How to programatically fire an event

[aewarnick]

I have a couple of places in my code where it would be convenient to simulate an event. I looked on the internet but could find nothing about it.

 

For example, I have a date and time picker with an event - dateTimePicker_ValueChanged

 

How do I simulate the value changed so that everything in that block executes?

[Nerseus]

Can you not just call that function directly? For the "sender" pass in the variable name itself. Pass in dummy arguments for the second one.

 

For example:

dateTimePicker1_ValueChanged(dateTimePicker1, new System.EventArgs());

 

Remember, an event is just a function. The event handler code (usually in InitializeComponent) just hooks the event to call your function, but it's still just a function.

 

-nerseus

[aewarnick]

Yep, that works. I realize that I could just take everything out of the event block and put it in a regular method (C# function) but I really wanted to know how to do that anyway.

 

Thanks.

[Heiko]

No such thing as "RaiseEvent" in C# ??

 

In VB (yes, I read your signature, but VB is my home turf) In VB you need to declare an Event

 

e.g

Public Event NothingHappened (sender as Object, e as NothingHappenedEventArgs(

[\code]

 

and then

 

[code]

RaiseEvent NothingHappened (me, New NothingHappenedEventArgs (arg1, arg2))

[\code]

 

(You could use EventArgs as the class for your arguments but I recommend always to derive your own special EventArgs class, this will reduce correction times drastically later in the project. Believe me :) )

[divil]

Events are probably the biggest difference between C# and VB. With VB, you use its helper functions to add and remove delegates, and even to call the list of delegates. In C# you have direct access to the event and you add and remove delegates yourself, and just call the delegate list like any other function.

[aewarnick]

I hope my signature does not offend anyone. If it does I will most certainly change it. Just let me know.

[Heiko]

You need a hug or what?

 

Of course I am not offended. :)

[aewarnick]

Good. Some people are just touchy and I didn't mean just you, I meant anyone.