XAMLを使わないWPF入門18「ListView + GridViewでヘッダー付き表示」

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net8.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <UseWPF>true</UseWPF>
  </PropertyGroup>

</Project>

using System;
using System.Windows;

namespace NoXAML18ListView;

public class App : Application
{
    [STAThread]
    public static void Main(string[] args)
    {
        var app = new App();
        app.Run();
    }

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        var win = new MainWindow();
        win.Show();
    }
}

using System.Windows;

[assembly:ThemeInfo(
    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
                                                //(used if a resource is not found in the page,
                                                // or application resource dictionaries)
    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
                                                //(used if a resource is not found in the page,
                                                // app, or any theme specific resource dictionaries)
)]

using System.Diagnostics;
using System.IO;
using System.Windows.Controls;

public class FileListView : ListView
{
    string _currentDirectory;

    public string CurrentDirectory
    {
        get
        {
            return _currentDirectory;
        }
        set
        {
            if (_currentDirectory == value) return;

            _currentDirectory = value;
            Update();
        }
    }
    public FileListView()
    {
        _currentDirectory = Environment.CurrentDirectory;

        this.InitializeView();
    }
    // ビューの初期化
    private void InitializeView()
    {
        var gridView = new GridView();

        // ヘッダーカラムの登録
        gridView.Columns.Add(new GridViewColumn
        {
            Header = "名前",
            DisplayMemberBinding = new System.Windows.Data.Binding("Name"),
            Width = 300
        });

        this.View = gridView;
    }
    // 更新
    public void Update()
    {
        var sw = Stopwatch.StartNew();
        // 項目のクリア
        this.Items.Clear();

        List<FileItem> list = [];

        // ファイルの一覧を取得
        foreach (var e in Directory.EnumerateFileSystemEntries(CurrentDirectory))
        {
            // 項目の生成と追加
            list.Add (new FileItem
            {
                Name = Path.GetFileName(e),
                FullPath = e,
            });
        }

        // 項目をリストビューに追加
        this.ItemsSource = list;
        sw.Stop();
        Debug.Print($"{sw.ElapsedMilliseconds}ms");
    }
    // 項目クラス
    private class FileItem
    {
        public string Name { get; set; } = "";
        public string FullPath { get; set; } = "";
    }    
}

using System.Windows;
using System.Windows.Controls;

namespace NoXAML18ListView;
public class MainWindow : Window
{
    FileListView _fileListView;
    public MainWindow()
    {
        this.Title = "NoXAML MainWindow";
        this.Width = 400;
        this.Height = 300;

        this._fileListView = new FileListView();
        this.Content = this._fileListView;

        this.Loaded += (sender, e) =>
        {
            const string dir = @"J:\Pictures";
            this._fileListView.CurrentDirectory = dir;
        };
    }
}