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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参考記事には肝心の`Photos`の定義がないですね。
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書き忘れたのか、あるいは自明だろうということで省略したのかもしれません。
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普通はViewModelに定義しますが、回答では`MainWindow`に書きました。
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`ObservableCollection`は、追加削除を通知するコレクションです(詳しくはググってください)
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```x
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```xml
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<Window
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x:Class="Questions354973.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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Width="800"
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Height="450">
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<Grid>
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<ListView
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ItemsSource="{Binding Photos}"
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ScrollViewer.HorizontalScrollBarVisibility="Disabled"
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SelectionMode="Single">
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<ListView.ItemsPanel>
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<ItemsPanelTemplate>
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<WrapPanel />
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</ItemsPanelTemplate>
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</ListView.ItemsPanel>
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<ListView.ItemTemplate>
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<DataTemplate>
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<Grid Width="300" Height="200">
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<Image Source="{Binding Title}" />
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<TextBlock Text="{Binding Url}" />
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</Grid>
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</DataTemplate>
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</ListView.ItemTemplate>
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</ListView>
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<Button
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MinWidth="75"
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Margin="10"
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HorizontalAlignment="Left"
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VerticalAlignment="Bottom"
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Click="Button_Click"
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Content="Button" />
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</Grid>
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</Window>
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```
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```
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```cs
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using Microsoft.WindowsAPICodePack.Dialogs;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Windows;
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namespace Questions354973
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{
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public class Photo
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{
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public string Title { get; set; }
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public string Url { get; set; }
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}
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public partial class MainWindow : Window
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{
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public ObservableCollection<Photo> Photos { get; } = new ObservableCollection<Photo>();
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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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using (var cofd = new CommonOpenFileDialog()
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{
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Title = "フォルダを選択してください",
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InitialDirectory = @"C:\",
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IsFolderPicker = true,
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})
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{
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if (cofd.ShowDialog() != CommonFileDialogResult.Ok) return;
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MessageBox.Show($"{cofd.FileName}を選択しました");
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var files = Directory.GetFiles(cofd.FileName, "*.png", SearchOption.AllDirectories);
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foreach (var file in files)
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{
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var photo = new Photo
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{
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Title = file,
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Url = file,
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};
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Photos.Add(photo);
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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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