Please explain the meaning of the following C# code

Question

What does the event "VisibleChanged" mean?

For example in this code of this line:

slidePane.VisibleChanged += new EventHandler(slidePane_VisibleChanged);

please add more code, for example let us know the type of the "slidePane" variable, let us know the context (in wchich method) and let us know on which platform (Silverlight, WinForms, WPF,...) — Yves Schelpe, Jan 24 '14 at 07:50

score 5 · Answer 1 · answered Jan 24 '14 at 07:51

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Here "VisibleChanged" is an event, "slidePane_VisibleChanged" is the event handler. You are to attach the event handler to that event. So when the event fires, the event handler will be invoked.

answered Jan 24 '14 at 07:51

Johnny

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score 1 · Answer 2 · edited May 23 '17 at 12:06

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Simplifying it does this: When the visibility of the slideplane is changed, invoke the event handler slidePane_VisibleChanged.

See also a more detailed explanation of event handling on SO: https://stackoverflow.com/a/803320/103139

and on MSDN: http://msdn.microsoft.com/en-us/library/aa645739(v=vs.71).aspx

edited May 23 '17 at 12:06

Community

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answered Jan 24 '14 at 07:50

bastijn

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thats not 100% correct because it add the method to the handler – WiiMaxx Jan 24 '14 at 07:51
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You are right. Edited. – bastijn Jan 24 '14 at 07:52

score 0 · Answer 3 · answered Jan 24 '14 at 07:57

This is an Event Handler attachment. You are attaching an event handler to your slidePane's VisibleChanged event. You have a method named slidePane_VisibleChanged that matches the signature of your EventHandler. When your VisibleChanged event triggered your slidePane_VisibleChanged method will be executed.

Also this line can be written like this:

slidePane.VisibleChanged += slidePane_VisibleChanged;

That is the short notation of attaching an event handler. See the documentation for more details.

Please explain the meaning of the following C# code

3 Answers3