MVVM_UI和逻辑分离（事件利用命令替换），命令代替事件，命令传递事件参数，附完整demo

近期公司重构了些界面，因为换肤和界面定制的缘故，需要把样式和逻辑分开；所以记录下关键的操作；主要是利用命令代替事件，利用命令传递事件的参数...

先大致看下效果：

主要是利用 Prism 库，可直接利用 nuget 添加

下面是详细代码：

 1 <Window x:Class="Demo_MVVM.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6         xmlns:local="clr-namespace:Demo_MVVM"
 7         xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
 8         xmlns:prism="http://www.codeplex.com/prism"
 9         mc:Ignorable="d"
10         Title="MainWindow"
11         WindowStartupLocation="CenterScreen"
12         Height="350"
13         Width="400"
14         DataContext="{DynamicResource vm}"
15         >
16     <Window.Resources>
17         <local:ReverseBool x:Key="ReverseBool" />
18
19         <DataTemplate x:Key="Template1">
20             <TextBlock Text="{Binding IsTemplate1,StringFormat=我是模板1：{0}}"/>
21         </DataTemplate>
22
23         <DataTemplate x:Key="Template2">
24             <TextBlock Text="{Binding IsTemplate1,StringFormat=我是模板2：{0}}"/>
25         </DataTemplate>
26
27         <local:MainWindowViewModel x:Key="vm"/>
28     </Window.Resources>
29     <Grid>
30         <StackPanel>
31             <TextBlock Text="采用mvvm，UI和逻辑分离" />
32             <StackPanel Orientation="Horizontal">
33                 <RadioButton Content="模板1" IsChecked="{Binding IsTemplate1}" GroupName="mb" />
34                 <RadioButton Content="模板2" IsChecked="{Binding IsTemplate1,Converter={StaticResource ReverseBool}}" GroupName="mb" />
35             </StackPanel>
36             <ContentControl Content="{Binding}">
37                 <ContentControl.Style>
38                     <Style TargetType="ContentControl">
39                         <Setter Property="ContentTemplate" Value="{StaticResource Template1}" />
40                         <Style.Triggers>
41                             <DataTrigger Binding="{Binding IsTemplate1}" Value="false">
42                                 <Setter Property="ContentTemplate" Value="{StaticResource Template2}" />
43                             </DataTrigger>
44                         </Style.Triggers>
45                     </Style>
46                 </ContentControl.Style>
47             </ContentControl>
48
49             <TextBox Text="这里面实现了鼠标滚动获取滚动向量" Height="100" >
50                 <i:Interaction.Triggers>
51                     <i:EventTrigger EventName="PreviewMouseWheel">
52                         <prism:InvokeCommandAction Command="{Binding MouseWheelCommand}"/>
53                     </i:EventTrigger>
54                 </i:Interaction.Triggers>
55             </TextBox>
56         </StackPanel>
57         <i:Interaction.Triggers>
58             <i:EventTrigger EventName="Loaded">
59                 <prism:InvokeCommandAction Command="{Binding InitCommand}"/>
60             </i:EventTrigger>
61         </i:Interaction.Triggers>
62     </Grid>
63 </Window>

 1 using Prism.Commands;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.ComponentModel;
 5 using System.Linq;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 using System.Windows;
 9 using System.Windows.Input;
10
11 namespace Demo_MVVM
12 {
13     class MainWindowViewModel : INotifyPropertyChanged
14     {
15         private bool isTemplate1 = true;
16
17         public event PropertyChangedEventHandler PropertyChanged;
18
19         public ICommand InitCommand { get; private set; }
20         public DelegateCommand<object> MouseWheelCommand { get; set; }
21
22         public bool IsTemplate1
23         {
24             get => isTemplate1;
25             set
26             {
27                 isTemplate1 = value;
28                 PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsTemplate1)));
29             }
30         }
31
32
33         public MainWindowViewModel()
34         {
35             InitCommand = new DelegateCommand(Init);
36             MouseWheelCommand = new DelegateCommand<object>(MouseWheel);
37         }
38
39         void Init()
40         {
41             MessageBox.Show("初始化完成！");
42         }
43
44         void MouseWheel(object obj)
45         {
46             if (obj is MouseWheelEventArgs eventArgs)
47             {
48                 MessageBox.Show("滚动了：" + eventArgs.Delta);
49             }
50         }
51     }
52 }

有需要完整demo的，包含所需要的库，请移步下载