handle an event and attach a command in the same time

I have got a question about event and bound command.

What happens if I bound a command to my button and also handle the click event in my code behind ?

I mean, I have already tried and everything is ok but I was wondering whether this affects the efficiency or something else ? Is it a good practice ?

In my case the code behind is just to close a 开发者_如何学运维window after it has executed a command.

thank you everybody

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This is definitely not a best practice, since they are two different ways of achieving the same outcome. What you may want to do investigate as a solution, is passing a callback as the parameter (or part of the parameter object) of your command and have the command call the method/callback.

If you must, you can also specify, with a flag, whether the callback should be called before of after the command's code block completes.

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It's deterministic, but I only think it's "good practice" if:

• Your command is providing some business logic AND
• The click event is being handled to do something purely view-related, such as begin a storyboard.

You could always trigger the view response from the viewmodel instead if you wanted (in my example you could use a datastatebehavior)