public async void GetGroupPhotosAsync(string groupId, Dictionary<string, string> parameters = null) { if (groupPhotoFetchingQueue.Contains(groupId)) return; groupPhotoFetchingQueue.Add(groupId); string timestamp = DateTimeUtils.GetTimestamp(); string nonce = Guid.NewGuid().ToString().Replace("-", null); Dictionary<string, string> paramDict = new Dictionary<string, string>(); paramDict["method"] = "flickr.groups.pools.getPhotos"; paramDict["format"] = "json"; paramDict["nojsoncallback"] = "1"; paramDict["oauth_consumer_key"] = consumerKey; paramDict["oauth_nonce"] = nonce; paramDict["oauth_signature_method"] = "HMAC-SHA1"; paramDict["oauth_timestamp"] = timestamp; paramDict["oauth_token"] = AccessToken; paramDict["oauth_version"] = "1.0"; paramDict["group_id"] = groupId; if (parameters != null) { foreach (var entry in parameters) { paramDict[entry.Key] = entry.Value; } } paramDict["extras"] = UrlHelper.Encode(commonExtraParameters); string paramString = GenerateParamString(paramDict); string signature = GenerateSignature("GET", AccessTokenSecret, "https://api.flickr.com/services/rest", paramString); string requestUrl = "https://api.flickr.com/services/rest?" + paramString + "&oauth_signature=" + signature; HttpWebResponse response = await DispatchRequest("GET", requestUrl, null).ConfigureAwait(false); using (StreamReader reader = new StreamReader(response.GetResponseStream())) { groupPhotoFetchingQueue.Remove(groupId); GetGroupPhotosExceptionEventArgs exceptionEvt = null; if (response.StatusCode != HttpStatusCode.OK) { HandleHTTPException(response); exceptionEvt = new GetGroupPhotosExceptionEventArgs(); exceptionEvt.GroupId = groupId; GroupPhotoException(this, exceptionEvt); return; } string jsonString = await reader.ReadToEndAsync().ConfigureAwait(false); if (!TryHandleResponseException(jsonString, () => { GetGroupPhotosAsync(groupId, parameters); })) { exceptionEvt = new GetGroupPhotosExceptionEventArgs(); exceptionEvt.GroupId = groupId; GroupPhotoException(this, exceptionEvt); return; } GetGroupPhotosEventArgs args = new GetGroupPhotosEventArgs(); args.GroupId = groupId; args.Response = jsonString; GroupPhotoReturned.DispatchEvent(this, args); } }
// Photo stream exception private void OnPhotoStreamException(object sender, GetGroupPhotosExceptionEventArgs e) { Dispatcher.BeginInvoke(() => { if (e.GroupId != Group.ResourceId) return; if (PhotoCollection.Count == 0) { StatusLabel.Text = AppResources.GenericPhotoLoadingErrorText; StatusLabel.Visibility = Visibility.Visible; PhotoStreamListView.Visibility = Visibility.Collapsed; } }); }
private void OnPhotoListException(object sender, GetGroupPhotosExceptionEventArgs e) { Dispatcher.BeginInvoke(() => { if (e.GroupId == GroupSource.ResourceId) if (SystemTray.ProgressIndicator != null) SystemTray.ProgressIndicator.IsVisible = false; }); }