How to detect if multiple keys are pressed in C# forms

问题

I have looked for a solution to detect if multiple keys are pressed in C# (I couldn't find a solution!). I have this game with two players and I need to detect if a key is pressed to move them around. (I'm Using C# Forms) I've only found answers to detect if two keys are held down at the same time and they didn't help.

--EDIT--

How to detect if a key is pressed using KeyPressed (C#)

回答1:

The source of the problems is that this simple request is simply not supported under Winforms.

Sounds weird? It is. Winforms is often painfully close to the hardware layers and while this may be quite interesting at times, it also may be just a pita..

((One hidden hint by Hans should be noted: In the KeyUp you get told which key was released so you can keep track of as many keys as you want..))

But now for a direct solution that desn't require you to keep a bunch of bools around and manage them in the KeyDown and KeyUp events..: Enter Keyboard.IsKeyDown.

With it code like this works:

Uses the Keyboard.IsKeyDown to determine if a key is down. e is an instance of KeyEventArgs.

if (Keyboard.IsKeyDown(Key.Return)) {
    btnIsDown.Background = Brushes.Red; }
...

Of course you can ceck for multiple key as well:

if (Keyboard.IsKeyDown(Key.A) && Keyboard.IsKeyDown(Key.W)) ...

The only requirement is that you borrow this from WPF:

First: Add the namespace:

using System.Windows.Input;

Then: Add two references to the project:

PresentationCore
WindowsBase

Now you can test the keyboard at any time, including the KeyPress event..

回答2:

Maybe for printing to the console...

if (Input.GetKeyDown(KeyCode.G))     {print ("G key pressed");}

回答3:

You can achieve it using program level keyboard hook. You can use Win-API functions like SetWindowsHookEx in user32.dll.

Here are some examples of it :

A Simple C# Global Keyboard Hook
Global keyboard capture in C# application

来源：https://stackoverflow.com/questions/37881046/how-to-detect-if-multiple-keys-are-pressed-in-c-sharp-forms