MVVM - Share/Reuse ViewModels between Silverlight and WPF

Question

Is it possible to share viewmodels across platforms - WPF/Silverlight? I started down the path of putting my VMs in a separate assembly and soon came to ICommand - which then led me to ask this question? Is this possible, and if so is it good to do so? We have a possibility in the future of having a client application for WPF and Silverlight, so I would like to not have to duplicate VMs for both.

Answer 1

You can potentially do this using the Portable Library Tools CTP. This allows you to target the full framework as well as Silverlight in a single library project.

Otherwise, it is possible, sort of. You still need two separate projects (for practical purposes), but can typically use a single source file. Have each project using the same source files keeps the reuse in place - but does require manual synchronization of the files. You can also add platform-specific functionality easily in this case via partial classes or defines, which does help to keep some of the workarounds for missing Silverlight functionality easy to maintain.