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 async Task LoadAllGroups()
{
var existing = await LoadCachedGroups();
var live = await LoadLiveGroups();
foreach (var liveGroup in live
.Where(liveGroup => !existing.Contains(liveGroup, new BaseItemComparer())))
{
existing.Add(liveGroup);
await StorageUtility.SaveItem(GROUP_FOLDER, liveGroup);
}
foreach (var group in existing.OrderBy(e => e.Title))
{
GroupList.Add(group);
}
}
private static async Task <IList <BlogGroup> > LoadCachedGroups()
{
var retVal = new List <BlogGroup>();
foreach (var item in await StorageUtility.ListItems(GROUP_FOLDER))
{
try
{
var group = await StorageUtility.RestoreItem <BlogGroup>(GROUP_FOLDER, item);
retVal.Add(group);
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
return(retVal);
}
private static async Task <IList <BlogItem> > LoadCachedItems(BlogGroup group)
{
var retVal = new List <BlogItem>();
var groupFolder = group.Id.GetHashCode().ToString();
foreach (var item in await StorageUtility.ListItems(groupFolder))
{
try
{
var post = await StorageUtility.RestoreItem <BlogItem>(groupFolder, item);
post.Group = group;
retVal.Add(post);
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
return(retVal);
}