Prism：打造WPF项目的MVVM之选，简化开发流程、提高可维护性 ...

 
概述：探索WPF开发新境界，借助Prism MVVM库，实现模块化、可维护的项目。强大的命令系统、松耦合通信、内置导航，让您的开发更高效、更流畅
在WPF开发中，一个优秀的MVVM库是Prism。以下是Prism的优点以及基本应用示例：
优点：

• 模块化设计： Prism支持模块化开发，使项目更易维护和扩展。
  
• 强大的命令系统： 提供了DelegateCommand等强大的命令实现，简化了用户交互操作的绑定。
  
• 松耦合的通信： 通过EventAggregator实现松耦合的组件间通信，提高了代码的可维护性。
  
• 内置导航系统： 提供了灵活的导航框架，支持导航到不同的视图和传递参数。
  

使用步骤：

1. 安装Prism NuGet包

在项目中执行以下命令：

1. Install-Package Prism.Wpf

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2. 创建ViewModel

1. using Prism.Mvvm;
3. public class MainViewModel : BindableBase
4. {
5.     private string _message;
7.     public string Message
8.     {
9. <Grid>
10.     <TextBlock Text="{Binding Message}" />
11.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
12. </Grid>get { return _message; }
13. <Grid>
14.     <TextBlock Text="{Binding Message}" />
15.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
16. </Grid>set { SetProperty(ref _message, value); }
17.     }
18. }

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3. 创建View

1. <Window x:
2. <Grid>
3.     <TextBlock Text="{Binding Message}" />
4.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
5. </Grid>xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
6. <Grid>
7.     <TextBlock Text="{Binding Message}" />
8.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
9. </Grid>xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
10. <Grid>
11.     <TextBlock Text="{Binding Message}" />
12.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
13. </Grid>xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
14. <Grid>
15.     <TextBlock Text="{Binding Message}" />
16.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
17. </Grid>xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
18. <Grid>
19.     <TextBlock Text="{Binding Message}" />
20.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
21. </Grid>xmlns:prism="http://prismlibrary.com/"
22. <Grid>
23.     <TextBlock Text="{Binding Message}" />
24.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
25. </Grid>prism:ViewModelLocator.AutoWireViewModel="True"
26. <Grid>
27.     <TextBlock Text="{Binding Message}" />
28.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
29. </Grid>mc:Ignorable="d"
30. <Grid>
31.     <TextBlock Text="{Binding Message}" />
32.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
33. </Grid>Title="MainWindow" Height="350" Width="525">
34.     <Grid>
35. <Grid>
36.     <TextBlock Text="{Binding Message}" />
37.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
38. </Grid><TextBlock Text="{Binding Message}" />
39.     </Grid>
40. </Window>

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4. 注册ViewModel

在App.xaml.cs中注册ViewModel：

1. using Prism.Ioc;
2. using Prism.Unity;
3. using YourNamespace.Views;
5. namespace YourNamespace
6. {
7.     public partial class App : PrismApplication
8.     {
9. <Grid>
10.     <TextBlock Text="{Binding Message}" />
11.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
12. </Grid>protected override Window CreateShell()
13. <Grid>
14.     <TextBlock Text="{Binding Message}" />
15.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
16. </Grid>{
17. <Grid>
18.     <TextBlock Text="{Binding Message}" />
19.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
20. </Grid>    return Container.Resolve<MainWindow>();
21. <Grid>
22.     <TextBlock Text="{Binding Message}" />
23.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
24. </Grid>}
26. <Grid>
27.     <TextBlock Text="{Binding Message}" />
28.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
29. </Grid>protected override void RegisterTypes(IContainerRegistry containerRegistry)
30. <Grid>
31.     <TextBlock Text="{Binding Message}" />
32.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
33. </Grid>{
34. <Grid>
35.     <TextBlock Text="{Binding Message}" />
36.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
37. </Grid>    containerRegistry.RegisterForNavigation<YourView>();
38. <Grid>
39.     <TextBlock Text="{Binding Message}" />
40.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
41. </Grid>}
42.     }
43. }

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5. 在View中使用ViewModel

1. <Grid>
2.     <TextBlock Text="{Binding Message}" />
3.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
4. </Grid>

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6. 在ViewModel中处理命令

1. using Prism.Commands;public class MainViewModel : BindableBase{    private string _message;    public string Message    {<Grid>
2.     <TextBlock Text="{Binding Message}" />
3.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
4. </Grid>get { return _message; }<Grid>
5.     <TextBlock Text="{Binding Message}" />
6.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
7. </Grid>set { SetProperty(ref _message, value); }    }    public DelegateCommand UpdateMessageCommand { get; }    public MainViewModel()    {<Grid>
8.     <TextBlock Text="{Binding Message}" />
9.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
10. </Grid>UpdateMessageCommand = new DelegateCommand(UpdateMessage);    }    private void UpdateMessage()    {<Grid>
11.     <TextBlock Text="{Binding Message}" />
12.     <Button Command="{Binding UpdateMessageCommand}" Content="Update Message" />
13. </Grid>Message = "Hello, Prism!";    }}

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以上是使用Prism的基本示例。Prism提供了更多的功能，如模块化开发、事件聚合器、导航框架等，以帮助构建结构良好、可维护的WPF应用。
 



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