protected TService GetService(object targetObject, DependencyProperty resolverServiceProperty)
{
if (targetObject == null)
{
throw new ArgumentNullException(nameof(targetObject));
}
if (resolverServiceProperty == null)
{
throw new ArgumentNullException(nameof(resolverServiceProperty));
}
switch (ResolverSource)
{
case ResolverServiceSource.Global:
return(GlobalServices.Get <TService>());
case ResolverServiceSource.Ancestor:
if (targetObject is DependencyObject dependencyObject)
{
var viewRegistryServiceTraverse = dependencyObject.Traverse(o => o.GetVisualParent(), o => o.GetValue(resolverServiceProperty) == null);
return(viewRegistryServiceTraverse.LastOrDefault()?.GetValue(resolverServiceProperty) as TService);
}
throw new InvalidOperationException("Ancestor resolver source available only for DependencyObjects");
case ResolverServiceSource.Direct:
return(Resolver);
default:
throw new ArgumentOutOfRangeException();
}
}
protected BaseResolver()
{
var globalService = GlobalServices.Get <TService>();
ResolverSource = globalService == null ? ResolverServiceSource.Ancestor : ResolverServiceSource.Global;
}