代わりに keyup および keydown イベントを使用して、同時に複数のキーをリッスンするためにできることの簡単な例を次に示します。
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WinFormTest {
public partial class Form1 : Form {
private readonly IDictionary<Keys, bool> downState;
public Form1() {
InitializeComponent();
downState = new Dictionary<Keys, bool>();
downState.Add(Keys.W, false);
downState.Add(Keys.D, false);
KeyDown += remember;
KeyUp += forget;
}
protected override void OnLoad(EventArgs e) {
base.OnLoad(e);
Timer timer = new Timer() { Interval = 100 };
timer.Tick += updateGUI;
timer.Start();
}
private void remember(object sender, KeyEventArgs e) {
downState[e.KeyCode] = true;
}
private void forget(object sender, KeyEventArgs e) {
downState[e.KeyCode] = false;
}
private void updateGUI(object sender, EventArgs e) {
label1.Text = downState[Keys.W] ? "Forward" : "-";
label2.Text = downState[Keys.D] ? "Right" : "-";
}
}
}