public class Order
{
    public int OrderId { get; set; }
    public string Name { get; set; }
    public double Total { get; set; }
    public DateTime OrderDate { get; set; }
}

var repo = new InMemoryRepository<Order>();

// bring back the entire normal entity
var order = repo.Get(1);

// in this case we only need the order name
var orderName = repo.Get(1, x => x.Name);

// we can also bring back an anonymous type if needed
var anonymousType = repo.Get(1, x => new { Name = x.Name, IsExpensiveOrder = x.Total > 100.0 });

// or we can map it to a specific type we have defined like a ViewModel
var viewModel = repo.Get(1, x => new OrderViewModel() {Name = x.Name, IsExpensiveOrder = x.Total > 100.0});

// We have the same options with the GetAll, Find and FindAll as well
orderName = repo.Find(x => x.OrderId == 2, x => x.Name);
var anonymousTypes = repo.GetAll(x => new { Name = x.Name, IsExpensiveOrder = x.Total > 100.0 });
var viewModels = repo.FindAll(x => x.OrderId < 5, x => new OrderViewModel() { Name = x.Name, IsExpensiveOrder = x.Total > 100.0 });