1
我有一個面試的問題,並不能完成它&想知道正確的答案。如何返回所有訂單的所有訂單項目?
public interface ICustomer
{
string Name { get; }
IEnumerable<IOrder> Orders { get; }
}
public interface IOrder
{
IEnumerable<IOrderItem> OrderItems { get; }
}
public interface IOrderItem
{
IEnumerable<IProduct> Products { get; }
}
public interface IProduct
{
string Name { get; }
}
public class CustomersController : ApiController
{
public IEnumerable<IOrderItem> List(ICustomer customer)
{
// Return All OrderItems for all orders
}
}
[的SelectMany](https://msdn.microsoft.com/en-us/library/system.linq.enumerable.selectmany.aspx ) – stuartd