/// <summary>
/// Returns sequence containing customers from Washington (WA) region and IDs of their orders placed on or after 1.1.1997.
/// </summary>
/// <returns>Collection with customers from Washington (WA) region and IDs of their orders placed on or after 1.1.1997.</returns>
public static IEnumerable <CustomerOrderDto> SelectMany()
{
List <Customer> customers = DataLoader.GetCustomerList();
// !!! INSERT YOUR LINQ MAGIC HERE !!!
return(new CustomerOrderDto[] { });
}
/// <summary>
/// Returns list of customers and how many orders each has.
/// </summary>
/// <returns>Dictionary where key is customer ID and value is count of their orders.</returns>
public static Dictionary <string, int> Count03()
{
List <Customer> customers = DataLoader.GetCustomerList();
// !!! INSERT YOUR LINQ MAGIC HERE !!!
return(new Dictionary <string, int>());
}
/// <summary>
/// Reurns one sequence that contains the common first letter from both product and customer names.
/// </summary>
/// <returns>Collection with common first letter from both product and customer names.</returns>
public static IEnumerable <char> Intersect02()
{
List <Product> products = DataLoader.GetProductList();
List <Customer> customers = DataLoader.GetCustomerList();
// !!! INSERT YOUR LINQ MAGIC HERE !!!
return(new char[] { });
}