IEnumerable

[bpayne111]

Anyone up for explaining IEnumerable and IEnumerator?
Im familiar with Interfaces, and i slightly understand the purpose of these 2 in particular. The help files have left me pretty confused. A tiny snippit of code would be wonderful.

Thanks

 

[Divil]

The IEnumerable interface is something that a class implements when it wants to be enumerator. It forces the class to expose a GetEnumerator function, which will return a class implementing the IEnumerator interface.

Any class implementing that second interface must expose a property reflecting the current item in the enumeration, and a method for moving forward and moving to the start of the iteration.

You dont always see these interfaces, but when you use a For Each statement (foreach in C#) it is using them under the hood.

 

[bpayne111]

yes actually that is the part that i understood, i do not understand how im supposed to implement it so that it works correctly with a for each statement
in other words i understand the concept but not the actual coding of the interface itself
care to explain a lil more?

thanks

 

[bpayne111]

ok so ive done some more research at msdn so id like to know if i got this right...
if i create a class that implements IEnumerable and then define my own movenext method...When i use a For Each... Next statement it will work according to how i defined it in MoveNext?
so hypethetically i could actually make it only enumerate through 1 item of a list if id like?

hmmm interesting
let me know

ps divil... one of these days im gonna help you lol

thanks

 

[Divil]

Yeah, something like that. Truth be told Ive never implemented an enumerator manually, all my collections inherit from CollectionBase so it hasnt been a concern.

 

[bpayne111]

yes i was about to guess that lol
thanks for your help