C#のWinFormsでZipファイルのコメントを編集する。

using System.IO.Compression;

namespace EditCommentZipFile;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        // コマンドライン引数
        string[] args = System.Environment.GetCommandLineArgs();
        if (2 > args.Length)
        {
            this.Close();
            return;
        }

        // zipファイルのパス
        string filePath = args[1];
        if (!Path.GetExtension(filePath).Equals(".ZIP", StringComparison.CurrentCultureIgnoreCase))
        {
            this.Close();
            return;
        }

        // コメントの読み込み
        string comment = "";
        using(var fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite))
        using(var zip = new ZipArchive(fs, ZipArchiveMode.Update))
        {
            comment = zip.Comment;
        }

        Size = new Size(640, 360);
        Text = "ZIPファイルのコメント編集";

        var panel = new TableLayoutPanel
        {
            Dock = DockStyle.Fill,
            Padding = new Padding(16),
        };

        string msg = Path.GetFileName(filePath) + "のコメント";
        var label = new Label
        {
            Dock = DockStyle.Fill,
            Margin = new Padding(16),
            Text = msg,
        };
        panel.Controls.Add(label, 0, 0);

        var tbox = new TextBox
        {
            Dock = DockStyle.Fill,
            Margin = new Padding(16),
            Text = comment,
        };
        panel.Controls.Add(tbox, 0, 1);

        var panel2 = new FlowLayoutPanel
        {
            Margin = new Padding(16),
            Anchor = AnchorStyles.None,
            Dock = DockStyle.Fill,
        };
        panel.Controls.Add(panel2, 0, 2);

        var okBtn = new Button
        {
            Margin = new Padding(16),
            Size = new Size(100, 40),
            Text = "OK",
        };
        panel2.Controls.Add(okBtn);

        var cancelBtn = new Button
        {
            Margin = new Padding(16),
            Size = new Size(100, 40),
            Text = "Cancel",
        };
        panel2.Controls.Add(cancelBtn);

        Controls.Add(panel);
        Action<Form> okAction = (Form form) =>
        {
            string str = tbox.Text;
            using(var fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite))
            using(var zip = new ZipArchive(fs, ZipArchiveMode.Update))
            {
                zip.Comment = str;
            }
            form.Close();
        };
        Action<Form> cancelAction = (Form form) =>
        {
            form.Close();
        };
        okBtn.Click += (s, e) => okAction(this);
        tbox.KeyDown += (s, e) =>
        {
            if (e.KeyCode == Keys.Return)
            {
                okAction(this);
            }
        };
        cancelBtn.Click += (s, e) => cancelAction(this);
    }
}