Question

I have a view that allows the user to select some data : some dates for example, and executes a command that needs these data.

So in my command I should have a reference to the selected date, but what is the best practice to make this date go to the ViewModel side where the command lives :

• to add a SelectedDate dependency property in the ViewModel and bind my view on it, and reference it in my command via “@this.SelectedDate” (with @this a reference to the current ViewModel),
• to let the view transmit it through the “parameter” of the “Execute” method of the command, and reference the date with “DateTime selectedDate = (DateTime)parameter;”,
• any other solution…

Thanks by advance.

Answer 1

I’d make SelectedDate a dependency property of the view model, absolutely.

I’d also make the command get the SelectedDate from the view model. There’s no reason for the view to know anything about that.