/// <summary>
/// Invoked when the child items need to be loaded on demand.
/// Subclasses can override this to populate the Children collection.
/// </summary>
protected virtual void LoadChildren()
{
Children.AddRange(
new DirectoryInfo(FullPath).EnumerateDirectories()
.Where(dirInfo => FileSystemUtils.CanReadDirectory(dirInfo.FullName))
.OrderBy(dirInfo => dirInfo.Name, new StringWithNumericsComparer())
.Select(dirInfo => new FolderViewModel(new Folder(dirInfo.FullName), this)));
foreach (var model in Children.OfType <FolderViewModel>())
{
var dirInfo = new DirectoryInfo(model.FullPath);
if (!FileSystemUtils.CanReadDirectory(dirInfo.FullName) || !dirInfo.EnumerateDirectories().Any())
{
model.Children.Clear();
}
}
}