/// <summary> /// Downloads the file at <see cref="linkToVersionXml"/> and attempts to deserialize it into <see cref="Sys.LastCheckedVersion"/>. /// Uses the download queue so this happens asynchronously. <see cref="UpdateCheckCompleted"/> is raised when the download is complete. /// </summary> public void CheckForUpdates() { string path = Path.Combine(Sys.PathToTempFolder, "version.xml"); Directory.CreateDirectory(Sys.PathToTempFolder); DownloadItem download = new DownloadItem() { Links = new List <string>() { LocationUtil.FormatHttpUrl(linkToVersionXml) }, SaveFilePath = path, Category = DownloadCategory.AppUpdate, ItemName = $"{ResourceHelper.Get(StringKey.CheckingForUpdatesAt)} {linkToVersionXml}" }; download.IProc = new Install.InstallProcedureCallback(e => { bool success = (e.Error == null && e.Cancelled == false); if (success) { try { Sys.LastCheckedVersion = Util.Deserialize <AvailableUpdate>(path); } catch (Exception ex) { Sys.LastCheckedVersion = Sys.LastCheckedVersion ?? new AvailableUpdate(); // if currently null then initialize new instance Sys.Message(new WMessage() { Text = $"{ResourceHelper.Get(StringKey.FailedToCheckForUpdatesAt)} {linkToVersionXml}: {ex.Message}", LoggedException = ex }); } } else { Sys.LastCheckedVersion = Sys.LastCheckedVersion ?? new AvailableUpdate(); Sys.Message(new WMessage() { Text = $"{ResourceHelper.Get(StringKey.FailedToCheckForUpdatesAt)} {linkToVersionXml}", LoggedException = e.Error }); } UpdateCheckCompleted?.Invoke(success); }); Sys.Downloads.AddToDownloadQueue(download); }
/// <summary> /// Raises the UpdateCheckCompleted event. /// </summary> /// <param name="e"></param> protected virtual Task OnUpdateCheckCompleted(UpdateCheckEventArgs e) { UpdateCheckCompleted?.Invoke(this, e); return(Task.FromResult(false)); }