WPF Prism的ViewModelLoctor对象个性化匹配、IOC、事件聚合器

xiangtingsl · 发表于 2022-3-7 15:33

Prism的ViewModelLoctor对象个性化匹配、IOC、事件聚合器

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更改命名约定

最终返回一个ViewModel的类型

新建文件夹/窗口【ViewTest/MainWindow.xaml】，代码如下：
<Window x:Class="WpfApp6.ViewTest.MainWindow" 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:local="clr-namespace:WpfApp6.ViewTest" xmlns:prism="http://prismlibrary.com/" prism:ViewModelLocator.AutoWireViewModel="true" mc:Ignorable="d" Title="MainWindow" Height="450" Width="800"> <Grid> <StackPanel> <TextBlock Text="您好"></TextBlock> <TextBlock Text="{Binding Value}"></TextBlock> </StackPanel> </Grid></Window> 新建文件夹/类【ViewModelTest/MainViewModel】，代码如下：using Prism.Mvvm;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace WpfApp6.ViewModelTest{ public class MainViewModel:BindableBase { private string _value = "Hellow Word"; public string Value { get { return _value; } set { SetProperty(ref _value, value); } } }}
App.xaml.cs 代码新增重写方法：【ConfigureViewModelLocator】来配置个性化规则
using Prism.Ioc;using Prism.Mvvm;using Prism.Unity;using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Linq;using System.Threading.Tasks;using System.Windows;namespace WpfApp6{ /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : PrismApplication { protected override Window CreateShell() { return Container.Resolve<ViewTest.MainWindow>(); } protected override void RegisterTypes(IContainerRegistry containerRegistry) { } /// <summary> /// 配置ViewModelLocator的匹配规则 /// </summary> protected override void ConfigureViewModelLocator() { ViewModelLocationProvider.SetDefaultViewTypeToViewModelTypeResolver((t) => { //参数 t:需要匹配的视图 //返回需要匹配的ViewModel的类型 var viewName = t.FullName; var vmName = viewName.Replace(".ViewTest.", ".ViewModelTest."); if (vmName.EndsWith("Window")) vmName = vmName.Substring(0, vmName.Length - 6); if (vmName.EndsWith("View")) vmName += "Model"; else vmName += "ViewModel"; return Type.GetType(vmName); }); } }}

独立注册--4种方式

临时注册某一个关系对象

新建文件夹：【ViewTest/DemoWin.xaml】，实例代码如下：
<Window x:Class="WpfApp6.ViewTest.DemoWin" 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/" prism:ViewModelLocator.AutoWireViewModel="True" xmlns:local="clr-namespace:WpfApp6.ViewTest" mc:Ignorable="d" Title="DemoWin" Height="450" Width="800"> <Grid> <TextBlock Text="{Binding Value}"></TextBlock> </Grid></Window>
新建文件夹：【ViewModelTest/DemoViewModel.cs】，代码如下：
using Prism.Ioc;using Prism.Mvvm;using Prism.Unity;using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Linq;using System.Threading.Tasks;using System.Windows;namespace WpfApp6{ /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : PrismApplication { protected override Window CreateShell() { return Container.Resolve<ViewTest.DemoWin>(); } protected override void RegisterTypes(IContainerRegistry containerRegistry) { } /// <summary> /// 配置ViewModelLocator的匹配规则 /// </summary> protected override void ConfigureViewModelLocator() { //临时注册某一个关系对象 //1 类型对接类型 ViewModelLocationProvider.Register(typeof(ViewTest.DemoWin).ToString(),typeof(ViewModelTest.DemoViewModel)); } }}
类型对接工厂
protected override void ConfigureViewModelLocator() { //2 类型对接工厂 ViewModelLocationProvider.Register(typeof(ViewTest.DemoWin).ToString(),()=> { return Container.Resolve<ViewModelTest.DemoViewModel>(); }); }
通用工厂

