回答編集履歴
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見直しキャンペーン中
test
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毎回newするパターン（`Window1`）と、
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Show Hideするだけのパターン（`Window2`）の両方用意しました。
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`MainWindow`の取得方法もいろいろ考えられますが、手間が少なそうな方法にしました。
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×ボタンや終了時の処理等、地味に罠があります。
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MainWindow
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```x
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```xml
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<Window
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x:Class="Questions247571.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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Title="MainWindow"
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Width="800"
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Height="450">
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<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
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<Button
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Margin="10"
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Click="Window1Button_Click"
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Content="Window1へ" />
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<Button
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Margin="10"
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Click="Window2Button_Click"
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Content="Window2へ" />
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</StackPanel>
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</Window>
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```
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```
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```cs
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using System.Windows;
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namespace Questions247571
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{
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public partial class MainWindow : Window
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{
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// こうだと Application.Current.MainWindow がWindow2になってしまうためNG
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//private Window2 window2 = new Window2();
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private Window2 window2;
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public MainWindow()
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{
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InitializeComponent();
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// Window2は閉じないのでデフォルト（OnLastWindowClose）だとアプリが終わらなくなる
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// MainWindowのCloseでアプリも終了
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// App.xamlで指定してよい
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Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
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window2 = new Window2();
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}
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private void Window1Button_Click(object sender, RoutedEventArgs e)
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{
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var window1 = new Window1();
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window1.Show();
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this.Hide();
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}
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private void Window2Button_Click(object sender, RoutedEventArgs e)
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{
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window2.Show();
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this.Hide();
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}
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}
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}
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```
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Window1
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```xml
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<Window
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x:Class="Questions247571.Window1"
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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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Title="Window1"
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Width="800"
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Height="450">
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<Grid>
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<TextBox Text="文字を書き換えてみよう
毎回新しく作るので状態は保存されない" />
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<Button
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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Click="Button_Click"
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Content="MainWindowへ" />
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</Grid>
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</Window>
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```
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```cs
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using System.ComponentModel;
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using System.Windows;
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namespace Questions247571
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{
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public partial class Window1 : Window
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{
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public Window1() => InitializeComponent();
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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// OnClosingへ
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// ×ボタンで閉じるとき等とまとめて処理
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this.Close();
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}
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protected override void OnClosing(CancelEventArgs e)
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{
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base.OnClosing(e);
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Application.Current.MainWindow.Show();
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// このあと閉じる
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}
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}
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}
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```
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Window2
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```xml
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<Window
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x:Class="Questions247571.Window2"
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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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Title="Window2"
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Width="800"
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Height="450">
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<Grid>
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<TextBox Text="文字を書き換えてみよう
非表示になってるだけなので状態は保存される" />
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<Button
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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Click="Button_Click"
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Content="MainWindowへ" />
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</Grid>
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</Window>
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```
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```cs
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using System.ComponentModel;
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using System.Windows;
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namespace Questions247571
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{
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public partial class Window2 : Window
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{
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public Window2() => InitializeComponent();
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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// OnClosingへ
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// ×ボタンで閉じるとき等とまとめて処理
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this.Close();
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}
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protected override void OnClosing(CancelEventArgs e)
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{
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base.OnClosing(e);
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// アプリ終了時に NullReferenceException が出るので ?. にしておく
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Application.Current.MainWindow?.Show();
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//private Window2 window2 = new Window2();
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private Window2 window2;
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public MainWindow()
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{
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InitializeComponent();
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// Window2は閉じないのでデフォルト（OnLastWindowClose）だとアプリが終わらなくなる
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// MainWindowのCloseでアプリも終了
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// App.xamlで指定してよい
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Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
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window2 = new Window2();
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}
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private void Window1Button_Click(object sender, RoutedEventArgs e)
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{
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var window1 = new Window1();
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window1.Show();
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this.Hide();
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// 閉じないようにキャンセル
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e.Cancel = true;
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}
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private void Window2Button_Click(object sender, RoutedEventArgs e)
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{
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window2.Show();
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this.Hide();
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}
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}
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}
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```
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Window1
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```xaml
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<Window
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x:Class="Questions247571.Window1"
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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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Title="Window1"
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Width="800"
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Height="450">
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<Grid>
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<TextBox Text="文字を書き換えてみよう
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<Button
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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Click="Button_Click"
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Content="MainWindowへ" />
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</Grid>
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</Window>
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```
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```C#
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using System.ComponentModel;
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using System.Windows;
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namespace Questions247571
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{
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public partial class Window1 : Window
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{
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public Window1() => InitializeComponent();
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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// OnClosingへ
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// ×ボタンで閉じるとき等とまとめて処理
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this.Close();
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}
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protected override void OnClosing(CancelEventArgs e)
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{
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base.OnClosing(e);
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Application.Current.MainWindow.Show();
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// このあと閉じる
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}
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}
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}
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```
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Window2
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```xaml
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<Window
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x:Class="Questions247571.Window2"
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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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Title="Window2"
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Width="800"
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Height="450">
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<Grid>
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<TextBox Text="文字を書き換えてみよう
非表示になってるだけなので状態は保存される" />
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<Button
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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Click="Button_Click"
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Content="MainWindowへ" />
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</Grid>
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</Window>
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```
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269
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```C#
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using System.ComponentModel;
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272
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273
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using System.Windows;
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274
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275
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276
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-
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277
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namespace Questions247571
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278
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279
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{
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281
|
-
public partial class Window2 : Window
|
|
282
|
-
|
|
283
|
-
{
|
|
284
|
-
|
|
285
|
-
public Window2() => InitializeComponent();
|
|
286
|
-
|
|
287
|
-
|
|
288
|
-
|
|
289
|
-
private void Button_Click(object sender, RoutedEventArgs e)
|
|
290
|
-
|
|
291
|
-
{
|
|
292
|
-
|
|
293
|
-
// OnClosingへ
|
|
294
|
-
|
|
295
|
-
// ×ボタンで閉じるとき等とまとめて処理
|
|
296
|
-
|
|
297
|
-
this.Close();
|
|
298
|
-
|
|
299
|
-
}
|
|
300
|
-
|
|
301
|
-
protected override void OnClosing(CancelEventArgs e)
|
|
302
|
-
|
|
303
|
-
{
|
|
304
|
-
|
|
305
|
-
base.OnClosing(e);
|
|
306
|
-
|
|
307
|
-
|
|
308
|
-
|
|
309
|
-
// アプリ終了時に NullReferenceException が出るので ?. にしておく
|
|
310
|
-
|
|
311
|
-
Application.Current.MainWindow?.Show();
|
|
312
|
-
|
|
313
|
-
this.Hide();
|
|
314
|
-
|
|
315
|
-
|
|
316
|
-
|
|
317
|
-
// 閉じないようにキャンセル
|
|
318
|
-
|
|
319
|
-
e.Cancel = true;
|
|
320
|
-
|
|
321
|
-
}
|
|
322
|
-
|
|
323
|
-
}
|
|
324
|
-
|
|
325
|
-
}
|
|
326
|
-
|
|
327
|
-
```
|
|
328
|
-
|
|
329
|
-
|
|
330
165
|
|
|
331
166
|
---
|
|
332
167
|
|
|
333
|
-
|
|
334
|
-
|
|
335
168
|
個人的には`Window`を次々出すより、`Page`として作成し`MainWindow`内で入れ替えるような作りが好みです。
|