回答編集履歴
4
見直しキャンペーン中
answer
CHANGED
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> ボタンクリックで動的に作成したタブの中に、別に作成した子画面の内容を表示させたい。
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方法はいろいろあります。私ならこうするかな?という案です。
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それぞれ独立性の高い子画面なら、`DataTemplate`でビューを切り替えるのがいいと思います。
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> TabControlの表示/非表示を切り替えたい
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まあどちらでもいいんですが、`Image`の`Visibility`を`bool`で切り替えてみました。
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```
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<Window
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x:Class="Questions309980.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:local="clr-namespace:Questions309980"
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Title="MainWindow"
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Width="800"
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Height="450">
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<Window.DataContext>
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<local:MainViewModel />
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</Window.DataContext>
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<Window.Resources>
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<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
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<Style TargetType="{x:Type Button}">
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<Setter Property="Margin" Value="5" />
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<Setter Property="MinWidth" Value="80" />
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</Style>
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-
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<!-- DataTemplateでタブのコンテントを切り替える -->
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<!-- UserControlを作ってもいいし -->
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<DataTemplate DataType="{x:Type local:ToDoViewModel}">
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<local:ToDoView />
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</DataTemplate>
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<!-- 簡単な内容ならこの場で作ってもいい -->
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<DataTemplate DataType="{x:Type local:CalendarViewModel}">
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<DockPanel>
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<TextBlock
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DockPanel.Dock="Top"
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FontSize="24"
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FontWeight="Bold"
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Text="Calendar" />
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<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
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<Button Command="{Binding HogeCommand}" Content="Hoge" />
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</StackPanel>
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<Calendar HorizontalAlignment="Left" VerticalAlignment="Top" SelectedDate="{Binding SelectedDate}" />
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</DockPanel>
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</DataTemplate>
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</Window.Resources>
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<DockPanel>
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<TextBlock Text="{Binding StatusMessage}" HorizontalAlignment="Right" DockPanel.Dock="Bottom" />
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<GroupBox Background="Papayawhip">
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<StackPanel>
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<Button Command="{Binding Command}" CommandParameter="{x:Type local:ToDoViewModel}" Content="ToDo" />
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<Button Command="{Binding Command}" CommandParameter="{x:Type local:CalendarViewModel}" Content="Calendar" />
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</StackPanel>
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</GroupBox>
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<Grid>
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<TabControl ItemsSource="{Binding TabItems}" SelectedItem="{Binding SelectedItem}">
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<TabControl.ItemTemplate>
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<DataTemplate>
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<TextBlock Text="{Binding TabHeader}" />
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</DataTemplate>
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</TabControl.ItemTemplate>
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</TabControl>
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<!-- はじめは上に重なってTabControlを隠している -->
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<Image
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HorizontalAlignment="Left"
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VerticalAlignment="Top"
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Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg"
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Visibility="{Binding IsImageVisible, Converter={StaticResource BooleanToVisibilityConverter}}" />
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</Grid>
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</DockPanel>
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</Window>
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```
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```
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<UserControl
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x:Class="Questions309980.ToDoView"
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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:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:local="clr-namespace:Questions309980"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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d:DesignHeight="450"
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d:DesignWidth="800"
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mc:Ignorable="d">
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<DockPanel>
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<TextBlock
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DockPanel.Dock="Top"
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FontSize="24"
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FontWeight="Bold"
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Text="ToDo" />
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<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
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<Button Command="{Binding AddCommand}" Content="Add" />
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<Button Command="{Binding DelCommand}" Content="Del" />
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<Button Command="{Binding DoneCommand}" Content="Done" />
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</StackPanel>
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<ListBox>
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<ListBoxItem Content="aaa" />
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<ListBoxItem Content="bbb" />
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<ListBoxItem Content="ccc" />
