Overriding an IEnumerable

Hello, got this function from a tutorial and I'm trying to override it in a subclass, the code compiles fine but it doesn't call the base function, only the overriding one. Anyone can help me please? Thanks.


Base function

Code (CSharp):

1.  
2. #region ContextMenu
3.  
4.     // Invia le azioni del Context Menu.
5.     public virtual IEnumerable<ContextMenuAction> GetContextMenuActions(ContextMenu contextMenu)
6.     {
7.         // Accensione e spegnimento.
8.         if (powerButton == State.On)
9.         {
10.             yield return new ContextMenuAction
11.             {
12.                 LocalizationKey = LocalizationTable.GetLocalization("turn_machine_off", LocalizationName),
13.                 RequireCharacterSelected = false,
14.                 Action = (ca, c) => SetJob_TurnMachineOff()
15.             };
16.         }
17.         else if (powerButton == State.Off)
18.         {
19.             yield return new ContextMenuAction
20.             {
21.                 LocalizationKey = LocalizationTable.GetLocalization("turn_machine_on", LocalizationName),
22.                 RequireCharacterSelected = false,
23.                 Action = (ca, c) => SetJob_TurnMachineOn()
24.             };
25.         }
26.     }
27.  
28.     #endregion

Override

Code (CSharp):

1.  
2. #region ContextMenu
3.  
4.     // Invia le azioni del Context Menu.
5.     public override IEnumerable<ContextMenuAction> GetContextMenuActions(ContextMenu contextMenu)
6.     {
7.         base.GetContextMenuActions(contextMenu);
8.  
9.         // Ricarica di carburante.
10.         if (FuelLevel <= 0 && isWaitingForFuel == false)
11.         {
12.             yield return new ContextMenuAction
13.             {
14.                 LocalizationKey = LocalizationTable.GetLocalization("add_fuel", LocalizationName),
15.                 RequireCharacterSelected = false,
16.                 Action = (ca, c) => SetJob_AddFuel()
17.             };
18.         }
19.     }
20.  
21.     #endregion

 

You override functions to replace base code with overriding code. That's it, override replaces base. The behaviour you're talking about - don not call base function, but call override instead - is by design. You can manually call base code using

Code (CSharp):

1. base.GetContextMenuActions(...)

the 'base' keyword.

 

You can use the

IEnumerable<T>

type as an iterator in a foreach loop (you probably do that from somewhere outside). You can also store the

IEnumerable<T>

type in a variable to operate later on it.

But if you just call a method with a return type of

IEnumerable<T>

without doing something with it, all the returned items are going to nowhere.

What you have to do is the following:

Code (CSharp):

1.     // Invia le azioni del Context Menu.
2.     public override IEnumerable<ContextMenuAction> GetContextMenuActions(ContextMenu contextMenu)
3.     {
4.         IEnumerable<ContextMenuAction> baseItems = base.GetContextMenuActions(contextMenu);
5.  
6.         foreach (ContextMenuAction item in baseItems)
7.         {
8.             yield return item;
9.         }
10.    
11.         // Ricarica di carburante.
12.         if (FuelLevel <= 0 && isWaitingForFuel == false)
13.         {
14.             yield return new ContextMenuAction
15.             {
16.                 LocalizationKey = LocalizationTable.GetLocalization("add_fuel", LocalizationName),
17.                 RequireCharacterSelected = false,
18.                 Action = (ca, c) => SetJob_AddFuel()
19.             };
20.         }
21.     }

 

Thank you very much