CODEWITHSUNDEEP
c#keykeyboard-shortcutskeydownmodifier-key
jsmith
jsmith

Reputation: 7278

How to use multiple modifier keys in C#

I am using a keydown event to detect keys pressed and have several key combinations for various operations.

if (e.KeyCode == Keys.C && e.Modifiers == Keys.Control && e.Modifiers == Keys.Shift)
{
    //Do work
}
else if (e.KeyCode == Keys.V && e.Modifiers == Keys.Control)
{
    //Paste
}

For some reason the key combination in which I hit Ctrl + Shift + C is not working. I have re ordered them, and placed it at the top thinking it might be interference from the Ctrl + C, and even removed the Ctrl + C to see if it was causing a problem. It still does not work. I know it's probably something very simple, but can't quite grasp what it is. All of my 1 modifier + 1 key combination's work fine, as soon as I add a second modifier is when it no longer works.

Upvotes: 28

Views: 49566

Answers (9)

Ahmad Kelany
Ahmad Kelany

Reputation: 476

Another approach more suitable if you have more cases, and easier to read is:

private void Form_KeyDown(object sender, KeyEventArgs e)
{
    Action action = e.KeyData switch
    {
      (Keys.Control | Keys.Shift | Keys.C) => DoWork,
      (Keys.Control | Keys.V) => Paste,
      _ => null
    };
    action?.Invoke();
}
private void DoWork() 
{ // do work }
private void Paste() 
{ // paste }

Upvotes: 0

Martin
Martin

Reputation: 1

Seeing as no one else mentions them, i'm just going to leave the suggestion to use KeyEventArgs.KeyData:

if (e.KeyData == (Keys.C | Keys.Control | Keys.Shift)
{
  //do stuff
  //potentially use e.Handled = true
}
if (e.KeyData == (Keys.V | Keys.Control)
{
  //do other stuff
  //potentially use e.Handled = true
}

This should only act on specific key combinations, though the order of the modifiers don't seem to matter, the first one is always the last pressed key.

And e.Handled = true should stop it, though i don't know the specific mechanics behind it.

Upvotes: 0

Chris
Chris

Reputation: 33

This is what I did for a Ctrl+Z Undo and Ctrl+Shift+Z Redo operation and it worked.

  Private Sub Form_Main_KeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown
    Select Case e.KeyCode
      Case Keys.Add
        diagramView.ZoomIn()
      Case Keys.Subtract
        diagramView.ZoomOut()
      Case Keys.Z
        If e.Modifiers = Keys.Control + Keys.Shift Then
          diagram.UndoManager.Redo()
        ElseIf e.Modifiers = Keys.Control Then
          diagram.UndoManager.Undo()
        End If
    End Select
  End Sub

Upvotes: 1

Stephane Ehret
Stephane Ehret

Reputation: 350

      if ((Keyboard.Modifiers & ModifierKeys.Shift | ModifierKeys.Control) > 0)
          Debugger.Launch();

Upvotes: 3

Chris J
Chris J

Reputation: 2206

Have you tried e.Modifiers == (Keys.Control | Keys.Shift)?

Upvotes: 9

Druid
Druid

Reputation: 6453

Another way would be to add an invisible menu item, assign the Ctrl + Shift + C shortcut to it, and handle the event there.

Upvotes: 2

JDunkerley
JDunkerley

Reputation: 12505

If you want to allow Ctrl and Shift then use the bitwise OR (as Keys is a Flags enum)

if (e.KeyCode == Keys.C && e.Modifiers == (Keys.Control | Keys.Shift))
{
    //Do work (if Ctrl-Shift-C is pressed, but not if Alt is pressed as well)
}
else if (e.KeyCode == Keys.V && e.Modifiers == Keys.Control)
{
    //Paste (if Ctrl is only modifier pressed)
}

This will fail if Alt is pressed as well

Upvotes: 6

Donut
Donut

Reputation: 112835

Try this. Should behave the way you want it to, and it's a little simpler.

 if (e.Control)
 {
    if (e.Shift && e.KeyCode == Keys.C)
    {
       //Do work
    }
    else if (e.KeyCode == Keys.V)
    {
       //Paste
    }
 }

Upvotes: 0

Rom
Rom

Reputation: 4199

if (e.KeyCode == Keys.C && e.Modifiers == (Keys.Control | Keys.Shift))
{
    //Do work
}
else if (e.KeyCode == Keys.V && e.Modifiers == Keys.Control)
{
    //Paste
}

Upvotes: 49

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