How do I programatically raise an existing event within a custom control?

Question

I have made a custom class by inheriting a DateTimePicker and made some methods that allow it to be blank/null.

If the control is blank and a user clicks on it, it populates with the current date. It also raises the ValueChanged event.

If the control is populated and a user presses delete, it clears and sets its value to null, but the ValueChanged event doesn't trigger.

In the control's OnKeyDown method, I would like to include some code that raises the ValueChanged event, but there doesn't seem to be a way to do that.

Do I need to override the base class event? Is there an applicable example?

Answer 1

DateTimePicker.OnValueChanged将引发ValueChanged事件。

Answer 2

You have to call/override DateTimePicker.OnValueChanged() . This method calls the event, so you can implement your code through this.