C#：在文本框的 keydown 事件中，如何检测当前按下的修饰符 + 键？

Question

C#: In the keydown event of a textbox, how do you detect currently pressed modifiers + keys?

I did the following, but I'm not too familiar with these operators so I'm not sure if and what I'm doing wrong.

    private void txtShortcut_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Modifiers == (Keys.Alt || Keys.Control || Keys.Shift))
        {
            lbLogger.Items.Add(e.Modifiers.ToString() + " + " +
                "show non-modifier key being pressed here");
        }
    }

1) How would I check if e contains any modifier keys?

Answer 1

according to msdn linkt

private void txtShortcut_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Alt || e.Control || e.Shift))
        {
            lbLogger.Items.Add(e.ToString() + " + " +
                "show non-modifier key being pressed here");
        }
    }

Answer 2

The documentation says it is a bitwise combination, but you're doing a logical OR.

Try:

if (e.Modifiers & (Keys.Alt | Keys.Control | Keys.Shift))
{
    lbLogger.Items.Add(e.Modifiers.ToString() + " + " +
        "show non-modifier key being pressed here");
}

And I think you can get the actual key with e.KeyCode.ToString().