C# 一个基于.NET Core3.1的开源项目帮你彻底搞懂WPF框架Prism

--概述

这个项目演示了如何在WPF中使用各种Prism功能的示例。如果您刚刚开始使用Prism，建议您从第一个示例开始，按顺序从列表中开始。每个示例都基于前一个示例的概念。

此项目平台框架：.NET Core 3.1

Prism版本：8.0.0.1909

提示：这些项目都在同一解决方法下，需要依次打开运行，可以选中项目-》右键-》设置启动项目，然后运行：

目录介绍

Topic描述

Bootstrapper and the Shell创建一个基本的引导程序和shell

Regions创建一个区域

Custom Region Adapter为StackPanel创建自定义区域适配器

View Discovery使用视图发现自动注入视图

View Injection使用视图注入手动添加和删除视图

View Activation/Deactivation手动激活和停用视图

Modules with App.config使用应用加载模块。配置文件

Modules with Code使用代码加载模块

Modules with Directory从目录加载模块

Modules loaded manually使用IModuleManager手动加载模块

ViewModelLocator使用ViewModelLocator

ViewModelLocator - Change Convention更改ViewModelLocator命名约定

ViewModelLocator - Custom Registrations为特定视图手动注册ViewModels

DelegateCommand使用DelegateCommand和DelegateCommand<T>

CompositeCommands了解如何使用CompositeCommands作为单个命令调用多个命令

IActiveAware Commands使您的命令IActiveAware仅调用激活的命令

Event Aggregator使用IEventAggregator

Event Aggregator - Filter Events订阅事件时筛选事件

RegionContext使用RegionContext将数据传递到嵌套区域

Region Navigation请参见如何实现基本区域导航

Navigation Callback导航完成后获取通知

Navigation Participation通过INavigationAware了解视图和视图模型导航参与

Navigate to existing Views导航期间控制视图实例

Passing Parameters将参数从视图/视图模型传递到另一个视图/视图模型

Confirm/cancel Navigation使用IConfirmNavigationReqest界面确认或取消导航

Controlling View lifetime使用IRegionMemberLifetime自动从内存中删除视图

Navigation Journal了解如何使用导航日志

部分项目演示和介绍

① BootstrapperShell启动界面：

这个主要演示Prism框架搭建的用法：

step1：在nuget上引用Prsim.Unity

step2：修改App.xaml：设置引导程序

<Application x:Class="BootstrapperShell.App"             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"             xmlns:local="clr-namespace:BootstrapperShell">    <Application.Resources>             </Application.Resources></Application>

public partial class App : Application { protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e);

var bootstrapper = new Bootstrapper(); bootstrapper.Run(); } }step3：在引导程序中设置启动项目：

using Unity;using Prism.Unity;using BootstrapperShell.Views;using System.Windows;using Prism.Ioc;

namespace BootstrapperShell{ class Bootstrapper : PrismBootstrapper { protected override DependencyObject CreateShell() { return Container.Resolve<MainWindow>(); }

protected override void RegisterTypes(IContainerRegistry containerRegistry) { } }}

step4：在MainWindow.xaml中显示个字符串

<Window x:Class="BootstrapperShell.Views.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Shell" Height="350" Width="525"> <Grid> <ContentControl Content="Hello from Prism" /> </Grid></Window>

②ViewInjection：视图注册

MainWindow.xaml：通过ContentControl 关联视图

<Window x:Class="ViewInjection.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/" Title="Shell" Height="350" Width="525"> <DockPanel LastChildFill="True"> <Button DockPanel.Dock="Top" Click="Button_Click">Add View</Button> <ContentControl prism:RegionManager.RegionName="ContentRegion" /> </DockPanel></Window>

MainWindow.xaml.cs：鼠标点击后通过IRegion 接口注册视图

public partial class MainWindow : Window { IContainerExtension _container; IRegionManager _regionManager;

public MainWindow(IContainerExtension container, IRegionManager regionManager) { InitializeComponent(); _container = container; _regionManager = regionManager; }

private void Button_Click(object sender, RoutedEventArgs e) { var view = _container.Resolve<ViewA>(); IRegion region = _regionManager.Regions["ContentRegion"]; region.Add(view); } }

