/// <summary>Shows all types of materials on the page.</summary>
/// <param name="pageNumber">The number of current page.</param>
/// <returns>Materials list page.</returns>
public async Task <ActionResult> DisplayAll(int pageNumber = 1)
{
var materials = await _materialService.GetMaterialsWithFile(pageNumber, PageSize);
var statistic = materials.ToDictionary(m => m.Id, m => new MaterialStatisticViewModel
{
AllWordsCount = _materialService.WordsCountInMaterial(m)
});
var model = new DisplayAllViewModel(PageSize, pageNumber, _materialService.TotalCount(), materials, statistic);
return(View(model));
}