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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```
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```xml
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<TextBox Text="{Binding Contents, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
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<TextBox Text="{Binding Contents, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
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```
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```
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これで十分なら話は早いです。これだけで機能します。
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これで十分なら話は早いです。これだけで機能します。
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---
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---
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`PropertyChanged`にできない（したくない）場合は、タブの切り替え時に`TextBox`の`LostFocus`が呼ばれないようなので、無理やり呼ぶような感じでしょうか。
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`PropertyChanged`にできない（したくない）場合は、タブの切り替え時に`TextBox`の`LostFocus`が呼ばれないようなので、無理やり呼ぶような感じでしょうか。
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```
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```cs
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using System.Collections.ObjectModel;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Input;
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namespace Questions279056
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namespace Questions279056
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{
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{
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public partial class MainWindow : Window
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public partial class MainWindow : Window
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{
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{
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public ObservableCollection<TabItem> Tabs { get; set; } = new ObservableCollection<TabItem>();
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public ObservableCollection<TabItem> Tabs { get; set; } = new ObservableCollection<TabItem>();
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public MainWindow()
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public MainWindow()
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{
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{
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InitializeComponent();
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InitializeComponent();
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DataContext = Tabs;
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DataContext = Tabs;
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Tabs.Add(new TabItem { Header = "Tab1", Contents = "aaa" });
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Tabs.Add(new TabItem { Header = "Tab1", Contents = "aaa" });
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Tabs.Add(new TabItem { Header = "Tab2", Contents = "bbb" });
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Tabs.Add(new TabItem { Header = "Tab2", Contents = "bbb" });
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Tabs.Add(new TabItem { Header = "Tab3", Contents = "ccc" });
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Tabs.Add(new TabItem { Header = "Tab3", Contents = "ccc" });
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Tab.IsSynchronizedWithCurrentItem = true;
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Tab.IsSynchronizedWithCurrentItem = true;
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Tab.Items.CurrentChanging += Items_CurrentChanging;
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Tab.Items.CurrentChanging += Items_CurrentChanging;
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}
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}
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private void Items_CurrentChanging(object sender, CurrentChangingEventArgs e)
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private void Items_CurrentChanging(object sender, CurrentChangingEventArgs e)
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{
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{
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if(Keyboard.FocusedElement is TextBox textBox)
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if(Keyboard.FocusedElement is TextBox textBox)
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textBox.RaiseEvent(new RoutedEventArgs(LostFocusEvent));
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textBox.RaiseEvent(new RoutedEventArgs(LostFocusEvent));
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}
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}
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}
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}
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public class TabItem
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public class TabItem
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{
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{
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public string Header { get; set; }
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public string Header { get; set; }
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public string Contents { get; set; }
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public string Contents { get; set; }
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}
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}
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}
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}
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```
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```
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（もうちょっとましな方法がある気がする^^;
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