③ActivationDeactivation：视图激活和注销

MainWindow.xaml.cs：这里在窗体构造函数中注入了一个容器扩展接口和一个regin管理器接口，分别用来装载视图和注册regin，窗体的激活和去激活分别通过regions的Activate和Deactivate方法实现

public partial class MainWindow : Window { IContainerExtension _container; IRegionManager _regionManager; IRegion _region;

ViewA _viewA; ViewB _viewB;

public MainWindow(IContainerExtension container, IRegionManager regionManager) { InitializeComponent(); _container = container; _regionManager = regionManager;

this.Loaded += MainWindow_Loaded; }

private void MainWindow_Loaded(object sender, RoutedEventArgs e) { _viewA = _container.Resolve<ViewA>(); _viewB = _container.Resolve<ViewB>();

_region = _regionManager.Regions["ContentRegion"];

_region.Add(_viewA); _region.Add(_viewB); }

private void Button_Click(object sender, RoutedEventArgs e) { //activate view a _region.Activate(_viewA); }

private void Button_Click_1(object sender, RoutedEventArgs e) { //deactivate view a _region.Deactivate(_viewA); }

private void Button_Click_2(object sender, RoutedEventArgs e) { //activate view b _region.Activate(_viewB); }

private void Button_Click_3(object sender, RoutedEventArgs e) { //deactivate view b _region.Deactivate(_viewB); } }④UsingEventAggregator：事件发布订阅

事件类定义：

public class MessageSentEvent : PubSubEvent<string>    {    }

注册两个组件：ModuleA和ModuleB

protected override void ConfigureModuleCatalog(IModuleCatalog moduleCatalog)        {            moduleCatalog.AddModule<ModuleA.ModuleAModule>();            moduleCatalog.AddModule<ModuleB.ModuleBModule>();        }

ModuleAModule 中注册视图MessageView

public class ModuleAModule : IModule { public void OnInitialized(IContainerProvider containerProvider) { var regionManager = containerProvider.Resolve<IRegionManager>(); regionManager.RegisterViewWithRegion("LeftRegion", typeof(MessageView)); }

public void RegisterTypes(IContainerRegistry containerRegistry) { } }

MessageView.xaml：视图中给button俺妞妞绑定命令

<UserControl x:Class="ModuleA.Views.MessageView" 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" Padding="25"> <StackPanel> <TextBox Text="{Binding Message}" Margin="5"/> <Button Command="{Binding SendMessageCommand}" Content="Send Message" Margin="5"/> </StackPanel></UserControl>

MessageViewModel.cs：在vm中把界面绑定的命令委托给SendMessage，然后在方法SendMessage中发布消息：

using Prism.Commands;using Prism.Events;using Prism.Mvvm;using UsingEventAggregator.Core;

namespace ModuleA.ViewModels{ public class MessageViewModel : BindableBase { IEventAggregator _ea;

private string _message = "Message to Send"; public string Message { get { return _message; } set { SetProperty(ref _message, value); } }

public DelegateCommand SendMessageCommand { get; private set; }

public MessageViewModel(IEventAggregator ea) { _ea = ea; SendMessageCommand = new DelegateCommand(SendMessage); }

private void SendMessage() { _ea.GetEvent<MessageSentEvent>().Publish(Message); } }}

在MessageListViewModel 中接收并显示接收到的消息：

public class MessageListViewModel : BindableBase { IEventAggregator _ea;

private ObservableCollection<string> _messages; public ObservableCollection<string> Messages { get { return _messages; } set { SetProperty(ref _messages, value); } }

public MessageListViewModel(IEventAggregator ea) { _ea = ea; Messages = new ObservableCollection<string>();

_ea.GetEvent<MessageSentEvent>().Subscribe(MessageReceived); }

private void MessageReceived(string message) { Messages.Add(message); } }

以上就是这个开源项目比较经典的几个入门实例，其它就不展开讲解了，有兴趣的可以下载源码自己阅读学习。