private async Task RefreshAsync()
{
var gists = await gistClientService.GetGistsAsync();
Gists.RemoveRange(Gists.Where(g => g.GetType() == typeof(CreateGistViewModel)).ToList());
var newGists = gists.Except(Gists.Select(g => g.Gist), gistEqualityComparer).ToList();
var deletedGists = Gists.Where(g => !gists.Contains(g.Gist, gistEqualityComparer)).ToList();
var existingGists = Gists.Where(g => gists.Contains(g.Gist, gistEqualityComparer)).ToList();
Gists.RemoveRange(deletedGists);
Gists.AddRange(newGists.Select(ng => new GistViewModel(ng, gistClientService, AsyncOperationStatusManager, ErrorHandler)));
foreach (var existingGist in existingGists)
{
HandleExistingGist(existingGist, gists.Single(g => g.Id == existingGist.Gist.Id));
}
}
