IUrlLocator class is responsible for resolving the right urls for the xaml views for a view model in navigation based applications. Before Catel 3.0, the
INavigationService was responsible for resolving the url, but this responsibility is now taken over by the
NavigationService internally uses the
IUrlLocator to resolve the views.
Resolving by naming convention
It is possible to resolve views using the
IUrlLocator. Then you can use the
ResolveUrl method to resolve the url based on the type of the view model.
For example, the following view model:
will be resolved as:
Note that the
UrlLocator checks whether the resource actually exists. If the resource does not exists, it will not be able to resolve a view
Manually resolving a naming convention
To manually resolve a naming convention, use the following code:
var urlLocator = ServiceLocator.Instance.ResolveType<IUrlLocator>(); var url = urlLocator.ResolveUrl(typeof(MyViewModel));
Customizing naming conventions
By default, the
IUrlLocator uses the following naming conventions to resolve urls:
For more information about naming conventions, see Naming conventions
However, it is possible to add or remove new naming conventions to support your own naming convention. For example, to add a new naming convention for a different assembly, use this code:
var urlLocator = ServiceLocator.Instance.ResolveType<IUrlLocator>(); urlLocator.NamingConventions.Add("/MyPages/[VM]Page.xaml");
Registering custom urls
Sometimes, a class doesn’t follow a naming convention (for whatever reason possible). In such a case, it is possible to register a mapping manually using the following code:
var urlLocator = ServiceLocator.Instance.ResolveType<IUrlLocator>(); urlLocator.Register(typeof(MyViewModelNotFollowingNamingConvention), "/MyVerySpecialUrl.xaml");
Using a custom UrlLocator
If you want to have total freedom to determine which url is provided per view model (maybe there are other services that have an impact on this), it is possible to create a custom
IUrlLocator implementation. Then the only thing to do is to register it using the following code:
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