如何确定在c#中是否单击了右键Ctrl/Shift/Alt或左键

Question

我想在c#中使用右/左控制/Shift/Alt但是当我输入

 private void Form1_KeyDown(or KeyPress)(object sender, KeyEventArgs e)
    {
        if (e.Modifiers == Keys.RControlKey) //(or e.KeyCode)
        {
            //Code
        }
    }

但它不工作…Shift和Alt也一样

那么这里有什么问题呢?

Answer 1

在KeyEventArgs中有属性Ctrl, Alt和Shift显示这些按钮是否被按下。或者你可以执行checkif (keyboard。iskeydown (key。p) &&

Answer 2

不确定这是否解决了你的问题。

 private void Form1_KeyUp(object sender, KeyEventArgs e)
 {
    switch(e.KeyCode)
    {
    case Keys.LMenu:
    //Your code for Left Alt Key
    break;
    case Keys.LControlKey:
    //Your code for Left Control Key
    break;
    case Keys.LShiftKey:
    //Your code for Left Shift Key
    break;
    case Keys.RControlKey:
    //Your code for Right Control Key
    break;
    case Keys.RMenu:
    //Your code for Right Alt Key
    break;
    case Keys.RShiftKey:
    //You code for Right Shift Key
    break;
    }
}

KeyUp事件:

https://msdn.microsoft.com/en-us/library/system.windows.forms.control.keyup (v = vs.110) . aspx

键:

https://msdn.microsoft.com/en-US/library/system.windows.forms.keys (v = vs.110) . aspx

Answer 3

，如果你按下RControlKey+A，它会创建几个事件。

private void watcher_keyDown(object sender, KeyEventArgs e)
{
    Console.WriteLine("keyDown: " + e.KeyData.ToString());
}
private void watcher_KeyPress(object sender, KeyPressEventArgs e)
{
    Console.WriteLine("keyPress: " + e.KeyChar.ToString());
}
public void watcher_KeyUp(object sender, KeyEventArgs e)
{
    Console.WriteLine("keyUp: " + e.KeyData.ToString());
}
keyDown: RControlKey
keyDown: A, Control
keyPress: 
keyUp: A, Control
keyUp: RControlKey, Control

从第一个或最后一个事件，您可以知道哪个(左或右)被点击。这意味着你可能需要缓存键代码，因为有2个keyUp/keyDown事件。