how to load wpf usercontrol in MVVM pattern

Question

I\'m creating a wpf user control which is in mvvm pattern. So we have : view(with no code in codebehind file), viewmodel,model,dataaccess files.

I have MainWindo

Answer 1

There are endless ways to do it, wich all fall in one of the two categories:"view first" or "model first".

In a "view first" mode the view (e.g. your mainwindow) is created first and then (e.g. in the codebehind) the View instantiates the ViewModel and sets it as its datacontext):

private void WindowLoaded(object sender, EventArgs args)
{
   this.DataContext = ViewModelService.GetViewModelX();
}

In a "model first" mode the ViewModel is there first and then instanciated the View.

// method of the viewmodel 
public void LoadView()
{
     // in this example the view abstracted using an interface
     this.View = ViewService.GetViewX();
     this.View.SetDataContext(this);
     this.View.Show();    
}

The examples given here are just one way of many. You could look at the various MVVM frameworks and see how they do it.