Multisite - GetImages

List<Image> GetImages(Expression<Func<Image, bool>> whereClause) {
    var allImages = new List<Image>();

    //Get all provider names for the site
    var providerNames = SystemManager.CurrentContext.CurrentSite.SiteDataSourceLinks
        .Where(o => o.DataSourceName == typeof(LibrariesManager).FullName)
        .Select(o => o.ProviderName);

    //Loop them, passing the whereClause to each
    foreach (var providerName in providerNames) {
        var providerImages = LibrariesManager.GetManager(providerName).GetImages();

        //Apply only if provided
        if (whereClause != null) {
            providerImages = providerImages.Where(whereClause);
        }

        //Add to the list
        allImages.AddRange(providerImages);
    }

    //Done
    return allImages;
}