Detecting Ctrl key being held down on application startup?

Question

When our WPF application starts, it uses Single Sign On to log in. To allow testers to simulate other users, we'd like to detect the Control button being held down on startup, and pop up a login dialog.

Stating your platform would be helpful. WinForms / WPF / Console / other ? — driis, Jun 13 '11 at 16:19

BrandonAGr · Accepted Answer · 2011-06-13T19:43:56.470

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This is what I use in a WPF app to check if the control key is being held down in the constructor of the main Window. It uses System.Windows.Input.Keyboard

if ((Keyboard.Modifiers & ModifierKeys.Control) > 0)
    PromptForMarketSelection();

EDIT - corrected bug pointed out by Coincoin

edited Jun 13 '11 at 19:43

answered Jun 13 '11 at 16:23

BrandonAGr

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Might be better with (Keyboard.Modifiers & ModifierKeys.Control) != 0 – Coincoin Jun 13 '11 at 19:40
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For .NET 3.5+ if (Keyboard.Modifiers.HasFlag(ModifierKeys.Control)) PromptForMarketSelection(); – Robear May 27 '16 at 17:53

score 1 · Answer 2 · answered Jun 13 '11 at 17:22

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A universal solution would be to p/invoke GetAsyncKeyState(VK_CONTROL), in case you can't find anything built into .NET.

answered Jun 13 '11 at 17:22

Ben Voigt

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score 0 · Answer 3 · answered Jun 13 '11 at 16:20

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Take a look at this article it used ModifierKeys to find out what you are looking for

answered Jun 13 '11 at 16:20

Haris Hasan

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Link is down. Check http://web.archive.org/web/20141020154537/http://tech.pro/tutorial/760/winforms-accessing-mouse-and-keyboard-state for a mirror to the past. – Natrium May 02 '22 at 12:16

score 0 · Answer 4 · edited May 23 '17 at 12:25

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Check out the following link...scroll down to look at the answer by Jeff Wain.

How to detect the currently pressed key?

edited May 23 '17 at 12:25

Community

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answered Jun 13 '11 at 16:22

Dave Ferguson

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Detecting Ctrl key being held down on application startup?

4 Answers4

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