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。
