在正常的"ENTER"和"ENTER"之间进行区分.和数字键盘"ENTER"按键? [英] Distinguish between normal "ENTER" and the number-pad "ENTER" keypress?
问题描述
在我的PreviewKeyDown()
处理程序中,如何区分数字键盘上的ENTER键和主板上的ENTER键?
In my PreviewKeyDown()
handler how do I tell the difference between the ENTER key on number-pad and the ENTER key on the main board?
两个键都为KeyEventArgs.Key
返回相同的值Key.Enter
.
Both keys return the same value Key.Enter
for KeyEventArgs.Key
.
The closest answer I can find to this question is here: What's the difference between Key.Enter and Key.Return?, but unfortunately this works only if the app is fully trusted.
我想要一个没有此限制的解决方案.
I'd like a solution without this restriction.
推荐答案
See link, example impl. below.
private static bool IsNumpadEnterKey(KeyEventArgs e)
{
if (e.Key != Key.Enter)
return false;
// To understand the following UGLY implementation please check this MSDN link. Suggested workaround to differentiate between the Return key and Enter key.
// https://social.msdn.microsoft.com/Forums/vstudio/en-US/b59e38f1-38a1-4da9-97ab-c9a648e60af5/whats-the-difference-between-keyenter-and-keyreturn?forum=wpf
try
{
return (bool)typeof(KeyEventArgs).InvokeMember("IsExtendedKey", BindingFlags.GetProperty | BindingFlags.NonPublic | BindingFlags.Instance, null, e, null);
}
catch (Exception ex)
{
if (AiLoggingService.IsErrorEnabled)
AiLoggingService.LogError("Could not get the internal IsExtendedKey property from KeyEventArgs. Unable to detect numpad keypresses.", ex);
}
return false;
}
如果要检查常规的EnterKey,显然应该致电
e.Key == Key.Enter && !IsNumpadEnterKey(e)
N.b. if you want to check for regular EnterKey then obviously you should call
e.Key == Key.Enter && !IsNumpadEnterKey(e)
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