注册导航页面
注册区域
使用p:RegionManager.RegionName注册页面区域
<Window x:Class="WpfApp1.NavigationWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:WpfApp1"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:p="http://prismlibrary.com/"Title="NavigationWindow"Width="800"Height="450"mc:Ignorable="d"><DockPanel><Grid Width="220" DockPanel.Dock="Left"><StackPanel><Button Margin="0,3"Command="{Binding OpenViewCommand}"CommandParameter="ViewA"Content="View A" /><Button Margin="0,3"Command="{Binding OpenViewCommand}"CommandParameter="ViewB"Content="View B" /><Button Margin="0,3" Content="View C" /></StackPanel></Grid><Grid><!--<ContentControl p:RegionManager.RegionName="ViewRegion"/>--><TabControl p:RegionManager.RegionName="ViewRegion"><TabControl.ItemContainerStyle><Style TargetType="TabItem"><!-- TabItem的绑定数据源是页面对象 --><!-- TabItem的DataContext=View对象 --><!-- View对象的DataContext=对应的ViewModel --><Setter Property="Header" Value="{Binding DataContext.Title}" /></Style></TabControl.ItemContainerStyle></TabControl></Grid></DockPanel> </Window>
public class NavigationWindowVewModel{public ICommand OpenViewCommand { get; set; }// 区域管理，需要拿到RegionManager IRegionManager _regionManager;public NavigationWindowVewModel(IRegionManager regionManager){_regionManager = regionManager;OpenViewCommand = new DelegateCommand<string>(DoOpenView);}private void DoOpenView(string viewName){_regionManager.RegisterViewWithRegion("ViewRegion", viewName);}}
public class Startup : PrismBootstrapper{protected override DependencyObject CreateShell(){return Container.Resolve<NavigationWindow>();//return Container.Resolve<MainWindow>(); }protected override void RegisterTypes(IContainerRegistry containerRegistry){containerRegistry.RegisterForNavigation<ViewA>();containerRegistry.RegisterForNavigation<ViewB>();}protected override void ConfigureViewModelLocator(){base.ConfigureViewModelLocator();ViewModelLocationProvider.Register(typeof(NavigationWindow).ToString(), typeof(NavigationWindowVewModel));}}
<UserControl x:Class="WpfApp1.Views.ViewA"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:WpfApp1.Views"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"d:DesignHeight="450"d:DesignWidth="800"mc:Ignorable="d"><StackPanel><TextBox FontSize="20" Foreground="Orange" Text="View A" /><TextBlock FontSize="20" Foreground="Red" Text="{Binding Title}" /><Button Command="{Binding CloseTabCommand}" Content="Close" /></StackPanel> </UserControl>
<UserControl x:Class="WpfApp1.Views.ViewB"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:local="clr-namespace:WpfApp1.Views"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"d:DesignHeight="450"d:DesignWidth="800"mc:Ignorable="d"><Grid><TextBlock FontSize="20" Foreground="Green" Text="View B" /></Grid> </UserControl>
public class ViewAViewModel {public string Title { get; set; } = "View A";public ICommand CloseTabCommand { get; set; }IRegionManager _regionManager;public ViewAViewModel(IRegionManager regionManager){_regionManager = regionManager;CloseTabCommand = new DelegateCommand(DoCloseTab);}private void DoCloseTab(){}}
public class ViewBViewModel {public string Title { get; set; } = "View B";public ICommand CloseTabCommand { get; set; }IRegionManager _regionManager;public ViewBViewModel(IRegionManager regionManager){_regionManager = regionManager;CloseTabCommand = new DelegateCommand(DoCloseTab);}private void DoCloseTab(){} }
导航页面传参——INavigationAware接口
public class ViewAViewModel : INavigationAware{public string Title { get; set; } = "View A";public ICommand CloseTabCommand { get; set; }IRegionManager _regionManager;public ViewAViewModel(IRegionManager regionManager){_regionManager = regionManager;CloseTabCommand = new DelegateCommand(DoCloseTab);}private void DoCloseTab(){}#region INavigationAware接口方法public bool IsNavigationTarget(NavigationContext navigationContext){// 是否允许重复导航进来// 主-》A-》B-》A (显示前对象) 返回True// 主-》A-》B-》A（新对象） 返回falsereturn true;// 编辑页面，通过主页的子项点击，打开这个页面，// 子项有很多，可能同时打开多个子项进行编辑 }public void OnNavigatedFrom(NavigationContext navigationContext){// 从当前View导航出去的时候触发// 从某个页面跳转到另一个页面的时候，可以把这个信息带过去navigationContext.Parameters.Add("abcd", "Hello ViewA");}public void OnNavigatedTo(NavigationContext navigationContext){// 打开当前View的时候触发string arg = navigationContext.Parameters.GetValue<string>("abcd");}#endregion}
