导航 IRegionManager

 

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<Window x:Class="PrismWpfBlankApp.Views.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:prism="http://prismlibrary.com/"         prism:ViewModelLocator.AutoWireViewModel="True"         Title="{Binding Title}" Height="350" Width="525" >     <Grid>         <Grid.RowDefinitions>             <RowDefinition Height="Auto"></RowDefinition>             <RowDefinition></RowDefinition>         </Grid.RowDefinitions>         <StackPanel Margin="10" Orientation="Horizontal">             <Button  Margin="10" Command="{Binding GoBackCommand}" Content="上一页"></Button>             <Button  Margin="10" Command="{Binding GoForwardCommand}" Content="下一页"></Button>             <Button  Margin="10" Command="{Binding OpenACommand}" Content="打开A"></Button>             <Button  Margin="10" Command="{Binding OpenBCommand}" Content="打开B"></Button>           </StackPanel>                   <ContentControl Grid.Row="1" prism:RegionManager.RegionName="ContentRegion"/>               </Grid> </Window>

　　

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using DryIoc; using Prism.Commands; using Prism.Mvvm; using Prism.Regions; using PrismWpfBlankApp.Views; using System.Net.NetworkInformation;   namespace PrismWpfBlankApp.ViewModels {     public class MainWindowViewModel : BindableBase     {         private readonly IRegionManager m_RegionManager;         private IRegionNavigationJournal m_Journal;//导航日志         private string _title = "Prism Application";         public string Title         {             get { return _title; }             set { SetProperty(ref _title, value); }         }           public MainWindowViewModel(IRegionManager regionManager)         {             m_RegionManager = regionManager;             GoBackCommand = new DelegateCommand(GoBack);             GoForwardCommand = new DelegateCommand(GoForward);             OpenACommand = new DelegateCommand(OpenA);             OpenBCommand = new DelegateCommand(OPenB);         }         public DelegateCommand GoBackCommand { get; }         public DelegateCommand GoForwardCommand { get; }         public DelegateCommand OpenACommand { get; }         public DelegateCommand OpenBCommand { get; }         private void OpenA()         {//导航到 ViewA 视图并传递参数             NavigationParameters param = new NavigationParameters();             param.Add("Value", "Hello");             m_RegionManager.RequestNavigate("ContentRegion", "PageA", arg =>             {                 m_Journal = arg.Context.NavigationService.Journal;             }, param);               //或者使用 Http 方式,传递参数             //m_RegionManager.RequestNavigate("ContentRegion", "PageA?Value=Hello 来自查询参数");         }         private void OPenB()         {//导航到 ViewB 视图             m_RegionManager.RequestNavigate("ContentRegion", nameof(ViewB), arg =>             {                 m_Journal = arg.Context.NavigationService.Journal;             });         }         private void GoBack()         {             m_Journal.GoBack();         }         private void GoForward()         {             m_Journal.GoForward();         }     } }

　　

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using Prism.Mvvm; using Prism.Regions; using Prism.Services.Dialogs; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows;   namespace PrismWpfBlankApp.ViewModels {     public class ViewAViewModel : BindableBase, IConfirmNavigationRequest     {//INavigationAware 用于导航传递参数         //IConfirmNavigationRequest 导航离开前确认，IConfirmNavigationRequest 继承INavigationAware         private string message;           public string Message         {             get { return message; }             set { SetProperty(ref message, value); }         }         #region 接口实现         public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)         {//确认导航请求,离开当前视图前弹出提示框，以便保存未保存的数据             bool result = true;             if (MessageBox.Show("是否要离开ViewA", "提示", MessageBoxButton.OKCancel, MessageBoxImage.Question) != MessageBoxResult.OK)             {                 result = false;             }             continuationCallback?.Invoke(result);         }           /// <summary>         /// 是否重新创建导航实体         /// </summary>         /// <param name="navigationContext"></param>         /// <returns></returns>         public bool IsNavigationTarget(NavigationContext navigationContext)         {             return true;         }         /// <summary>         /// 导航离开当前页时触发         /// </summary>         /// <param name="navigationContext"></param>         public void OnNavigatedFrom(NavigationContext navigationContext)         {//旧视图           }         /// <summary>         /// 导航完成前，接收用户传递的参数以及是否允许导航等控制         /// </summary>         /// <param name="navigationContext"></param>         public void OnNavigatedTo(NavigationContext navigationContext)         {//新视图             var value = navigationContext.Parameters.GetValue<string>("Value");             if (string.IsNullOrEmpty(value) == false)             {                 Message = value.ToString();             }         }         #endregion     } }

　在App中注册导航视图：

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/// <summary>     /// Interaction logic for App.xaml     /// </summary>     public partial class App     {         protected override Window CreateShell()         {             return Container.Resolve<MainWindow>();         }           protected override void RegisterTypes(IContainerRegistry containerRegistry)         {             containerRegistry.RegisterForNavigation<ViewA>("PageA");             containerRegistry.RegisterForNavigation<ViewB>();         }     }