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</ListBox>
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</DockPanel>
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</UserControl>
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```
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```
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using Prism.Commands;
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using Prism.Mvvm;
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using System;
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using System.Collections.ObjectModel;
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using System.Diagnostics;
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using System.Linq;
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namespace Questions309980
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{
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public class MainViewModel : BindableBase
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{
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private bool _IsImageVisible = true;
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public bool IsImageVisible { get => _IsImageVisible; set => SetProperty(ref _IsImageVisible, value); }
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private TabItemBase _SelectedItem;
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public TabItemBase SelectedItem { get => _SelectedItem; set => SetProperty(ref _SelectedItem, value); }
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private string _StatusMessage;
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public string StatusMessage { get => _StatusMessage; set => SetProperty(ref _StatusMessage, value); }
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public ObservableCollection<TabItemBase> TabItems { get; } = new();
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public DelegateCommand<Type> Command { get; }
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public MainViewModel()
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{
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Command = new(type =>
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{
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// ImageのVisibilityを切り替える
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IsImageVisible = false;
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// switch文等で作り分けてもいいが、面倒なので型(Type)から直で生成
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var item = (TabItemBase)Activator.CreateInstance(type);
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// item追加
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TabItems.Add(item);
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// item選択
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SelectedItem = item;
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// CanExecuteを再確認させる
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Command.RaiseCanExecuteChanged();
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StatusMessage = $"{type.Name} 読み込み";
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},
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// 同じボタンは2回押せないようにする(TabItemsにすでに同じ型があるかどうか)
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type => !TabItems.Any(x => x.GetType().Equals(type)));
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}
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}
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public abstract class TabItemBase : BindableBase
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{
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public string TabHeader { get; }
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public TabItemBase(string header) => TabHeader = header;
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}
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public class ToDoViewModel : TabItemBase
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{
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public DelegateCommand AddCommand { get; }
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public DelegateCommand DelCommand { get; }
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public DelegateCommand DoneCommand { get; }
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public ToDoViewModel() : base("ToDo")
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{
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AddCommand = new(() => Debug.WriteLine("AddCommand"));
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DelCommand = new(() => Debug.WriteLine("DelCommand"));
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DoneCommand = new(() => Debug.WriteLine("DoneCommand"));
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}
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}
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public class CalendarViewModel : TabItemBase
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{
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private DateTime _SelectedDate;
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public DateTime SelectedDate { get => _SelectedDate; set => SetProperty(ref _SelectedDate, value); }
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public DelegateCommand HogeCommand { get; }
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public CalendarViewModel() : base("Calendar") => HogeCommand = new(() => Debug.WriteLine(SelectedDate));
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}
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}
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```
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`BindableBase`・`DelegateCommand`は、`Prism.Core`を使用しました。
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[NuGet Gallery | Prism.Core 8.0.0.1909](https://www.nuget.org/packages/Prism.Core/)
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特に指定がないので
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[Target-typed new expressions - C# 9.0 specification proposals | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/csharp/language-reference/proposals/csharp-9.0/target-typed-new)
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[ターゲットからの new 型推論 | ++C++; // 未確認飛行 C](https://ufcpp.net/study/csharp/oo_construct.html#target-typed-new)
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---
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[[Q&A] WPF MVVMの学習 - Qiita](https://qiita.com/choni-k/questions/8973d506bcca4722ce2c)
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> teratailでは、マルチポスト※の推奨はしていません。
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[ヘルプ|teratail(テラテイル)](https://teratail.com/help#posted-otherservice)
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1
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> ボタンクリックで動的に作成したタブの中に、別に作成した子画面の内容を表示させたい。
|
2
|
+
|
3
|
+
方法はいろいろあります。私ならこうするかな?という案です。
|
4
|
+
それぞれ独立性の高い子画面なら、`DataTemplate`でビューを切り替えるのがいいと思います。
|
5
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+
|
6
|
+
|
7
|
+
> TabControlの表示/非表示を切り替えたい
|
8
|
+
|
9
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+
まあどちらでもいいんですが、`Image`の`Visibility`を`bool`で切り替えてみました。
|
10
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+
|
11
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+
|
12
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```xml
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<Window
