Where to write Relay Command?

Question

I am trying to follow standard MSDN steps to form up MVVM architecture in WPF. My folders and class hierarchy are as below.

Models => FormModel.cs ViewModels => MainViewModel.cs => ViewModelBase.cs Views => MainView.xaml

and

=> App.xaml

Please consider these above all in standard approach.

Now I want to create RelayCommand method about which I don't have any idea. Can you please tell me where to put it? Should I create a separate Command folder? Or under any of above folders? Also give an example of RelayCommand if possible as I don't know how to implement RelayCommand method.

Are you also using Prism in your MVVM Application? Then you could use `DelegateCommand` — Johannes Wanzek, Jul 29 '14 at 10:15
It should be in an MVVM package that contains the RelayCommand, ViewModelBase, Locator, ... so you can reuse it in othe rprojects. — Emond, Jul 29 '14 at 10:32

score 2 · Accepted Answer · answered Jul 29 '14 at 10:22

2

I would vote for ViewModels in this case - the implementation is only going to be used in ViewModel classes. I wouldn't create a Command folder, as it will sit in there on its own, but if you have similar constructs perhaps a Utilities folder?

Instead of reinventing the wheel, I use MVVMLight from Nuget (others are available) - has a RelayCommand implementation included, and can be used in portable class libraries (for store apps).

answered Jul 29 '14 at 10:22

kidshaw

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Utilities is a logic place to put it. You only need one implementation, copy/pasted from somewhere online. – Troels Larsen Jul 29 '14 at 11:13

Where to write Relay Command?

1 Answers1