Prism Framework project application - Navigation

stay Prism in , Use Navigation It usually takes a few steps to jump between pages ：

1. Create a new page , And realize INavigationAware Interface
2. Use IRegionManager Registration page
3. Use NavigationParameters Encapsulate the parameters of page Jump
4. Use IRegionManager.RequestNavigate() Jump to the target page

INavigationAware Interface

INavigationAware There are three interfaces ,IsNavigationTarget、OnNavigatedFrom、OnNavigatedTo It starts when you navigate the page , You can interface methods on demand , The code is as follows ： Prism Base class page

The sample code is as follows

    public class RegionViewModelBase : ViewModelBase, INavigationAware, IConfirmNavigationRequest
    {
    
        protected IRegionManager RegionManager {
     get; private set; }

        public RegionViewModelBase(IRegionManager regionManager)
        {
    
            RegionManager = regionManager;
        }

        public virtual void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)
        {
    
            continuationCallback(true);
        }
 
        public virtual bool IsNavigationTarget(NavigationContext navigationContext)
        {
    
            return true;
        }

        public virtual void OnNavigatedFrom(NavigationContext navigationContext)
        {
    

        }

        public virtual void OnNavigatedTo(NavigationContext navigationContext)
        {
    

        } 
    }

The navigated page can be inherited from RegionViewModelBase, The following code shows the rewriting OnNavigatedTo Method , stay OnNavigatedTo Starting from the related event method .

    public class ViewAViewModel : RegionViewModelBase
    {
    
        private string _message;
        public string Message
        {
    
            get {
     return _message; }
            set {
     SetProperty(ref _message, value); }
        }

        public ViewAViewModel(IRegionManager regionManager, IMessageService messageService) :
            base(regionManager)
        {
    
            Message = messageService.GetMessage();
        }

        public override void OnNavigatedTo(NavigationContext navigationContext)
        {
    
            //do something
        }
    }

Navigation code implementation

As shown in the following code , The navigation method is ：RequestNavigate, Parameters include ：（ Area , source ）

• The so-called region , That is, the page navigates to the area of the presentation page
• Source refers to , The name of the instantiated page

OnInitialized To initialize the module method

RegisterTypes To register project class methods

Both methods are executed automatically when the module is loaded . _regionManager.RequestNavigate(RegionNames.ContentRegion, “ViewA”); When the code indicates initialization , Navigation ViewA Page to main page ContentRegion Area .

    public class ModuleNameModule : IModule
    {
    
        private readonly IRegionManager _regionManager;

        public ModuleNameModule(IRegionManager regionManager)
        {
    
            _regionManager = regionManager;
        }
        /// <summary>
        ///  initialization 
        /// </summary>
        /// <param name="containerProvider"></param>
        public void OnInitialized(IContainerProvider containerProvider)
        {
    
            _regionManager.RequestNavigate(RegionNames.ContentRegion, "ViewA");
        }

        /// <summary>
        ///  Register the page into the container 
        /// </summary>
        /// <param name="containerRegistry"></param>
        public void RegisterTypes(IContainerRegistry containerRegistry)
        {
    
            containerRegistry.RegisterForNavigation<ViewA>();
        }
    }