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x:Class="Questions309980.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:local="clr-namespace:Questions309980"
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Title="MainWindow"
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Width="800"
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Height="450">
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<Window.DataContext>
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<local:MainViewModel />
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</Window.DataContext>
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<Window.Resources>
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<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
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<Style TargetType="{x:Type Button}">
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<Setter Property="Margin" Value="5" />
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<Setter Property="MinWidth" Value="80" />
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</Style>
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+
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<!-- DataTemplateでタブのコンテントを切り替える -->
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<!-- UserControlを作ってもいいし -->
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<DataTemplate DataType="{x:Type local:ToDoViewModel}">
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<local:ToDoView />
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</DataTemplate>
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+
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<!-- 簡単な内容ならこの場で作ってもいい -->
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<DataTemplate DataType="{x:Type local:CalendarViewModel}">
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<DockPanel>
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40
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<TextBlock
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DockPanel.Dock="Top"
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FontSize="24"
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FontWeight="Bold"
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Text="Calendar" />
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<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
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<Button Command="{Binding HogeCommand}" Content="Hoge" />
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</StackPanel>
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<Calendar HorizontalAlignment="Left" VerticalAlignment="Top" SelectedDate="{Binding SelectedDate}" />
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</DockPanel>
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</DataTemplate>
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</Window.Resources>
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<DockPanel>
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<TextBlock Text="{Binding StatusMessage}" HorizontalAlignment="Right" DockPanel.Dock="Bottom" />
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55
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<GroupBox Background="Papayawhip">
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<StackPanel>
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<Button Command="{Binding Command}" CommandParameter="{x:Type local:ToDoViewModel}" Content="ToDo" />
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<Button Command="{Binding Command}" CommandParameter="{x:Type local:CalendarViewModel}" Content="Calendar" />
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</StackPanel>
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</GroupBox>
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<Grid>
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<TabControl ItemsSource="{Binding TabItems}" SelectedItem="{Binding SelectedItem}">
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<TabControl.ItemTemplate>
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<DataTemplate>
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<TextBlock Text="{Binding TabHeader}" />
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</DataTemplate>
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</TabControl.ItemTemplate>
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</TabControl>
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<!-- はじめは上に重なってTabControlを隠している -->
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<Image
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HorizontalAlignment="Left"
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VerticalAlignment="Top"
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Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg"
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Visibility="{Binding IsImageVisible, Converter={StaticResource BooleanToVisibilityConverter}}" />
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</Grid>
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</DockPanel>
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80
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</Window>
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81
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+
```
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83
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+
```xml
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84
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<UserControl
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x:Class="Questions309980.ToDoView"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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87
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+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
|
88
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+
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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89
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+
xmlns:local="clr-namespace:Questions309980"
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90
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+
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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d:DesignHeight="450"
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92
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d:DesignWidth="800"
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mc:Ignorable="d">
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<DockPanel>
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95
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<TextBlock
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96
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DockPanel.Dock="Top"
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97
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FontSize="24"
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98
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FontWeight="Bold"
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Text="ToDo" />
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<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
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<Button Command="{Binding AddCommand}" Content="Add" />
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<Button Command="{Binding DelCommand}" Content="Del" />
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<Button Command="{Binding DoneCommand}" Content="Done" />
