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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
 
public class KeySequence :IEquatable<KeySequence>
{
    public KeySequence(Keys first, Keys second)
    {
        this.First = first; this.Second = second;
    }
    public Keys First { get; private set; }
    public Keys Second { get; private set; }
 
    public bool Equals(KeySequence other)
    {
        return First == other.First && Second == other.Second;
    }
 
    public override bool Equals(object obj)
    {
        return (obj as KeySequence)?.Equals(this) ?? false;
    }
    public static bool operator ==(KeySequence a, KeySequence b)
    {
        return a.Equals(b);
    }
 
    public static bool operator !=(KeySequence a, KeySequence b)
    {
        return !(a == b);
    }
}
 
public class KeyBinding
{
    public KeyBinding(Keys first, Keys second, Action action)
    {
        KeySequence = new KeySequence(first, second);
        this.Action = action;
    }
    public KeySequence KeySequence { get; private set; }
    public Action Action { get; private set; }
}
 
class KeyboardShortcutsDetector
{
    private List<KeyBinding> mKeyBindings = new List<KeyBinding>();
 
    public bool IsWaitingFor2ndKey { get; private set; }
    public Keys FirstKey { get; private set; }
 
    public void AddKeyBinding(Keys first, Keys second, Action action)
    {
        mKeyBindings.Add(new KeyBinding(first, second, action));
    }
 
    public void RemoveKeyBinding(Keys first, Keys second)
    {
        var ks = new KeySequence(first, second);
        var item = mKeyBindings.Find(x => x.KeySequence == ks);
        mKeyBindings.Remove(item);
    }
 
    public bool ProcessKey(Keys keyData)
    {
        return IsWaitingFor2ndKey ? Process2ndKey(keyData) : Process1stsKey(keyData);
    }
 
    private bool Process1stsKey(Keys keyData)
    {
        if(mKeyBindings.Any(x => x.KeySequence.First == keyData))
        {
            FirstKey = keyData;
            IsWaitingFor2ndKey = true;
            return true;
        }
        return false;
    }
 
    private bool Process2ndKey(Keys keyData)
    {
        IsWaitingFor2ndKey = false;
        var ks = new KeySequence(FirstKey, keyData);
        var keyBinding = mKeyBindings.Find(x => x.KeySequence == ks);
        keyBinding?.Action();
        return keyBinding != null;
    }
}
 

prog.cs(4,22): error CS0234: The type or namespace name `Forms' does not exist in the namespace `System.Windows'. Are you missing `System.Windows.Forms' assembly reference?
prog.cs(8,24): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(8,36): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(12,12): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(13,12): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(6,14): warning CS0661: `KeySequence' defines operator == or operator != but does not override Object.GetHashCode()
prog.cs(6,14): warning CS0659: `KeySequence' overrides Object.Equals(object) but does not override Object.GetHashCode()
prog.cs(37,23): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(37,35): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(51,12): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(53,31): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(53,43): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(58,34): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(58,46): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(65,28): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(70,33): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
prog.cs(81,32): error CS0246: The type or namespace name `Keys' could not be found. Are you missing an assembly reference?
Compilation failed: 15 error(s), 2 warnings

Standard output is empty