C#-Wpf-Prism.DryIoc-【5】事件聚合器
作者:互联网
【1】先完成基本的环境搭建,可参考C#-WPF-Prism.DryIoc-【1】环境搭建 - 轻吟浅唱,蓦然花开 - 博客园 (cnblogs.com)
【2】事件聚合器可用于跨ViewModel的消息传递,所以我们需要先定义一个消息实体Message.cs(根据自己的需要写)放到项目的Events文件夹下,并创建一个MessageEvent继承于泛型类PubSubEvent。代码如下
namespace Wpf_Prism.DryIoc_EventAggregator.Events { public class Message { public long Id { get; set; } public string Content { get; set; } } }
using Prism.Events; namespace Wpf_Prism.DryIoc_EventAggregator.Events { public class MessageEvent:PubSubEvent<Message> { } }
【3】本项目结构如下图,再Views文件夹中建立了View1和View2两个用户控件和一个窗体MainView,而ViewModels下也分别建立了对应的ViewModel
【4】编辑MainView.xaml 在上面放了三个按钮并绑定了命令和参数,用来切换页面和推送消息
<Window x:Class="Wpf_Prism.DryIoc_EventAggregator.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:prism="http://prismlibrary.com/" xmlns:local="clr-namespace:Wpf_Prism.DryIoc_EventAggregator.Views" prism:ViewModelLocator.AutoWireViewModel="True" mc:Ignorable="d" Title="MainView" Height="450" Width="800"> <DockPanel> <UniformGrid Columns="3" DockPanel.Dock="Top"> <Button Content="打开View1" Command="{Binding OpenViewCommand}" CommandParameter="View1"/> <Button Content="打开View2" Command="{Binding OpenViewCommand}" CommandParameter="View2"/> <Button Content="发送消息" Command="{Binding SendMessageCommand}"/> </UniformGrid> <ContentControl prism:RegionManager.RegionName="MainContentRegion"/> </DockPanel> </Window>
【5】编辑MainViewModel.cs 添加对应的命令,以及注入需要使用的IRegionManager 和 IEventAggregator接口
using Prism.Commands; using Prism.Events; using Prism.Regions; using Wpf_Prism.DryIoc_EventAggregator.Events; namespace Wpf_Prism.DryIoc_EventAggregator.ViewModels { public class MainViewModel { private readonly IRegionManager regionManager; private readonly IEventAggregator eventAggregator; public DelegateCommand<string> OpenViewCommand { get;private set; } public DelegateCommand SendMessageCommand { get;private set; } public MainViewModel(IRegionManager regionManager,IEventAggregator eventAggregator) { this.regionManager = regionManager; this.eventAggregator = eventAggregator; OpenViewCommand = new DelegateCommand<string>(OpenView); SendMessageCommand = new DelegateCommand(SendMessage); } /// <summary> /// 发送消息 Hello /// </summary> private void SendMessage()=> eventAggregator.GetEvent<MessageEvent>().Publish(new Message { Content = "Hello" }); /// <summary> /// 导航 /// </summary> /// <param name="obj"></param> private void OpenView(string obj) => regionManager.Regions["MainContentRegion"].RequestNavigate(obj); } }
【6】编辑View1ViewModel 和View2ViewModel代码如下
using Prism.Events; using System.Windows; using Wpf_Prism.DryIoc_EventAggregator.Events; namespace Wpf_Prism.DryIoc_EventAggregator.ViewModels { public class View1ViewModel { private readonly IEventAggregator eventAggregator; public View1ViewModel(IEventAggregator eventAggregator) { this.eventAggregator = eventAggregator; //订阅 eventAggregator.GetEvent<MessageEvent>().Subscribe(ReceivedMessage); } /// <summary> /// 接收到消息 /// </summary> /// <param name="obj"></param> private void ReceivedMessage(Message obj) => MessageBox.Show("View1收到消息:" + obj.Content); } }
using Prism.Events; using System.Windows; using Wpf_Prism.DryIoc_EventAggregator.Events; namespace Wpf_Prism.DryIoc_EventAggregator.ViewModels { public class View2ViewModel { private readonly IEventAggregator eventAggregator; public View2ViewModel(IEventAggregator eventAggregator) { this.eventAggregator = eventAggregator; eventAggregator.GetEvent<MessageEvent>().Subscribe(ReceivedMessage); } private void ReceivedMessage(Message obj) { MessageBox.Show("View2收到消息:" + obj.Content+"\r\n后续不会收到消息"); //取消订阅 eventAggregator.GetEvent<MessageEvent>().Unsubscribe(ReceivedMessage); } } }
【7】在app.xaml.cs中将View1,View1ViewModel 和View2 ,View2ViewModel注册到容器
using Prism.Ioc; using System; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Linq; using System.Windows; using Wpf_Prism.DryIoc_EventAggregator.ViewModels; using Wpf_Prism.DryIoc_EventAggregator.Views; namespace Wpf_Prism.DryIoc_EventAggregator { /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App { protected override Window CreateShell() { return Container.Resolve<MainView>(); } protected override void RegisterTypes(IContainerRegistry containerRegistry) { containerRegistry.RegisterForNavigation<View1, View1ViewModel>(); containerRegistry.RegisterForNavigation<View2, View2ViewModel>(); } } }
【8】运行项目,效果如下:
完成,谢谢!
标签:eventAggregator,C#,DryIoc,Prism,using,Wpf,public 来源: https://www.cnblogs.com/nickyangmiracle/p/16170080.html