/// <summary>Gets the ViewModel which is associated with the specified view.</summary>
/// <typeparam name="T">The type of the ViewModel</typeparam>
/// <param name="view">The view.</param>
/// <returns>The associated ViewModel, or <c>null</c> when no ViewModel was found.</returns>
/// <exception cref="ArgumentNullException">view must not be <c>null</c>.</exception>
public static T?GetViewModel <T>(this IView view) where T : class
{
if (view == null)
{
throw new ArgumentNullException(nameof(view));
}
object?dataContext = view.DataContext;
// When the DataContext is null then it might be that the ViewModel hasn't set it yet.
// Enforce it by executing the event queue of the Dispatcher.
if (dataContext == null && SynchronizationContext.Current is DispatcherSynchronizationContext)
{
DispatcherHelperCore.DoEvents();
dataContext = view.DataContext;
}
return(dataContext as T);
}
