CODEWITHSUNDEEP
c#console-application
user19434757
user19434757

Reputation:

Loop that runs until certain key is pressed - C#

I'm trying to make a loop that runs until a certain key is pressed without breaking. I'm making a C# console app with .NET 6.0.

What I am aiming for is a loop that continuously until a certain key is pressed. This first example is what I've been using. This loop listens for the key 'L' to be pressed while the key pressed isn't 'B'. However, if a different key is pressed, say 'm', the loop becomes unresponsive and does not do anything when key 'L' or 'B' is pressed afterwards

Example 1 (source)

 do {
       if (key == ConsoleKey.L)
       {
          // Do stuff
       }
 } while (key != ConsoleKey.B);

 // Do stuff after the 'B' key is pressed

In this second example I tried, the loop is unresponsive to any form of input.

Example 2 (source)

while (!(Console.KeyAvailable && Console.ReadKey(true).Key == ConsoleKey.L))   
{
    if (Console.ReadKey(true).Key == ConsoleKey.N) 
    {
        // Do stuff
    }
}

// Do stuff when the key 'L' is pressed

Is there a fairly simple fix in which I can have a loop which runs until a certain key is pressed, without breaking when a different key is pressed?

Upvotes: 0

Views: 1860

Answers (1)

Linkruste Addict
Linkruste Addict

Reputation: 69

I wrote the solutions in static functions to be more clear.

You could use two different solutions, either use a switch statement that check the key pressed:

static void Solution1()
{
    while (!(Console.KeyAvailable))
    {
        switch (Console.ReadKey(true).Key)
        {
            case ConsoleKey.L: Console.WriteLine("L pressed"); break;
            case ConsoleKey.N: Console.WriteLine("N pressed"); break;
        }
    }
}

Or do a while loop that breaks if your key is pressed, without use a break statement (you can name "conK" variable what you want) :

static void Solution2()
{
    ConsoleKey conK = Console.ReadKey(true).Key;
    while (!Console.KeyAvailable && conK != ConsoleKey.L)
    {
        if (conK == ConsoleKey.N) Console.WriteLine("N pressed.");  // Do stuff if N is pressed
        conK = Console.ReadKey(true).Key;
    }
    Console.WriteLine("Loop broke, L pressed."); // Do stuff after L is pressed and loop broke
}

I tested both before posting, but I'm sure that the second solution is what you're looking for.

Upvotes: 3

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