public class NavigationWindowVewModel{public ICommand OpenViewCommand { get; set; }// 区域管理，需要拿到RegionManager IRegionManager _regionManager;public NavigationWindowVewModel(IRegionManager regionManager){_regionManager = regionManager;OpenViewCommand = new DelegateCommand<string>(DoOpenView);}private void DoOpenView(string viewName){//_regionManager.RegisterViewWithRegion("ViewRegion", viewName);// 向某个View中传递特定参数，参数对接到View的ViewModel里if (viewName == "ViewA"){NavigationParameters parameters = new NavigationParameters();parameters.Add("abcd", "Hello");_regionManager.RequestNavigate("ViewRegion", viewName, parameters);}else if (viewName == "ViewB")_regionManager.RequestNavigate("ViewRegion", viewName);}}
自动销毁——IRegionMemberLifetime接口
页面的ViewModel继承IRegionMemberLifetime接口
接口中的KeepAlive参数默认为true：非激活状态，在Region中保留
public class ViewAViewModel : INavigationAware , IRegionMemberLifetime{public string Title { get; set; } = "View A";public ICommand CloseTabCommand { get; set; }IRegionManager _regionManager;public ViewAViewModel(IRegionManager regionManager){_regionManager = regionManager;CloseTabCommand = new DelegateCommand(DoCloseTab);}public bool KeepAlive => false;private void DoCloseTab(){}#region INavigationAware接口方法public bool IsNavigationTarget(NavigationContext navigationContext){// 是否允许重复导航进来// 主-》A-》B-》A (显示前对象) 返回True// 主-》A-》B-》A（新对象） 返回falsereturn true;// 编辑页面，通过主页的子项点击，打开这个页面，// 子项有很多，可能同时打开多个子项进行编辑 }public void OnNavigatedFrom(NavigationContext navigationContext){// 从当前View导航出去的时候触发// 从某个页面跳转到另一个页面的时候，可以把这个信息带过去navigationContext.Parameters.Add("abcd", "Hello ViewA");}public void OnNavigatedTo(NavigationContext navigationContext){// 打开当前View的时候触发string arg = navigationContext.Parameters.GetValue<string>("abcd");}#endregion}
页面离开前的事件——IConfirmNavigationRequest接口
页面ViewModel实现IConfirmNavigationRequest接口
public class ViewAViewModel : INavigationAware，IRegionMemberLifetime，IConfirmNavigationRequest{public string Title { get; set; } = "View A";public ICommand CloseTabCommand { get; set; }IRegionManager _regionManager;public ViewAViewModel(IRegionManager regionManager){_regionManager = regionManager;CloseTabCommand = new DelegateCommand(DoCloseTab);}private void DoCloseTab(){}#region IRegionMemberLifetime接口方法// 用来控制当前页面非激活状态，是否在Region中保留public bool KeepAlive => true;#endregion#region INavigationAware接口方法#region INavigationAware接口方法public bool IsNavigationTarget(NavigationContext navigationContext){// 是否允许重复导航进来// 主-》A-》B-》A (显示前对象) 返回True// 主-》A-》B-》A（新对象） 返回falsereturn true;// 编辑页面，通过主页的子项点击，打开这个页面，// 子项有很多，可能同时打开多个子项进行编辑 }public void OnNavigatedFrom(NavigationContext navigationContext){// 从当前View导航出去的时候触发// 从某个页面跳转到另一个页面的时候，可以把这个信息带过去navigationContext.Parameters.Add("abcd", "Hello ViewA");}public void OnNavigatedTo(NavigationContext navigationContext){// 打开当前View的时候触发string arg = navigationContext.Parameters.GetValue<string>("abcd");}#endregion#region IConfirmNavigationRequest接口方法// 当从当前页面跳转到另一个页面时触发// OnNavigatedFrom调用前执行public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback){// 打开某个页面，if (MessageBox.Show("是否离开当前页面？", "导航提示", MessageBoxButton.YesNo) ==MessageBoxResult.Yes){/// 继续打开/// continuationCallback?.Invoke(true);}else// 不被导航continuationCallback?.Invoke(false);}#endregion}
导航日志
编写测试程序
public class Startup : PrismBootstrapper
