console.ReadKey();
lock(myLock)
{
    stopProcessing = true;
}

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