我使用棱镜区域来创建动态TabControl
。但我在将对象从TabItem
(父视图)传递到其子区域时遇到问题。 以下是我用来构建TabControl的代码。TabControl区域,如何将参数传递给子区域? WPF - 棱镜
外壳:
XAML
<ContentControl regions:RegionManager.RegionName="ShellProjectRegion" />
ShellViewModel
regionManager.RegisterViewWithRegion(ShellProjectRegion, typeof(ProjectTabView));
ProjectTabView:
XAML
<TabControl regions:RegionManager.RegionName="ProjectTabRegion">
ProjectTabViewModel
container.RegisterType<object, ProjectView>(typeof(ProjectView).FullName);
ProjectView:
XAML
<Grid>
<ContentControl regions:RegionManager.RegionName="ProjectExplorerRegion"
regions:RegionManager.RegionContext="{Binding}" />
</Grid>
ProjectViewModel
public class ProjectViewModel : BindableBase, INavigationAware, IActiveAware {
private ProjectItem _project;
public ProjectItem Project {
get { return _project; }
set { SetProperty(ref _project, value); }
}
public ProjectViewModel(IRegionManager regionManager) {
regionManager.RegisterViewWithRegion("ProjectExplorerRegion", typeof(ProjectExplorerView));
}
public void OnNavigatedTo(NavigationContext navigationContext) {
Project = (ProjectItem)navigationContext.Parameters["project"];
}
}
个ProjectExplorerView:
xaml.cs
public ProjectExplorerView(IUnityContainer container) {
InitializeComponent();
var vm = container.Resolve<ProjectExplorerViewModel>();
RegionContext.GetObservableContext(this).PropertyChanged += (s, e) => {
var context = (ObservableObject<object>)s;
var projectVm = (ProjectViewModel)context.Value;
vm.ParentProjectInfo = projectVm.Project.ProjectInfo;
};
DataContext = vm;
}
注:请注意,在最后一块ProjectExplorerView.xaml.cs
视图构造函数中的代码被调用多次,每次新的选项卡被创建。当跟踪代码时,上下文变量有时会得到空值,有时候会有正确的值,这是我想要传递的项目。但在调用构造函数结束时它始终为空。