WPF---Prism视图传参

Prism视图传参方式。

实际应用场景

点击tabitem中的列表数据，同步更新到ListStatic Region对应的界面。目前用两种方式实现了传参数据同步。

第一，事件聚合器（EventAggregator）

1. 定义事件

创建一个事件类，用于传递数据。

using Prism.Events;  public class DataUpdateEvent : PubSubEvent<string> { } 

点击tabitem中的列表 ，示例传参数据是string类型，什么参数类型都可以。

2. 注册事件聚合器

在 App.xaml.cs 中注册事件聚合器。

protected override void RegisterTypes(IContainerRegistry containerRegistry) {     containerRegistry.RegisterSingleton<IEventAggregator, EventAggregator>();     containerRegistry.RegisterForNavigation<Tab1View, Tab1ViewModel>();     containerRegistry.RegisterForNavigation<ListStaticView, ListStaticViewModel>(); } 

3. 定义视图和视图模型

Tab1View.xaml

<UserControl x:Class="YourNamespace.Tab1View"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"              xmlns:prism="http://prismlibrary.com/">     <Grid>         <DataGrid ItemsSource="{Binding DataList}" SelectedItem="{Binding SelectedItem}">             <i:Interaction.Triggers>                 <i:EventTrigger EventName="SelectionChanged">                     <prism:InvokeCommandAction Command="{Binding ItemSelectedCommand}" CommandParameter="{Binding SelectedItem, RelativeSource={RelativeSource AncestorType=DataGrid}}"/>                 </i:EventTrigger>             </i:Interaction.Triggers>         </DataGrid>     </Grid> </UserControl> 

Tab1ViewModel.cs

using Prism.Commands; using Prism.Mvvm; using Prism.Events; using System.Collections.ObjectModel;  public class Tab1ViewModel : BindableBase {     private readonly IEventAggregator _eventAggregator;     private string _selectedItem;      public ObservableCollection<string> DataList { get; private set; }     public string SelectedItem     {         get { return _selectedItem; }         set { SetProperty(ref _selectedItem, value); }     }      public DelegateCommand<string> ItemSelectedCommand { get; private set; }      public Tab1ViewModel(IEventAggregator eventAggregator)     {         _eventAggregator = eventAggregator;         DataList = new ObservableCollection<string> { "Item 1", "Item 2", "Item 3" };         ItemSelectedCommand = new DelegateCommand<string>(OnItemSelected);     }      private void OnItemSelected(string selectedItem)     {         if (selectedItem != null)         {             _eventAggregator.GetEvent<DataUpdateEvent>().Publish(selectedItem);         }     } } 

 ListStaticView.xaml

<UserControl x:Class="YourNamespace.ListStaticView"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">     <Grid>         <TextBlock Text="{Binding UpdatedData}" />     </Grid> </UserControl> 

ListStaticViewModel.cs

using Prism.Mvvm; using Prism.Events;  public class ListStaticViewModel : BindableBase {     private readonly IEventAggregator _eventAggregator;     private string _updatedData;      public string UpdatedData     {         get { return _updatedData; }         set { SetProperty(ref _updatedData, value); }     }      public ListStaticViewModel(IEventAggregator eventAggregator)     {         _eventAggregator = eventAggregator;         _eventAggregator.GetEvent<DataUpdateEvent>().Subscribe(OnDataUpdate);     }      private void OnDataUpdate(string updatedData)     {         UpdatedData = updatedData;     } } 

4. 定义主窗口布局

MainWindow.xaml

<Window x:Class="YourNamespace.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:prism="http://prismlibrary.com/">     <Grid>         <TabControl Grid.Column="0">             <TabItem Header="患者列表" prism:RegionManager.RegionName="Tab1Region"/>             <TabItem Header="到检列表" prism:RegionManager.RegionName="Tab2Region"/>             <TabItem Header="WorkList" prism:RegionManager.RegionName="Tab3Region"/>         </TabControl>         <ContentControl Margin="300 0 0 0" prism:RegionManager.RegionName="ListStatic"/>     </Grid> </Window> 

5. 配置导航

确保在应用启动时正确导航到初始视图。

MainWindowViewModel.cs

using Prism.Mvvm; using Prism.Regions;  public class MainWindowViewModel : BindableBase {     private readonly IRegionManager _regionManager;      public MainWindowViewModel(IRegionManager regionManager)     {         _regionManager = regionManager;         _regionManager.RegisterViewWithRegion("Tab1Region", typeof(Tab1View));         _regionManager.RegisterViewWithRegion("ListStatic", typeof(ListStaticView));     } } 

第二，使用共享服务

使用共享服务可以在视图之间共享数据，并在一个视图中更新数据时通知另一个视图进行更新。

1. 定义共享服务

public interface ISharedDataService {     string SharedData { get; set; }     event Action<string> DataChanged;     void UpdateData(string data); }  public class SharedDataService : ISharedDataService {     private string _sharedData;     public string SharedData     {         get => _sharedData;         set         {             _sharedData = value;             DataChanged?.Invoke(_sharedData);         }     }      public event Action<string> DataChanged;      public void UpdateData(string data)     {         SharedData = data;     } } 

2. 注册服务

在 App.xaml.cs 中注册服务。

protected override void RegisterTypes(IContainerRegistry containerRegistry) {     containerRegistry.RegisterSingleton<ISharedDataService, SharedDataService>();     containerRegistry.RegisterForNavigation<Tab1View, Tab1ViewModel>();     containerRegistry.RegisterForNavigation<ListStaticView, ListStaticViewModel>(); } 

3. 使用共享服务

Tab1ViewModel.cs

using Prism.Commands; using Prism.Mvvm; using System.Collections.ObjectModel;  public class Tab1ViewModel : BindableBase {     private readonly ISharedDataService _sharedDataService;     private string _selectedItem;      public ObservableCollection<string> DataList { get; private set; }     public string SelectedItem     {         get { return _selectedItem; }         set { SetProperty(ref _selectedItem, value); }     }      public DelegateCommand<string> ItemSelectedCommand { get; private set; }      public Tab1ViewModel(ISharedDataService sharedDataService)     {         _sharedDataService = sharedDataService;         DataList = new ObservableCollection<string> { "Item 1", "Item 2", "Item 3" };         ItemSelectedCommand = new DelegateCommand<string>(OnItemSelected);     }      private void OnItemSelected(string selectedItem)     {         if (selectedItem != null)         {             _sharedDataService.UpdateData(selectedItem);         }     } } 

ListStaticViewModel.cs

using Prism.Mvvm;  public class ListStaticViewModel : BindableBase {     private readonly ISharedDataService _sharedDataService;     private string _updatedData;      public string UpdatedData     {         get { return _updatedData; }         set { SetProperty(ref _updatedData, value); }     }      public ListStaticViewModel(ISharedDataService sharedDataService)     {         _sharedDataService = sharedDataService;         _sharedDataService.DataChanged += OnDataChanged;     }      private void OnDataChanged(string updatedData)     {         UpdatedData = updatedData;     } } 

以上两种方法都可以实现从 Tab1Region 中的列表数据同步更新到 ListStatic 区域。