Katteker/Katteker.Gui/Wrapper.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using Katteker.Gui.Properties;

namespace Katteker.Gui
{
    /// <summary>
    ///     The wrapper to add Squirrel-capability to older Programs.
    /// </summary>
    public static class Wrapper
    {
        /// <summary>
        ///     Checks for Updates.
        /// </summary>
        /// <returns>Task</returns>
        public static Task CheckForUpdateAsync() => CheckForUpdateAsync(false);

        /// <summary>
        ///     Checks for Updates.
        /// </summary>
        /// <param name="isStartup">Is this Method called on Startup of the Program.</param>
        /// <returns>Task</returns>
        public static async Task CheckForUpdateAsync(bool isStartup)
        {
            using (var window = new UpdateWindow())
            {
                var dialogResult = DialogResult.Cancel;
                if (!UpdateManager.TryCreate(out var manager) && !isStartup)
                {
                    MessageBox.Show(Resources.SquirrelWrapper_CheckForUpdate,
                        Resources.SquirrelWrapper_CheckForUpdate_Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                var releases = (await manager.CheckForUpdateAsync().ConfigureAwait(true)).ToArray();
                window.UpdateManager = manager;
                window.ReleaseEntry = releases.LastOrDefault();
                if (isStartup)
                {
                    if (releases?.Any() == true)
                    {
                        dialogResult = window.ShowDialog();
                    }
                }
                else
                {
                    dialogResult = window.ShowDialog();
                }


                if (dialogResult == DialogResult.OK)
                {
                    manager.RestartApp();
                }
            }
        }
    }
}