回答編集履歴
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見直しキャンペーン中
answer
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申し訳ないですけど、参考サイトはだいぶひどいですね。。。
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わかっている人には何の知見も得られませんし、勉強中の方には省略部分が多すぎて参考になりません(今どきは完全版をGitHubに上げてリンクしたりするものですが)
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記事の意図のプロジェクト構成はこうです。
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`ViewModels`・`Views`フォルダ以下に、それぞれの`ViewModel`・`View`があるという前提です。
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そのフォルダ(正確には名前空間)を、xmlnsで`vm`・`view`と指定しています。
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現状フォルダ分けされていないのと、それぞれの`View`がありません(通常`UserControl`です)
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注)
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`MainWindow`も`Views`の中に入れているのかもしれませんが、名前がややこしいのであえて入れていません。
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`MainWindowViewModel`もあると思われますが、質問の本題でないので作りません。
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---
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### MainWindow
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```
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<Window
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x:Class="Questions374820.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:view="clr-namespace:Questions374820.Views"
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xmlns:vm="clr-namespace:Questions374820.ViewModels"
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Title="MainWindow"
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Width="800"
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Height="450">
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<DockPanel>
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<DockPanel.Resources>
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<DataTemplate DataType="{x:Type vm:MainViewModel}">
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<view:MainView />
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</DataTemplate>
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<DataTemplate DataType="{x:Type vm:Sub1ViewModel}">
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<view:Sub1View />
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</DataTemplate>
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<DataTemplate DataType="{x:Type vm:Sub2ViewModel}">
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<view:Sub2View />
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</DataTemplate>
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</DockPanel.Resources>
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<UniformGrid DockPanel.Dock="Top" Rows="1">
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<Button Click="Button_Click" Content="メイン" />
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<Button Click="Button_Click" Content="サブ1" />
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<Button Click="Button_Click" Content="サブ2" />
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</UniformGrid>
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<ContentControl Content="{Binding SampleViewModel}" Focusable="False" />
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</DockPanel>
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</Window>
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```
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```
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using Questions374820.ViewModels;
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namespace Questions374820
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{
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public partial class MainWindow : Window, INotifyPropertyChanged
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{
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public ViewModelBase SampleViewModel { get; set; } = new MainViewModel();
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public MainWindow()
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{
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InitializeComponent();
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DataContext = this;
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}
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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var 画面 = ((Button)sender).Content as string;
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switch (画面)
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{
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case "メイン":
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SampleViewModel = new MainViewModel();
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break;
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case "サブ1":
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SampleViewModel = new Sub1ViewModel();
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break;
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case "サブ2":
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SampleViewModel = new Sub2ViewModel();
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break;
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}
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SampleViewModel)));
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}
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public event PropertyChangedEventHandler PropertyChanged;
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}
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}
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```
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### MainView
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```
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<UserControl
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x:Class="Questions374820.Views.MainView"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<Grid>
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<TextBlock
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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FontSize="36"
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Text="MainView" />
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</Grid>
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</UserControl>
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```
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```
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using System.Windows.Controls;
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namespace Questions374820.Views
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{
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public partial class MainView : UserControl
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{
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public MainView() => InitializeComponent();
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}
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}
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```
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```
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namespace Questions374820.ViewModels
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{
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public class MainViewModel : ViewModelBase { }
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}
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```
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### Sub1View
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```
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<UserControl
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x:Class="Questions374820.Views.Sub1View"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<Grid>
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<TextBlock
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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FontSize="36"
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Text="Sub1View" />
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</Grid>
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</UserControl>
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```
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```
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using System.Windows.Controls;
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namespace Questions374820.Views
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{
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public partial class Sub1View : UserControl
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{
