C# 按下 ALT+KEY 时处理 KeyDown 事件
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Handle the KeyDown Event when ALT+KEY is Pressed
提问by Jedi Master Spooky
How do you handle a KeyDownevent when the ALT key is pressed simultaneously with another key in .NET?
KeyDown当 ALT 键与 .NET 中的另一个键同时按下时，您如何处理事件？
采纳答案by Jedi Master Spooky
This is the code that finally Works
这是最终有效的代码
if (e.KeyCode >= Keys.A && e.KeyCode <= Keys.Z && e.Alt){
//Do SomeThing
}
回答by Henk Holterman
Something like:
就像是：
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt)
{
e.Handled = true;
// ,,,
}
}
回答by Oded
The KeyEventArgsclass defines several properties for key modifiers - Altis one of them and will evaluate to trueif the alt key is pressed.
该KeyEventArgs类定义了几个属性的关键调节剂- Alt键就是其中之一，实际等于true如果Alt键被按下。
回答by kor_
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt && e.KeyData != (Keys.RButton | Keys.ShiftKey | Keys.Alt))
{
// ...
}
}
回答by Jim Lahman
I capture the alt and down or up arrow key to increment the value of a numericUpDown control. (I use the alt key + down/up key because this form also has a datagridview and I want down/up keys to act normally on that control.)
我捕获 alt 和向下或向上箭头键以增加 numericUpDown 控件的值。（我使用 alt 键 + 向下/向上键，因为此表单也有一个 datagridview，我希望向下/向上键在该控件上正常操作。）
private void frmAlzCalEdit_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt && e.KeyCode == Keys.Down)
{
if (nudAlz.Value > nudAlz.Minimum) nudAlz.Value--;
}
if (e.Alt && e.KeyCode == Keys.Up)
{
if (nudAlz.Value < nudAlz.Maximum) nudAlz.Value++;
}
}
回答by Hesein Burg
Create a KeyUp event for your Form or use a library like I did to get a GlobalHook so you can press these keys outside the form.
为您的表单创建一个 KeyUp 事件，或者像我一样使用库来获取 GlobalHook，这样您就可以在表单外按下这些键。
Example:
例子：
private void m_KeyboardHooks_KeyUp(object sender, KeyEventArgs e)
{
if ( e.KeyCode == Keys.Alt || e.KeyCode == Keys.X)
{
}
}
