Key Press Event

[Tim]

Hi Guys,

I want to know how to tell if the shift key is held down when another
key is pressed.

I am using the following code to make sure that only numbers, backspace
and decimal are allowed in a text box. I want to use the decimal on the

key, OemDecimal.

It can tell that the key is pressed but if the user holds the shift key
down then a > is inserted into the text box. How do I tell?

Thanks

Tim

// Determine whether the keystroke is a number from the top of the keyboard.
if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
{
// Determine whether the keystroke is a number from the keypad.
if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
{
// Determine whether the keystroke is a backspace.
if(e.KeyCode != Keys.Back && e.KeyCode != Keys.Decimal)
{
// A non-numerical keystroke was pressed.
// Set the flag to true.
nonNumberEntered = true;
}
}
}

 

[Nicholas Paldino [.NET/C# MVP]]

Tim,

You might want to catch the KeyDown or the KeyUp event. These will pass
an KeyEventArgs instance to you which has a Shift property indicating if the
shift key was pressed (as well as ALT and CTRL).

Hope this helps.

 

[Tim]

Thanks Nicholas, that was it.

 

[Tim]

Nicholas,

It only detects one key at a time. I need to detect if a key is pressed
while the shift key is held down. Any ideas?

 

[Guest]

Tim,

Nicholas was on the right track...the KeyEventArgs that is passed in each
time the KeyUp or KeyDown event is raised has a property called Shift that
returns a boolean value representing whether the shift key was pressed. It
also has properties for the Control and Alt keys as well.