棱镜如何在views文件夹的子文件夹中找到视图

Question

我正在研究windows store app中的棱镜.我遇到了问题.我有很多观点,我想将它们分成不同的文件夹.但问题是NavigationService无法找到它们.说明书说所有的视图显示放入views文件夹,然后导航服务可以使用navigationservice.navigate("main",null)导航到它们,但是如果视图不在导航服务找不到它们的views文件夹的根目录中

Answer 1

NavigationService根据约定查找Views和ViewModels.所有视图必须位于"视图"文件夹中,ViewModel必须位于"ViewModels"文件夹中.如果id不适合您,可以执行以下操作:

1. 将以下类添加到项目中:

   public class ViewViewModelTypeResolver
   {
       private const string ViewNameSuffix = "Page"; // You can change this View name suffix
       private const string ViewModelNameSuffix = "ViewModel"; // You can change this ViewModel name suffix
   
       private readonly Lazy<Dictionary<string, Type>> _uiAssemblyExportedTypes;
   
       private Dictionary<string, Type> UiAssemblyExportedTypes
       {
           get { return _uiAssemblyExportedTypes.Value; }
       }
   
       public ViewViewModelTypeResolver(Type typeFromUiAssembly)
       {
           _uiAssemblyExportedTypes = new Lazy<Dictionary<string, Type>>(() => GetUiAssemblyExportedTypes(typeFromUiAssembly));
       }
   
       public Type GetViewType(string viewTypeName)
       {
           return UiAssemblyExportedTypes[viewTypeName];
       }
   
       public Type GetViewModelType(Type viewType)
       {
           var pageNameWithoutSuffix = viewType.Name.Remove(viewType.Name.LastIndexOf(ViewNameSuffix, StringComparison.Ordinal));
           var viewModelName = String.Concat(pageNameWithoutSuffix, ViewModelNameSuffix);
           return UiAssemblyExportedTypes[viewModelName];
       }
   
   
       private static Dictionary<string, Type> GetUiAssemblyExportedTypes(Type typeFromUiAssembly)
       {
           return typeFromUiAssembly.GetTypeInfo().Assembly.ExportedTypes.ToDictionary(type => type.Name, type => type, StringComparer.Ordinal);
       }
   }
   

2. 将ViewViewModelTypeResolver添加到App构造函数:

   public App()
   {
       var mainPage = typeof(MainPage); // Any of pages from your solution. Pay attention that the resolver will be able to resolve Views and ViewModels that locates in the same project as specified page.
       _viewViewModelTypeResolver = new ViewViewModelTypeResolver(mainPage);
   }
   

3. 当你使用Prism时,我假设你继承了你的App类MvvmAppBase.如果是这样,你应该覆盖GetPageType方法:

       protected override Type GetPageType(string pageToken)
       {
           return _viewViewModelTypeResolver.GetViewType(pageToken);
       }
   

4. 然后添加SetDefaultViewTypeToViewModelTypeResolver在OnInitializeAsync方法:

   protected override async Task OnInitializeAsync(IActivatedEventArgs args)
   {
       // Your initialization code
   
       ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver(GetViewModelType);
   
       // Your initialization code
   }
   
   private Type GetViewModelType(Type pageType)
   {
       return _viewViewModelTypeResolver.GetViewModelType(pageType);
   }
   

现在,您可以导航到任何页面,即使它们被分成不同的文件夹.