本文整理汇总了C#中System.Collections.ObservableCollection.IsNullOrEmpty方法的典型用法代码示例。如果您正苦于以下问题：C# ObservableCollection.IsNullOrEmpty方法的具体用法？C# ObservableCollection.IsNullOrEmpty怎么用？C# ObservableCollection.IsNullOrEmpty使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Collections.ObservableCollection的用法示例。
在下文中一共展示了ObservableCollection.IsNullOrEmpty方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: LoadFavoritesAudios
private async void LoadFavoritesAudios(CancellationToken token)
{
IsWorking = true;
OnTaskStarted("favorites");
FavoritesTracks = new ObservableCollection<Audio>();
try
{
int offset = 0;
int count = 50;
int requestsCount = 0;
while (FavoritesTracks != null && FavoritesTracks.Count < MAX_WALL_AUDIOS)
{
var a = await DataService.GetFavoritesAudio(count, offset, 0, token);
if (a == null || a.Count == 0)
break;
else if (a.Count > 0)
{
OnTaskFinished("favorites");
}
if (token.IsCancellationRequested)
{
Debug.WriteLine("Favorites audios cancelled");
break;
}
offset += count;
foreach (var audio in a)
{
FavoritesTracks.Add(audio);
}
requestsCount++;
if (requestsCount >= 2) //не больше 2-х запросов в секунду
{
requestsCount = 0;
await Task.Delay(1000);
}
Debug.WriteLine("Loading more audios from favorites");
}
if (FavoritesTracks.IsNullOrEmpty() && !token.IsCancellationRequested)
OnTaskError("favorites", ErrorResources.LoadAudiosErrorEmpty);
}
catch (Exception ex)
{
LoggingService.Log(ex);
OnTaskError("favorites", ErrorResources.LoadAudiosErrorCommon);
}
IsWorking = false;
OnTaskFinished("favorites");
}示例2: LoadNewsAudios
private async void LoadNewsAudios(CancellationToken token)
{
IsWorking = true;
OnTaskStarted("news");
NewsTracks = new ObservableCollection<Audio>();
try
{
var nextFrom = string.Empty;
int count = 150;
int requestsCount = 0;
while (NewsTracks != null && NewsTracks.Count < MAX_NEWS_AUDIOS)
{
if (token.IsCancellationRequested)
{
Debug.WriteLine("News audio cancelled");
break;
}
var a = await DataService.GetNewsAudio(count, nextFrom, token);
if (a.Items.IsNullOrEmpty())
break;
else if (a.Items.Count > 0)
{
OnTaskFinished("news");
}
if (token.IsCancellationRequested)
{
Debug.WriteLine("News audio cancelled");
break;
}
nextFrom = a.NextFrom;
foreach (var audio in a.Items)
{
NewsTracks.Add(audio);
}
requestsCount++;
if (requestsCount >= 2) //не больше 2-х запросов в секунду
{
requestsCount = 0;
await Task.Delay(1000);
}
Debug.WriteLine("Loading more audios from news");
}
if (NewsTracks.IsNullOrEmpty() && !token.IsCancellationRequested)
OnTaskError("news", ErrorResources.LoadAudiosErrorEmpty);
}
catch (Exception ex)
{
LoggingService.Log(ex);
OnTaskError("news", ErrorResources.LoadAudiosErrorCommon);
}
IsWorking = false;
OnTaskFinished("news");
}