How have you successfully implemented MessageBox.Show() functionality in MVVM?
Services to the rescue. Using Onyx (disclaimer, I’m the author) this is as easy as: public void Foo() { IDisplayMessage dm = this.View.GetService<IDisplayMessage>(); dm.Show(“Hello, world!”); } In a running application, this will indirectly call MessageBox.Show(“Hello, world!”). When testing, the IDisplayMessage service can be mocked and provided to the ViewModel to do what ever you want … Read more