protected override async Task <double> ComputePrice()
{
InstallCost = _materialsService.GetInstallCost(_components);
_item.Components = new List <Item>();
var componentTasks = new List <Task <Item> >();
foreach (var comp in _components)
{
componentTasks.Add(_buildFunc(comp.Id, comp.Amount));
}
_item.Components = (await Task.WhenAll(componentTasks.ToArray())).ToList();
ComponentsCost = _item.Components.Sum(x => x.BestObtainingPrice);
return(InstallCost + ComponentsCost);
}