C# 一個基於.NET Core3.1的開源項目幫你徹底搞懂WPF框架Prism

--概述

這個項目演示了如何在WPF中使用各種Prism功能的示例。如果您剛剛開始使用Prism，建議您從第一個示例開始，按順序從列表中開始。每個示例都基於前一個示例的概念。

此項目平台框架：.NET Core 3.1

Prism版本：8.0.0.1909

提示：這些項目都在同一解決方法下，需要依次打開運行，可以選中項目-》右鍵-》設置啟動項目，然后運行：

 

 

 

目錄介紹

Topic	描述
Bootstrapper and the Shell	創建一個基本的引導程序和shell
Regions	創建一個區域
Custom Region Adapter	為StackPanel創建自定義區域適配器
View Discovery	使用視圖發現自動注入視圖
View Injection	使用視圖注入手動添加和刪除視圖
View Activation/Deactivation	手動激活和停用視圖
Modules with App.config	使用應用加載模塊。配置文件
Modules with Code	使用代碼加載模塊
Modules with Directory	從目錄加載模塊
Modules loaded manually	使用IModuleManager手動加載模塊
ViewModelLocator	使用ViewModelLocator
ViewModelLocator - Change Convention	更改ViewModelLocator命名約定
ViewModelLocator - Custom Registrations	為特定視圖手動注冊ViewModels
DelegateCommand	使用DelegateCommand和DelegateCommand<T>
CompositeCommands	了解如何使用CompositeCommands作為單個命令調用多個命令
IActiveAware Commands	使您的命令IActiveAware僅調用激活的命令
Event Aggregator	使用IEventAggregator
Event Aggregator - Filter Events	訂閱事件時篩選事件
RegionContext	使用RegionContext將數據傳遞到嵌套區域
Region Navigation	請參見如何實現基本區域導航
Navigation Callback	導航完成后獲取通知
Navigation Participation	通過INavigationAware了解視圖和視圖模型導航參與
Navigate to existing Views	導航期間控制視圖實例
Passing Parameters	將參數從視圖/視圖模型傳遞到另一個視圖/視圖模型
Confirm/cancel Navigation	使用IConfirmNavigationReqest界面確認或取消導航
Controlling View lifetime	使用IRegionMemberLifetime自動從內存中刪除視圖
Navigation Journal	了解如何使用導航日志

部分項目演示和介紹

① BootstrapperShell啟動界面：

 

 

 

這個主要演示Prism框架搭建的用法：

step1：在nuget上引用Prsim.Unity

step2：修改App.xaml：設置引導程序

<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：在引導程序中設置啟動項目：

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中顯示個字符串

<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：視圖注冊

MainWindow.xaml：通過ContentControl 關聯視圖

<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：鼠標點擊后通過IRegion 接口注冊視圖

 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：視圖激活和注銷

MainWindow.xaml.cs：這里在窗體構造函數中注入了一個容器擴展接口和一個regin管理器接口，分別用來裝載視圖和注冊regin，窗體的激活和去激活分別通過regions的Activate和Deactivate方法實現

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：事件發布訂閱

事件類定義：

public class MessageSentEvent : PubSubEvent<string>
    {
    }

　　注冊兩個組件：ModuleA和ModuleB

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

　　ModuleAModule 中注冊視圖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：視圖中給button俺妞妞綁定命令

<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中把界面綁定的命令委托給SendMessage，然后在方法SendMessage中發布消息：

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 中接收並顯示接收到的消息：

 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);
        }
    }

　　

以上就是這個開源項目比較經典的幾個入門實例，其它就不展開講解了，有興趣的可以下載源碼自己閱讀學習。

源碼下載

github訪問速度較慢，所以我下載了一份放到的百度網盤

百度網盤鏈接：https://pan.baidu.com/s/10Gyks2w-R4B_3z9Jj5mRcA 

提取碼：0000

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開源項目鏈接：https://github.com/PrismLibrary/Prism-Samples-Wpf

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