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public Sub1View() => InitializeComponent();
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}
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}
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```
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```
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namespace Questions374820.ViewModels
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{
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public class Sub1ViewModel : ViewModelBase { }
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}
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```
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### Sub2View
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```
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<UserControl
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x:Class="Questions374820.Views.Sub2View"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<Grid>
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<TextBlock
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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FontSize="36"
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Text="Sub2View" />
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</Grid>
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</UserControl>
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```
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```
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using System.Windows.Controls;
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namespace Questions374820.Views
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{
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public partial class Sub2View : UserControl
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{
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public Sub2View() => InitializeComponent();
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}
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}
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```
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```
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namespace Questions374820.ViewModels
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{
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public class Sub2ViewModel : ViewModelBase { }
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}
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```
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### ViewModelBase
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```
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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namespace Questions374820.ViewModels
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{
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public class ViewModelBase : INotifyPropertyChanged
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{
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public event PropertyChangedEventHandler PropertyChanged;
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protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
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{
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if (Equals(storage, value)) return false;
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storage = value;
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OnPropertyChanged(propertyName);
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return true;
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}
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protected void OnPropertyChanged(string propertyName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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1
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申し訳ないですけど、参考サイトはだいぶひどいですね。。。
|
2
|
+
わかっている人には何の知見も得られませんし、勉強中の方には省略部分が多すぎて参考になりません(今どきは完全版をGitHubに上げてリンクしたりするものですが)
|
3
|
+
|
4
|
+
記事の意図のプロジェクト構成はこうです。
|
5
|
+

|
6
|
+
|
7
|
+
`ViewModels`・`Views`フォルダ以下に、それぞれの`ViewModel`・`View`があるという前提です。
|
8
|
+
そのフォルダ(正確には名前空間)を、xmlnsで`vm`・`view`と指定しています。
|
9
|
+
|
10
|
+
現状フォルダ分けされていないのと、それぞれの`View`がありません(通常`UserControl`です)
|
11
|
+
|
12
|
+
注)
|
13
|
+
`MainWindow`も`Views`の中に入れているのかもしれませんが、名前がややこしいのであえて入れていません。
|
14
|
+
`MainWindowViewModel`もあると思われますが、質問の本題でないので作りません。
|
15
|
+
|
16
|
+
---
|
17
|
+
### MainWindow
|
18
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+
```xml
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19
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+
<Window
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20
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+
x:Class="Questions374820.MainWindow"
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21
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+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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22
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+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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23
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xmlns:view="clr-namespace:Questions374820.Views"
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24
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xmlns:vm="clr-namespace:Questions374820.ViewModels"
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25
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Title="MainWindow"
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26
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Width="800"
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27
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Height="450">
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28
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<DockPanel>
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29
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<DockPanel.Resources>
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30
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<DataTemplate DataType="{x:Type vm:MainViewModel}">
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31
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<view:MainView />
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32
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</DataTemplate>
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<DataTemplate DataType="{x:Type vm:Sub1ViewModel}">
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<view:Sub1View />
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35
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</DataTemplate>
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36
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<DataTemplate DataType="{x:Type vm:Sub2ViewModel}">
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37
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<view:Sub2View />
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38
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</DataTemplate>
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39
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</DockPanel.Resources>
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40
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+
<UniformGrid DockPanel.Dock="Top" Rows="1">
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41
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+
<Button Click="Button_Click" Content="メイン" />
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42
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+
<Button Click="Button_Click" Content="サブ1" />
|
43
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+
<Button Click="Button_Click" Content="サブ2" />
|
44
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</UniformGrid>
|
45
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+
<ContentControl Content="{Binding SampleViewModel}" Focusable="False" />
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46
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</DockPanel>
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47
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</Window>
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48
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```
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49
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+
```cs
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50
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using System.ComponentModel;
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51
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+
