Implementing and using the ICommand interface, MVVM

Question

Although I deeply fell in love with the MVVM pattern there seem to be a lot of problems I cannot (yet) figure out for myself.

I wonder what the parameters of the methods of the IComamnd interface are good for

e.g. void Execute(object parameter);

I tie my view to the view model like this

<Button Command="{Binding SomeCommand}" ... />

and so "parameter" will always be null.

Any hints are welcome.

Thanks!

Update: Darn, one minute after I posted this question I found the answer on Stackoverflow. Obviously controls do have a CommandParameter property.

Answer 1

You can add CommandParameter="" to pass a parameter. Usually you'll pass in the binding, or an id that's part of the binding, so the command knows what record to work with.