检测C＃控制台应用程序中按下的组合键

Question

I have a pretty simple console app thats quietly waits for a users to press a key, then performs an action based on the what key was pressed. I had some issues with it, but some helpful users over on this post pointed out where I was going wrong.

The code I currently have to handle a single key press is as follows

ConsoleKey key;
do
{
    while (!Console.KeyAvailable)
    {
        // Do something, but don't read key here
    }

    // Key is available - read it
    key = Console.ReadKey(true).Key;

    if (key == ConsoleKey.NumPad1)
    {
        Console.WriteLine(ConsoleKey.NumPad1.ToString());
    }
    else if (key == ConsoleKey.NumPad2)
    {
        Console.WriteLine(ConsoleKey.NumPad2.ToString());
    }

} while (key != ConsoleKey.Escape);

I'm wondering how I can detect when a combination of 2 or more keys is pressed. I'm not talking about the standard Ctrl + c , but rather something like Ctrl + NumPad1 . If a user presses Ctrl + NumPad1 , perform action X .

I'm really unsure how to go about doing this, as the current while loop will only loop until a single key is pressed, so wont detect the second key (assuming that its litterally impossible to press two keys at the exact same time.

Is anyone able to provide a steer in the right direction to help achieve this?

Answer 1

I guess you need to check the key modifier . Check the pseudo code below:

ConsoleKeyInfo keyInfo = Console.ReadKey();
Console.WriteLine(keyInfo.Key);
Console.WriteLine(keyInfo.Modifier);
...
if((keyInfo.Modifiers & ConsoleModifiers.Control) != 0) Console.WriteLine("CTL+");

Answer 2

If you capture the ConsoleKeyInfo , you will get additional information, including the Modifiers keys. You can query this to see if the Control key was pressed:

ConsoleKey key;

do
{
    while (!Console.KeyAvailable)
    {
        // Do something, but don't read key here
    }

    // Key is available - read it
    var keyInfo = Console.ReadKey(true);
    key = keyInfo.Key;

    if ((keyInfo.Modifiers & ConsoleModifiers.Control) != 0)
    {
        Console.Write("Ctrl + ");
    }
    if (key == ConsoleKey.NumPad1)
    {                    
        Console.WriteLine(ConsoleKey.NumPad1.ToString());
    }
    else if (key == ConsoleKey.NumPad2)
    {
        Console.WriteLine(ConsoleKey.NumPad2.ToString());
    }

} while (key != ConsoleKey.Escape);