泛型类型
/// <summary> /// 配置ViewModelLocator的匹配规则 /// </summary> protected override void ConfigureViewModelLocator() { //4 泛型类型 ViewModelLocationProvider.Register<ViewTest.DemoWin,ViewModelTest.DemoViewModel>(); }

IOC思想的应用与业务逻辑

Prism.Unity框架中自带了类对象注册的方法，在App.xaml.cs中的  RegisterTypes 方法，实例代码如下：
      /// <summary>       /// IOC容器对象的注册       /// </summary>       /// <param name="containerRegistry"></param>       protected override void RegisterTypes(IContainerRegistry containerRegistry)       {          containerRegistry.Register<IDataAccess, DataAccess>();       }
新建接口类与实现类，代码如下：
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace WpfApp6.DAL{ public class DataAccess : IDataAccess {             public string GetData()       {          return "世界和平！";       } }}using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace WpfApp6.DAL{  public  interface IDataAccess {       string GetData(); }}
DemoViewModel代码如下：
using Prism.Mvvm;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using WpfApp6.DAL;namespace WpfApp6.ViewModelTest{ public class DemoViewModel : BindableBase {          private string _value="世界和平！";       public string Value       {          get { return _value; }          set          {             SetProperty(ref _value, value);          }       }       //  构造函数注入    // public DemoViewModel(IDataAccess _data)    //  {       //  this.Value =  _data.GetData();    //  }    //属性注入    [Dependency]    private IDataAccess _data{get;set;} }}事件聚合器【发布  订阅】
- 代码实现如下
  
  MainWindowViewModel类
  using Prism.Commands;using Prism.Events;using Prism.Mvvm;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Input;using WpfApp7.Dal;using WpfApp7.Events;namespace WpfApp7.ViewModels{ public class MainWindowViewModel : BindableBase {       private string _value = "世界和平！";       private readonly IEventAggregator eventAgs;       public string Value       {          get { return _value; }          set          {             SetProperty(ref _value, value);          }       }       public MainWindowViewModel(IDataAccess da, IEventAggregator _eventAgs)       {          //订阅一个事件          eventAgs = _eventAgs;          eventAgs.GetEvent<MessageEvent>().Subscribe((o) => {             this.Value = o.ToString();          });       }       /// <summary>       /// 生产者  发布事件       /// </summary>       public ICommand Btn_Send       {          get => new DelegateCommand<object>((p) =>          {             eventAgs.GetEvent<MessageEvent>().Publish(p);          });       } }}//备注： //Subscribe  参数    //第一个参数为：订阅者的执行Action    //第二个参数为：ThreadOption  订阅者使用哪个线程来处理事件。                //是个枚举                   //.PublisherThread  发布者的执行线程默认                //.BackgroundThread  不管在哪个线程发布  这里的Action都在后台线程处理                //.UIThread 不管在哪个线程发布这里的Action都在UI线程处理    //第三个参数是个bool类型  是个开关  默认为 false    //第四个参数  Predicate<TPayload> filter  过滤器
  新建事件类：Events/MessageEvent  并继承  PubSubEvent<object>  object是为传递的参数
  using Prism.Events;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace WpfApp7.Events{ /// <summary> /// 定义一个事件类 /// </summary> public class MessageEvent:PubSubEvent<object> { }}
  MainWindow.xaml 代码如下：
  <Window x:Class="WpfApp7.Views.MainWindow"       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:local="clr-namespace:WpfApp7.Views"       xmlns:prism="http://prismlibrary.com/"       prism:ViewModelLocator.AutoWireViewModel="True"       mc:Ignorable="d"       Title="MainWindow" Height="450" Width="800"> <Grid>       <StackPanel>          <Button Content="生产者" Command="{Binding Btn_Send}" CommandParameter="123"></Button>          <TextBlock Text="{Binding Value}" ></TextBlock>       </StackPanel> </Grid></Window>

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