{protected override DependencyObject CreateShell(){return Container.Resolve<PrismRegion.Journal.Views.MainView>();}protected override void RegisterTypes(IContainerRegistry containerRegistry){containerRegistry.RegisterForNavigation<PrismRegion.Journal.Views.ViewA>();containerRegistry.RegisterForNavigation<PrismRegion.Journal.Views.ViewB>();containerRegistry.RegisterForNavigation<PrismRegion.Journal.Views.ViewC>();}
}public partial class App : Application
{public App(){new Startup().Run();}
}<Window x:Class="Zhaoxi.PrismRegion.Journal.Views.MainView"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:Zhaoxi.PrismRegion.Journal.Views"xmlns:p="http://prismlibrary.com/"mc:Ignorable="d"Title="MainView" Height="450" Width="800"><Grid><Button Content="Load Views" Command="{Binding BtnLoadCommand}" VerticalAlignment="Top"/><ContentControl p:RegionManager.RegionName="MainRegion" Margin="0,30,0,0"/></Grid>
</Window>public class MainViewModel
{public DelegateCommand BtnLoadCommand { get; set; }public MainViewModel(IRegionManager regionManager){BtnLoadCommand = new DelegateCommand(() =>{regionManager.RequestNavigate("MainRegion", "ViewA");});}
}<UserControl x:Class="Zhaoxi.PrismRegion.Journal.Views.ViewA"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:Zhaoxi.PrismRegion.Journal.Views"mc:Ignorable="d" FontSize="20"d:DesignHeight="450" d:DesignWidth="800"><Grid><StackPanel><TextBlock Text="View A" Foreground="Orange" /><Button Content="向后" Command="{Binding GoBackCommand}"/><Button Content="向前" Command="{Binding ForwordCommand}"/></StackPanel></Grid>
</UserControl>页面的ViewModel继承INavigationAware接口
在OnNavigatedTo方法中取出navigationContext.NavigationService.Journal
journal.GoBack()提供导航回退
public class ViewAViewModel : INavigationAware
{public DelegateCommand GoBackCommand { get; set; }public DelegateCommand ForwordCommand { get; set; }IRegionNavigationJournal journal;public ViewAViewModel(IRegionManager regionManager){GoBackCommand = new DelegateCommand(() =>{if (journal.CanGoBack){journal.GoBack();}});ForwordCommand = new DelegateCommand(() =>{if (journal.CanGoForward){journal.GoForward();}else{regionManager.RequestNavigate("MainRegion", "ViewB");}});}public void OnNavigatedTo(NavigationContext navigationContext){journal = navigationContext.NavigationService.Journal;}public bool IsNavigationTarget(NavigationContext navigationContext){return true;}public void OnNavigatedFrom(NavigationContext navigationContext){}
}参照ViewA写ViewB和ViewC
修改对应ViewModel的GoBackCommand与ForwordCommand
public ViewBViewModel(IRegionManager regionManager)
{GoBackCommand = new DelegateCommand(() =>{if (journal.CanGoBack){journal.GoBack();}});ForwordCommand = new DelegateCommand(() =>{if (journal.CanGoForward){journal.GoForward();}else{regionManager.RequestNavigate("MainRegion", "ViewC");}});
}public ViewCViewModel(IRegionManager regionManager)
{GoBackCommand = new DelegateCommand(() =>{if (journal.CanGoBack){journal.GoBack();}});ForwordCommand = new DelegateCommand(() =>{if (journal.CanGoForward){journal.GoForward();}});
}运行后实现导航的前进后退
取消导航——IJournalAware
在ViewB的ViewModel中继承IJournalAware接口，并在实现方法中返回false。
public class ViewBViewModel : INavigationAware, IJournalAware
{public DelegateCommand GoBackCommand { get; set; }public DelegateCommand ForwordCommand { get; set; }IRegionNavigationJournal journal;public ViewBViewModel(IRegionManager regionManager){GoBackCommand = new DelegateCommand(() =>{if (journal.CanGoBack){journal.GoBack();}});ForwordCommand = new DelegateCommand(() =>{if (journal.CanGoForward){journal.GoForward();}else{regionManager.RequestNavigate("MainRegion", "ViewC");}});}public void OnNavigatedTo(NavigationContext navigationContext){journal = navigationContext.NavigationService.Journal;}public bool IsNavigationTarget(NavigationContext navigationContext){return true;}public void OnNavigatedFrom(NavigationContext navigationContext){}// IJournalAware的方法实现 public bool PersistInHistory(){return false;}
}运行后，导航会取消ViewB的导航
来源:https://www.cnblogs.com/ZHIZRL/p/17883434.html
