public async Task LoadAllItems(BlogGroup group)
{
var cachedItems = await LoadCachedItems(group);
group.ItemCount = cachedItems.Count;
group.NewItemCount = 0;
var newItems = await LoadLiveItems(group);
foreach (var item in newItems.Where(i => !cachedItems.Contains(i, new BaseItemComparer())))
{
MessageDialog dialog = null;
try
{
var client = GetClient();
var page = await client.GetStringAsync(item.PageUri);
item.ImageUriList = new ObservableCollection <Uri>(BlogUtility.ExtractImagesFromPage(page));
foreach (var image in item.ImageUriList)
{
ImageUriManager.AddImage(item.Id, image);
}
}
catch (Exception ex)
{
dialog = new MessageDialog(ex.Message);
}
if (dialog != null)
{
await dialog.ShowAsync();
}
cachedItems.Add(item);
group.NewItemCount++;
await StorageUtility.SaveItem(group.Id.GetHashCode().ToString(), item);
}
foreach (var item in cachedItems.OrderByDescending(i => i.PostDate))
{
foreach (var image in item.ImageUriList)
{
ImageUriManager.AddImage(item.Id, image);
}
group.Items.Add(item);
}
}
private static async Task <List <BlogItem> > LoadLiveItems(BlogGroup group)
{
var info = NetworkInformation.GetInternetConnectionProfile();
if (info == null || info.GetNetworkConnectivityLevel() != NetworkConnectivityLevel.InternetAccess)
{
return(new List <BlogItem>());
}
MessageDialog dialog = null;
var retVal = new List <BlogItem>();
try
{
var client = GetSyndicationClient();
var feed = await client.RetrieveFeedAsync(group.RssUri);
foreach (var item in feed.Items.OrderBy(i => i.PublishedDate))
{
MessageDialog innerDialog = null;
try
{
var blogItem = new BlogItem {
Group = @group
};
var uri = string.Empty;
if (item.Links.Count > 0)
{
var link =
item.Links.FirstOrDefault(
l => l.Relationship.Equals("alternate", StringComparison.OrdinalIgnoreCase)) ??
item.Links[0];
uri = link.Uri.AbsoluteUri;
}
blogItem.Id = uri;
blogItem.PageUri = new Uri(uri, UriKind.Absolute);
blogItem.Title = item.Title != null ? item.Title.Text : "(no title)";
blogItem.PostDate = item.PublishedDate.LocalDateTime;
var content = "(no content)";
if (item.Content != null)
{
content = BlogUtility.ParseHtml(item.Content.Text);
}
else if (item.Summary != null)
{
content = BlogUtility.ParseHtml(item.Summary.Text);
}
blogItem.Description = content;
retVal.Add(blogItem);
}
catch (Exception ex)
{
innerDialog = new MessageDialog(ex.Message);
}
if (innerDialog != null)
{
await innerDialog.ShowAsync();
}
}
}
catch (Exception ex)
{
dialog = new MessageDialog(ex.Message);
}
if (dialog != null)
{
await dialog.ShowAsync();
}
return(retVal);
}