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 *     following disclaimer. 
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using System;
using System.ComponentModel;
using System.Windows.Forms;
using XenAPI;

namespace XenAdmin.Dialogs
{
    public partial class PvsSiteDialog : XenDialogBase
    {
        private readonly PVS_site pvsSite;

        /// <summary>
        /// Creates a dialog for viewing the PVS servers on a particular site.
        /// </summary>
        /// <param name="site">May not be null.</param>
        public PvsSiteDialog(PVS_site site)
            : base(site?.Connection)
        {
            System.Diagnostics.Debug.Assert(site != null);
            pvsSite = site;

            InitializeComponent();
            Text = string.Format(Messages.PVS_SITE_DIALOG_TITLE, pvsSite.Name().Ellipsise(50));

            System.Diagnostics.Debug.Assert(gridView.Columns.Count > 0);
            gridView.Columns[0].DefaultCellStyle.NullValue = null;

            RegisterEventHandlers();
            Rebuild();
        }

        private void RegisterEventHandlers()
        {
            UnregisterEventHandlers();
            connection.Cache.RegisterBatchCollectionChanged<PVS_server>(PvsServerBatchCollectionChanged);
        }

        private void UnregisterEventHandlers()
        {
            connection.Cache.DeregisterBatchCollectionChanged<PVS_server>(PvsServerBatchCollectionChanged);
        }

        private void PvsServerBatchCollectionChanged(object sender, EventArgs e)
        {
            Program.Invoke(this, Rebuild);
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            UnregisterEventHandlers();

            base.OnClosing(e);
        }

        private void Rebuild()
        {
            Program.AssertOnEventThread();

            try
            {
                gridView.SuspendLayout();
                gridView.Rows.Clear();

                foreach (var pvsServer in connection.ResolveAll(pvsSite.servers))
                {
                    var serverRow = NewPvsServerRow(pvsServer);
                    gridView.Rows.Add(serverRow);
                }
            }
            finally
            {
                gridView.ResumeLayout();
            }
        }

        private DataGridViewRow NewPvsServerRow(PVS_server pvsServer)
        {
            var ipAddressesCell = new DataGridViewTextBoxCell();
            var firstPortCell = new DataGridViewTextBoxCell();
            var lastPortCell = new DataGridViewTextBoxCell();

            ipAddressesCell.Value = string.Join(", ", pvsServer.addresses);
            firstPortCell.Value = pvsServer.first_port;
            lastPortCell.Value = pvsServer.last_port;

            var newRow = new DataGridViewRow { Tag = pvsSite };
            newRow.Cells.AddRange(ipAddressesCell, firstPortCell, lastPortCell);
            return newRow;
        }

        private void closeButton_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}