protected override async Task OnParametersSetAsync()
{
if (null == this.Items && !string.IsNullOrEmpty(this.FeedUrl))
{
var expires = await this.Storage.GetItemAsync <DateTime?>(ItemsExpireProperty);
var items = await this.Storage.GetItemAsync <IEnumerable <RssItem> >(ItemsProperty);
if (expires.GetValueOrDefault() < DateTime.UtcNow || null == items)
{
await this.Storage.SetItemAsync(ItemsExpireProperty, DateTime.UtcNow.AddHours(1));
items = await RssItem.LoadAsync(this.FeedUrl, 3, new HttpClient());
await this.Storage.SetItemAsync(ItemsProperty, items);
}
this.Items = items;
}
await base.OnParametersSetAsync();
}