About interface Enumerable and IEnumerator

[Tony]

Hello!

Interface IEnumerable consist of method GetEnumerator() which will return an
object of type IEnumerator.

Now to my question will every object that GetEnumerator return implement
Current, MoveNext and Reset.
I mean in this case I don't have to implement these three methods because
they are already accessible in the object that is returned from
GetEnumerator.

Is this correct understood ?

//Tony

[Marc Gravell]

I mean in this case I don't have to implement these three methods because

they are already accessible in the object that is returned from
GetEnumerator.

If you are writing your own iterator, then yes - they must be implemented
(either explicit or implicit implementation is fine).

However, in C# 2 and above, a lot of this is done for you via "yield
return"; this makes creating iterators very painless.

Marc

[Jon Skeet [C# MVP]]

On Feb 28, 2:25 pm, "Tony" <[e-mail]:

Interface IEnumerable consist of method GetEnumerator() which will return an
object of type IEnumerator.

Now to my question will every object that GetEnumerator return implement
Current, MoveNext and Reset.

Yes, otherwise that wouldn't be implementing IEnumerator.

I mean in this case I don't have to implement these three methods because
they are already accessible in the object that is returned from
GetEnumerator.

Is this correct understood ?

It's hard to understand exactly what you mean. If you're *calling*
GetEnumerator() then you're using someone else's implementation to
start with - you wouldn't be implementing them in the first place.

What problem are you trying to solve?

Jon

[Tony]

Hello!

In this example I don't have to implement the three method that
GetEnumerator returns. Do you mean that this is the most common situation
that you don't have to implement these three methods?

I didn't fully understood what you meant in the previous answer.

Person[] array =
{
new Person("532513-1234", "Olle", 34),
new Person("123456-4321", "Pelle", 12),
new Person("987654-5678", "Stina", 44)
};

public Form1()
{
IEnumerator iter = array.GetEnumerator();

while (iter.MoveNext())
Console.WriteLine(iter.Current);
...
}

//Tony

"Marc Gravell" <ma**********@gmail.comskrev i meddelandet
news:O3**************@TK2MSFTNGP05.phx.gbl...

I mean in this case I don't have to implement these three methods

because

they are already accessible in the object that is returned from
GetEnumerator.

If you are writing your own iterator, then yes - they must be implemented
(either explicit or implicit implementation is fine).

However, in C# 2 and above, a lot of this is done for you via "yield
return"; this makes creating iterators very painless.

Marc