velopack/samples/CSharpUno/UnoSample/MainViewModel.cs

using Velopack;

namespace UnoSample;

public partial class MainViewModel : ObservableObject
{
	private readonly UpdateManager _updateManager;

	public bool IsInstalled => _updateManager.IsInstalled;

	[ObservableProperty]
	[NotifyPropertyChangedFor(nameof(HasUpdate))]
	private UpdateInfo? _latestUpdate;

	public bool HasUpdate => LatestUpdate != null;

	public string CurrentVersion => _updateManager.CurrentVersion?.ToFullString() ?? "";

	[ObservableProperty]
	private string? _status;

	public MainViewModel()
	{
		var updateUrl = SampleHelper.GetReleasesDir(); // replace with your update path/url
		_updateManager = new UpdateManager(updateUrl!);
	}

	[RelayCommand(CanExecute = nameof(IsInstalled))]
	private async Task CheckForUpdates()
	{
		if (_updateManager.IsInstalled)
		{
			try
			{
				Status = "Checking for updates...";
				LatestUpdate = await _updateManager.CheckForUpdatesAsync();
				Status = LatestUpdate is null ? "No updates available" : $"{LatestUpdate.TargetFullRelease.Version} - Update available";
			}
			catch (Exception ex)
			{
				Status = ex.Message;
			}
		}
	}

	[RelayCommand(CanExecute = nameof(IsInstalled))]
	private async Task DownloadUpdates()
	{
		if (_updateManager.IsInstalled && LatestUpdate is { } latestUpdate)
		{
			try
			{
				Status = $"Downloading {0:p}";

				await _updateManager.DownloadUpdatesAsync(latestUpdate, progress => Status = $"Downloading {progress / 100.0:p}");
				Status = "Restarting...";
				_updateManager.ApplyUpdatesAndRestart(latestUpdate.TargetFullRelease);
			}
			catch (Exception ex)
			{
				Status = ex.Message;
			}
		}
	}
}