#626 – Key Up/Down Sequence When Using CTRL Key

When you use the Ctrl-key in combination with another key, e.g. pressing Ctrl-G, the control that has focus will receive KeyUp and KeyDown events for both the Ctrl key and the main key that you are pressing.

For example, if a TextBox control has focus and I press Ctrl-G (which doesn’t normally do anything in a TextBox) and I use the Ctrl key on the left side of the keyboard, I’ll see the following events for the TextBox, in the sequence listed.

• PreviewKeyDown, key = LeftCtrl
• KeyDown, key = LeftCtrl
• PreviewKeyDown, key = G
• KeyDown, key = G
• PreviewKeyUp, key = G
• KeyUp, key = G
• PreviewKeyUp, key = LeftCtrl
• KeyUp, key = LeftCtrl

In this case, you can see that my sequence in pressing/releasing the keys was:

• Press and hold left Ctrl key
• Press G key
• Release G key
• Release Ctrl key