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如何以编程方式引发自定义控件中的现有事件？

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

原文 2010-06-26 02:14:28 3 2 c#/ winforms/ events

I have made a custom class by inheriting a DateTimePicker and made some methods that allow it to be blank/null. 我通过继承DateTimePicker制作了一个自定义类，并做了一些使它为空/空的方法。

If the control is blank and a user clicks on it, it populates with the current date. 如果控件为空白，并且用户单击它，则会使用当前日期填充该控件。 It also raises the ValueChanged event. 它还引发ValueChanged事件。

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. 如果已填充控件，并且用户按Delete键，则它将清除并将其值设置为null，但不会触发 ValueChanged事件。

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. 在控件的OnKeyDown方法中，我想包含一些引发ValueChanged事件的代码，但似乎没有办法做到这一点。

Do I need to override the base class event? 我需要覆盖基类事件吗？ Is there an applicable example? 有适用的例子吗？

2 个解决方案

DateTimePicker.OnValueChanged将引发ValueChanged事件。

You have to call/override DateTimePicker.OnValueChanged() . 您必须调用/重写DateTimePicker.OnValueChanged() 。 This method calls the event, so you can implement your code through this. 此方法调用事件，因此您可以通过此方法实现代码。

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