using System.Windows;
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52
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+
using System.Windows.Controls;
|
53
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+
using Questions374820.ViewModels;
|
54
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+
|
55
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+
namespace Questions374820
|
56
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+
{
|
57
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public partial class MainWindow : Window, INotifyPropertyChanged
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58
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+
{
|
59
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public ViewModelBase SampleViewModel { get; set; } = new MainViewModel();
|
60
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+
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61
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+
public MainWindow()
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62
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+
{
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63
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InitializeComponent();
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64
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DataContext = this;
|
65
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+
}
|
66
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+
|
67
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+
private void Button_Click(object sender, RoutedEventArgs e)
|
68
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+
{
|
69
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+
var 画面 = ((Button)sender).Content as string;
|
70
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+
switch (画面)
|
71
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+
{
|
72
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+
case "メイン":
|
73
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+
SampleViewModel = new MainViewModel();
|
74
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+
break;
|
75
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+
case "サブ1":
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76
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SampleViewModel = new Sub1ViewModel();
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77
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break;
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78
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case "サブ2":
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79
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SampleViewModel = new Sub2ViewModel();
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80
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break;
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81
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+
}
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82
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+
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83
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SampleViewModel)));
|
84
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+
}
|
85
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+
|
86
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public event PropertyChangedEventHandler PropertyChanged;
|
87
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+
}
|
88
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+
}
|
89
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+
```
|
90
|
+
|
91
|
+
### MainView
|
92
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+
```xml
|
93
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+
<UserControl
|
94
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+
x:Class="Questions374820.Views.MainView"
|
95
|
+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
96
|
+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
|
97
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+
<Grid>
|
98
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+
<TextBlock
|
99
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+
HorizontalAlignment="Center"
|
100
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+
VerticalAlignment="Center"
|
101
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+
FontSize="36"
|
102
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+
Text="MainView" />
|
103
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+
</Grid>
|
104
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+
</UserControl>
|
105
|
+
```
|
106
|
+
```cs
|
107
|
+
using System.Windows.Controls;
|
108
|
+
|
109
|
+
namespace Questions374820.Views
|
110
|
+
{
|
111
|
+
public partial class MainView : UserControl
|
112
|
+
{
|
113
|
+
public MainView() => InitializeComponent();
|
114
|
+
}
|
115
|
+
}
|
116
|
+
```
|
117
|
+
```cs
|
118
|
+
namespace Questions374820.ViewModels
|
119
|
+
{
|
120
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+
public class MainViewModel : ViewModelBase { }
|
121
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+
}
|
122
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+
```
|
123
|
+
|
124
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+
### Sub1View
|
125
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+
```xml
|
126
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+
<UserControl
|
127
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+
x:Class="Questions374820.Views.Sub1View"
|
128
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+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
129
|
+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
|
130
|
+
<Grid>
|
131
|
+
<TextBlock
|
132
|
+
HorizontalAlignment="Center"
|
133
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+
VerticalAlignment="Center"
|
134
|
+
FontSize="36"
|
135
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+
Text="Sub1View" />
|
136
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+
</Grid>
|
137
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+
</UserControl>
|
138
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+
```
|
139
|
+
```cs
|
140
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+
using System.Windows.Controls;
|
141
|
+
|
142
|
+
namespace Questions374820.Views
|
143
|
+
{
|
144
|
+
public partial class Sub1View : UserControl
|
145
|
+
{
|
146
|
+
public Sub1View() => InitializeComponent();
|
147
|
+
}
|
148
|
+
}
|
149
|
+
```
|
150
|
+
```cs
|
151
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+
namespace Questions374820.ViewModels
|
152
|
+
{
|
153
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+
public class Sub1ViewModel : ViewModelBase { }
|
154
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+
}
|
155
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+
```
|
156
|
+
|
157
|
+
### Sub2View
|
158
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+
```xml
|
159
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+
<UserControl
|
160
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+
x:Class="Questions374820.Views.Sub2View"
|
161
|
+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
162
|
+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
|
163
|
+
<Grid>
|
164
|
+
<TextBlock
|
165
|
+
HorizontalAlignment="Center"
|
166
|
+
VerticalAlignment="Center"
|
167
|
+
FontSize="36"
|
168
|
+
Text="Sub2View" />
|
169
|
+
</Grid>
|
170
|
+
</UserControl>
|
171
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+
```
|
172
|
+
```cs
|
173
|
+
using System.Windows.Controls;
|
174
|
+
|
175
|
+
namespace Questions374820.Views
|
176
|
+
{
|
177
|
+
public partial class Sub2View : UserControl
|
178
|
+
{
|
179
|
+
public Sub2View() => InitializeComponent();
|
180
|
+
}
|
181
|
+
}
|
182
|
+
```
|
183
|
+
```cs
|
184
|
+
namespace Questions374820.ViewModels
|
185
|
+
{
|
186
|
+
public class Sub2ViewModel : ViewModelBase { }
|
187
|
+
}
|
188
|
+
```
|
189
|
+
|
190
|
+
### ViewModelBase
|
191
|
+
```cs
|
192
|
+
using System.ComponentModel;
|
193
|
+
using System.Runtime.CompilerServices;
|
194
|
+
|
195
|
+
namespace Questions374820.ViewModels
|
196
|
+
{
|
197
|
+
public class ViewModelBase : INotifyPropertyChanged
|
198
|
+
{
|
199
|
+
public event PropertyChangedEventHandler PropertyChanged;
|
200
|
+
protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
|
201
|
+
{
|
202
|
+
if (Equals(storage, value)) return false;
|
203
|
+
storage = value;
|
204
|
+
OnPropertyChanged(propertyName);
|
205
|
+
return true;
|
206
|
+
}
|
207
|
+
protected void OnPropertyChanged(string propertyName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
|
208
|
+
}
|
209
|
+
}
|
210
210
|
```
|