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

DotNetCore实战

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2022-04-13 11:44

--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
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(); }
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 ViewButton>        <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(); 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(); _viewB = _container.Resolve();
_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:ModuleAModuleB

 protected override void ConfigureModuleCatalog(IModuleCatalog moduleCatalog)        {            moduleCatalog.AddModule();            moduleCatalog.AddModule();        }

ModuleAModule 中注册视图MessageView

 public class ModuleAModule : IModule    {        public void OnInitialized(IContainerProvider containerProvider)        {            var regionManager = containerProvider.Resolve();            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().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().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。

源码下载

github访问速度较慢,所以我下载了一份放到的百度网盘

百度网盘链接:https://pan.baidu.com/s/10Gyks2w-R4B_3z9Jj5mRcA 

提取码:0000

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开源项目链接:https://github.com/PrismLibrary/Prism-Samples-Wpf

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