Question

I have custom class that implement IEnumerable<int[]> interface and save current Enumerator. When added new element I need set enumerator to last element.

Sample code for set enumerator to end:

IEnumerable<int> seq = ...
seq.Reset();
for (int i = 0; i < seq.Count; i++)
{
  seq.MoveNext();    
}

How do this faster?
(Can I go to the end can’t not scroll all sequence elements?)

Answer 1

if faster means less code (another alternative is),

        IEnumerable<int> seq = ...

        while (seq.MoveNext())
        {
           var item = seq.Current;
        }

EDIT
you want seq.Last()
It is an extension method and has code similar to above.

EDIT2

i need seq.Current=seq.Last();

your code is similar to

        IEnumerable<int> seq = ...
        int count=0;
        //Following while is equivalent to seq.Count
        while (seq.MoveNext()) 
        {
           count++;
        }
        int i=0;
        while (i<count)
        {
          seq.MoveNext();
        }

Using IEnumerator only it is not possible to set seq.Current to Last in one iteration as you never know where to stop.