Keyboard state on MouseDown?

I may just be missing a simple call; but how do I find out if the shift, ctrl, and or alt keys are pressed when the mouse is clicked? For example, I may want to click on several objects on the screen, if the shift key is down I want to add the clicked object to the selection, but if not, I want to replace the selection with the newly clicked item. I've got everything I need to do this, but I don't know how to find out if the shift key is down when the click happens (without resorting to win32 api calls).

Code:

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if ((Control.ModifierKeys & Keys.Shift) == Keys.Shift)

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Thanks, I appreciate the reply.

I just found that after searching through reams of code...

Hi,
I just think if I want to check whether 2 control keys are pressed at the same time.
how can I do then?

Quote:

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if ((Control.ModifierKeys & Keys.Shift ) == Keys.Shift)

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the code is just checking one ModifierKeys.
Should I need to do it in 2 if-loop? or any best way?

if ((Control.ModifierKeys & Keys.Shift ) == Keys.Shift)
{
if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
.....
}

Thanks

Code:

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if ((Control.ModifierKeys & Keys.Shift ) == Keys.Shift)

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This is just checking that at least the Shift key is pressed not just the Shift key pressed.

So similarly for "Shift + Control" you have a choice of "at least" or "just" those keys pressed.

Code:

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if ((Control.ModifierKeys & (Keys.Shift | Keys.Control)) == (Keys.Shift | Keys.Control))

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OR

Code:

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if (Control.ModifierKeys == (Keys.Shift | Keys.Control))

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I actually prefer to do this:

Code:

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bool isCtrl = (Control.ModifierKeys & Keys.Control) == Keys.Control;
bool isShift = (Control.ModifierKeys & Keys.Shift) == Keys.Shift;

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This allows you to ues the values later:

Code:

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if (isCtrl && isShift)
 {
 }
 else
 {
    if (isShift)
 }

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