我从 AaronLS 那里得到了答案，并为简单的单行注册重写了一点。
注册：
GlobalHotKey.RegisterHotKey("Alt + Shift + S", () => DoSomething());
班级：
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows.Input;
public class GlobalHotKey : IDisposable
{
/// <summary>
/// Registers a global hotkey
/// </summary>
/// <param name="aKeyGesture">e.g. Alt + Shift + Control + Win + S</param>
/// <param name="aAction">Action to be called when hotkey is pressed</param>
/// <returns>true, if registration succeeded, otherwise false</returns>
public static bool RegisterHotKey(string aKeyGestureString, Action aAction)
{
var c = new KeyGestureConverter();
KeyGesture aKeyGesture = (KeyGesture)c.ConvertFrom(aKeyGestureString);
return RegisterHotKey(aKeyGesture.Modifiers, aKeyGesture.Key, aAction);
}
public static bool RegisterHotKey(ModifierKeys aModifier, Key aKey, Action aAction)
{
if(aModifier == ModifierKeys.None)
{
throw new ArgumentException("Modifier must not be ModifierKeys.None");
}
if (aAction is null)
{
throw new ArgumentNullException(nameof(aAction));
}
System.Windows.Forms.Keys aVirtualKeyCode = (System.Windows.Forms.Keys)KeyInterop.VirtualKeyFromKey(aKey);
currentID = currentID + 1;
bool aRegistered = RegisterHotKey(window.Handle, currentID,
(uint)aModifier | MOD_NOREPEAT,
(uint)aVirtualKeyCode);
if(aRegistered)
{
registeredHotKeys.Add(new HotKeyWithAction(aModifier, aKey, aAction));
}
return aRegistered;
}
public void Dispose()
{
// unregister all the registered hot keys.
for (int i = currentID; i > 0; i--)
{
UnregisterHotKey(window.Handle, i);
}
// dispose the inner native window.
window.Dispose();
}
static GlobalHotKey()
{
window.KeyPressed += (s, e) =>
{
registeredHotKeys.ForEach(x =>
{
if (e.Modifier == x.Modifier && e.Key == x.Key)
{
x.Action();
}
});
};
}
private static readonly InvisibleWindowForMessages window = new InvisibleWindowForMessages();
private static int currentID;
private static uint MOD_NOREPEAT = 0x4000;
private static List<HotKeyWithAction> registeredHotKeys = new List<HotKeyWithAction>();
private class HotKeyWithAction
{
public HotKeyWithAction(ModifierKeys modifier, Key key, Action action)
{
Modifier = modifier;
Key = key;
Action = action;
}
public ModifierKeys Modifier { get; }
public Key Key { get; }
public Action Action { get; }
}
// Registers a hot key with Windows.
[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
// Unregisters the hot key with Windows.
[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
private class InvisibleWindowForMessages : System.Windows.Forms.NativeWindow, IDisposable
{
public InvisibleWindowForMessages()
{
CreateHandle(new System.Windows.Forms.CreateParams());
}
private static int WM_HOTKEY = 0x0312;
protected override void WndProc(ref System.Windows.Forms.Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_HOTKEY)
{
var aWPFKey = KeyInterop.KeyFromVirtualKey(((int)m.LParam >> 16) & 0xFFFF);
ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF);
if (KeyPressed != null)
{
KeyPressed(this, new HotKeyPressedEventArgs(modifier, aWPFKey));
}
}
}
public class HotKeyPressedEventArgs : EventArgs
{
private ModifierKeys _modifier;
private Key _key;
internal HotKeyPressedEventArgs(ModifierKeys modifier, Key key)
{
_modifier = modifier;
_key = key;
}
public ModifierKeys Modifier
{
get { return _modifier; }
}
public Key Key
{
get { return _key; }
}
}
public event EventHandler<HotKeyPressedEventArgs> KeyPressed;
#region IDisposable Members
public void Dispose()
{
this.DestroyHandle();
}
#endregion
}
}