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</StackPanel>
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<ListBox>
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<ListBoxItem Content="aaa" />
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<ListBoxItem Content="bbb" />
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<ListBoxItem Content="ccc" />
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</ListBox>
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</DockPanel>
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</UserControl>
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```
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|
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```cs
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115
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using Prism.Commands;
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116
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using Prism.Mvvm;
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117
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using System;
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118
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using System.Collections.ObjectModel;
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119
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using System.Diagnostics;
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120
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using System.Linq;
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121
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+
|
122
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namespace Questions309980
|
123
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{
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124
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public class MainViewModel : BindableBase
|
125
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+
{
|
126
|
+
private bool _IsImageVisible = true;
|
127
|
+
public bool IsImageVisible { get => _IsImageVisible; set => SetProperty(ref _IsImageVisible, value); }
|
128
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+
|
129
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+
private TabItemBase _SelectedItem;
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130
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public TabItemBase SelectedItem { get => _SelectedItem; set => SetProperty(ref _SelectedItem, value); }
|
131
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+
|
132
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private string _StatusMessage;
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133
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public string StatusMessage { get => _StatusMessage; set => SetProperty(ref _StatusMessage, value); }
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134
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+
|
135
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public ObservableCollection<TabItemBase> TabItems { get; } = new();
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136
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+
|
137
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public DelegateCommand<Type> Command { get; }
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138
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+
|
139
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+
|
140
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public MainViewModel()
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141
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+
{
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142
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+
Command = new(type =>
|
143
|
+
{
|
144
|
+
// ImageのVisibilityを切り替える
|
145
|
+
IsImageVisible = false;
|
146
|
+
|
147
|
+
// switch文等で作り分けてもいいが、面倒なので型(Type)から直で生成
|
148
|
+
var item = (TabItemBase)Activator.CreateInstance(type);
|
149
|
+
|
150
|
+
// item追加
|
151
|
+
TabItems.Add(item);
|
152
|
+
|
153
|
+
// item選択
|
154
|
+
SelectedItem = item;
|
155
|
+
|
156
|
+
// CanExecuteを再確認させる
|
157
|
+
Command.RaiseCanExecuteChanged();
|
158
|
+
|
159
|
+
StatusMessage = $"{type.Name} 読み込み";
|
160
|
+
},
|
161
|
+
// 同じボタンは2回押せないようにする(TabItemsにすでに同じ型があるかどうか)
|
162
|
+
type => !TabItems.Any(x => x.GetType().Equals(type)));
|
163
|
+
}
|
164
|
+
}
|
165
|
+
|
166
|
+
public abstract class TabItemBase : BindableBase
|
167
|
+
{
|
168
|
+
public string TabHeader { get; }
|
169
|
+
public TabItemBase(string header) => TabHeader = header;
|
170
|
+
}
|
171
|
+
|
172
|
+
public class ToDoViewModel : TabItemBase
|
173
|
+
{
|
174
|
+
public DelegateCommand AddCommand { get; }
|
175
|
+
public DelegateCommand DelCommand { get; }
|
176
|
+
public DelegateCommand DoneCommand { get; }
|
177
|
+
|
178
|
+
|
179
|
+
public ToDoViewModel() : base("ToDo")
|
180
|
+
{
|
181
|
+
AddCommand = new(() => Debug.WriteLine("AddCommand"));
|
182
|
+
DelCommand = new(() => Debug.WriteLine("DelCommand"));
|
183
|
+
DoneCommand = new(() => Debug.WriteLine("DoneCommand"));
|
184
|
+
}
|
185
|
+
}
|
186
|
+
|
187
|
+
public class CalendarViewModel : TabItemBase
|
188
|
+
{
|
189
|
+
private DateTime _SelectedDate;
|
190
|
+
public DateTime SelectedDate { get => _SelectedDate; set => SetProperty(ref _SelectedDate, value); }
|
191
|
+
|
192
|
+
public DelegateCommand HogeCommand { get; }
|
193
|
+
|
194
|
+
|
195
|
+
public CalendarViewModel() : base("Calendar") => HogeCommand = new(() => Debug.WriteLine(SelectedDate));
|
196
|
+
}
|
197
|
+
}
|
198
|
+
```
|
199
|
+
|
200
|
+
`BindableBase`・`DelegateCommand`は、`Prism.Core`を使用しました。
|
201
|
+
[NuGet Gallery | Prism.Core 8.0.0.1909](https://www.nuget.org/packages/Prism.Core/)
|
202
|
+
|
203
|
+
特に指定がないので.NET 5.0で書きました^^
|
204
|
+
.NET Framework 4.8等では、`new()`でエラーが出るので型を書いてください。
|
205
|
+
|
206
|
+
[Target-typed new expressions - C# 9.0 specification proposals | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/csharp/language-reference/proposals/csharp-9.0/target-typed-new)
|
207
|
+
[ターゲットからの new 型推論 | ++C++; // 未確認飛行 C](https://ufcpp.net/study/csharp/oo_construct.html#target-typed-new)
|
208
|
+

|
209
|
+
|
210
|
+
---
|
211
|
+
|
212
|
+
[[Q&A] WPF MVVMの学習 - Qiita](https://qiita.com/choni-k/questions/8973d506bcca4722ce2c)
|
213
|
+
|
214
|
+
> teratailでは、マルチポスト※の推奨はしていません。
|
215
|
+
|
216
|
+
[ヘルプ|teratail(テラテイル)](https://teratail.com/help#posted-otherservice)
|
217
217
|
上記確認の上、適切に対応してください。
|
3
もー
answer
CHANGED
@@ -139,7 +139,7 @@
|
|
139
139
|
|
140
140
|
public MainViewModel()
|
141
141
|
{
|
142
|
-
Command = new
|
142
|
+
Command = new(type =>
|
143
143
|
{
|
144
144
|
// ImageのVisibilityを切り替える
|
145
145
|
IsImageVisible = false;
|
2
HogeCommand
answer
CHANGED
@@ -189,10 +189,10 @@
|
|
189
189
|
private DateTime _SelectedDate;
|
190
190
|
public DateTime SelectedDate { get => _SelectedDate; set => SetProperty(ref _SelectedDate, value); }
|
191
191
|
|
192
|
-
public DelegateCommand
|
192
|
+
public DelegateCommand HogeCommand { get; }
|
193
193
|
|
194
194
|
|
195
|
-
public CalendarViewModel() : base("Calendar") =>
|
195
|
+
public CalendarViewModel() : base("Calendar") => HogeCommand = new(() => Debug.WriteLine(SelectedDate));
|
196
196
|
}
|
197
197
|
}
|
198
198
|
```
|
1
C#
answer
CHANGED
@@ -111,7 +111,7 @@
|
|
111
111
|
</UserControl>
|
112
112
|
```
|
113
113
|
|
114
|
-
```
|
114
|
+
```C#
|
115
115
|
using Prism.Commands;
|
116
116
|
using Prism.Mvvm;
|
117
117
|
using System;
|