/// <summary>
/// Updates <see cref="AuthorList"/> with distinct sorted list of authors in <see cref="AllAssets"/>
/// </summary>
private void RefreshAuthorList()
{
List <AuthorDropdownViewModel> newAuthorList = new List <AuthorDropdownViewModel>();
// use GroupBy to get count of assets per author
foreach (IGrouping <string, AssetViewModel> author in AllAssets.GroupBy(a => a.Author))
{
newAuthorList.Add(new AuthorDropdownViewModel(author.Key, author.Count()));
}
newAuthorList = newAuthorList.OrderBy(a => a.Author).ToList();
newAuthorList.Insert(0, new AuthorDropdownViewModel(defaultAuthorValue, 0));
AuthorList = newAuthorList;
//clear selection if selected author not in list
if (AuthorList.Any(a => a.Author == AuthorToFilterBy.Author) == false)
{
AuthorToFilterBy = AuthorList[0];
}
}