protobufUtility 1.0.4

using ProtoBuf;
using protobufUtility;

/** Inherit ProtoBufBaseData */
/** Require [ProtoContract] */
[ProtoContract]
class MyApplicationSettings : ProtoBufBaseData
{
    /** Require [ProtoMember(x)] to save value. x is need to be unique (and >=1 ?)
     * Type must be serializable!
     * For example, Rectangle isn't serializable. */
    [ProtoMember(1)]
    string _startPosition;

    public Rectangle StartPosition
    {
        get
        {
            var ar = _startPosition.Split(';');
            return new Rectangle(int.Parse(ar[0]), int.Parse(ar[1]), int.Parse(ar[2]), int.Parse(ar[3]));
        }

        set
        {
            _startPosition = string.Join(";", value.Left.ToString(), value.Top.ToString(), value.Width.ToString(), value.Height.ToString());
        }
    }

    /** Require [ProtoMember(x)] to save value. x is need to be unique (and >=1 ?) */
    [ProtoMember(2)]
    public DateTime LastTime;

    /** Require [ProtoMember(x)] to save value. x is need to be unique (and >=1 ?) */
    [ProtoMember(3)]
    public string InitialFolder;

    /** Require [ProtoMember(x)] to save value. x is need to be unique (and >=1 ?) */
    [ProtoMember(4)]
    public string DataFileFullPath;

    /** Require default constructor */
    public MyApplicationSettings()
    {
        StartPosition = default(Rectangle);
        InitialFolder = Application.StartupPath;
        DataFileFullPath = "mydata.dat";
    }
}

/** Inherit ProtoBufBaseData */
/** Require [ProtoContract] */
[ProtoContract]
class MyApplicationData : ProtoBufBaseData
{
    /** Require [ProtoMember(x)] to save value. x is need to be unique (and >=1 ?) */
    [ProtoMember(1)]
    public List<string> TargetFolders;

    /** Require default constructor */
    public MyApplicationData()
    {
        TargetFolders = new List<string>();
    }

    public void AddFolder(string folder)
    {
        TargetFolders.Add(folder);
    }
}

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

        /** Load settings */
        var settings = ProtoBufBaseData.Load<MyApplicationSettings>("settings.dat");
        settings.LastTime = DateTime.Now;

        /** Data */
        MyApplicationData myApplicationData = null;


        ListBox listBoxTargetFolders = new ListBox() { Parent = this, Dock = DockStyle.Top, };
        Button buttonAddFolder = new Button() { Parent = this, Dock = DockStyle.Top, Text = "Add folder", };

        MenuStrip menu = new MenuStrip() { Parent = this, };
        ToolStripMenuItem toolStripMenuItemFile = new ToolStripMenuItem() { Text = "File", };
        ToolStripMenuItem toolStripMenuItemCreate = new ToolStripMenuItem() { Text = "Create new data file", };
        ToolStripMenuItem toolStripMenuItemSave = new ToolStripMenuItem() { Text = "Save", };

        toolStripMenuItemFile.DropDownItems.Add(toolStripMenuItemCreate);
        toolStripMenuItemFile.DropDownItems.Add(toolStripMenuItemSave);

        menu.Items.Add(toolStripMenuItemFile);

        Action<string> CreateOrOpen = (fn) =>
        {
            /** Load data */
            myApplicationData = ProtoBufBaseData.Load<MyApplicationData>(fn);
            listBoxTargetFolders.Items.Clear();
            listBoxTargetFolders.Items.AddRange(myApplicationData.TargetFolders.ToArray());
            Text = string.Format("protobufUtilityTester, datafilename={0}", fn);

        };

        toolStripMenuItemCreate.Click += (sender, e) =>
        {
            SaveFileDialog sfd = new SaveFileDialog() { InitialDirectory = Application.StartupPath, };
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                CreateOrOpen(sfd.FileName);
                settings.DataFileFullPath = sfd.FileName;

            }
        };

        toolStripMenuItemSave.Click += (sender, e) =>
        {
            myApplicationData.Save();
        };

        buttonAddFolder.Click += (sender, e) =>
        {
            FolderBrowserDialog fbd = new FolderBrowserDialog() { SelectedPath = settings.InitialFolder, };
            if (fbd.ShowDialog() == DialogResult.OK)
            {
                settings.InitialFolder = fbd.SelectedPath;
                myApplicationData.TargetFolders.Add(fbd.SelectedPath);
                listBoxTargetFolders.Items.Add(fbd.SelectedPath);
            }
        };

        FormClosing += (sender, e) =>
        {
            /** Update settings */
            settings.StartPosition = new Rectangle(Left, Top, Width, Height);
            /** Update data. */
            myApplicationData.TargetFolders = listBoxTargetFolders.Items.Cast<string>().ToList();

            if (settings.SaveRequired)
            {
                while (true)
                {
                    /** Save settings if changed. */
                    if (settings.Save()) break;
                    var ret = MessageBox.Show("settings.dat save failed. Retry?", "Error", MessageBoxButtons.YesNo);
                    if (ret == DialogResult.Cancel)
                    {
                        e.Cancel = true;
                        return;
                    }
                    else if (ret == DialogResult.No)
                    {
                        break;
                    }
                }
            }

            if (myApplicationData.SaveRequired)
            {
                while (true)
                {
                    /** Save data if changed. */
                    if (myApplicationData.Save()) break;
                    var ret = MessageBox.Show(string.Format("{0} save failed. Retry?", myApplicationData.FileName), "Error", MessageBoxButtons.YesNo);
                    if (ret == DialogResult.Cancel)
                    {
                        e.Cancel = true;
                        return;
                    }
                    else if (ret == DialogResult.No)
                    {
                        break;
                    }
                }
            }
        };

        SizeChanged += (sender, e) =>
        {
            listBoxTargetFolders.Height = ClientSize.Height - buttonAddFolder.Height;
        };

        if (settings.StartPosition == default(Rectangle))
        {
            StartPosition = FormStartPosition.CenterScreen;
        }
        else
        {
            StartPosition = FormStartPosition.Manual;
            Location = new Point(settings.StartPosition.Left, settings.StartPosition.Top);
            Width = settings.StartPosition.Width;
            Height = settings.StartPosition.Height;
        }

        CreateOrOpen(settings.DataFileFullPath);
    }
}