VB For-Each Iteration Count

Question

Does a For-Each loop in VB have an iteration count, or would I have to do that myself?

Answer 1

Unfortunately you have to do that yourself. The For Each construct uses an implementation the IEnumerator interface to iterate a sequence and the IEnumerator interface does not expose any members to indicate its position or current index within the sequence.

Answer 2

You would have to do it yourself. Mostly, if you're doing For Each (foreach in C#), then you don't care about iteration count.

Answer 3

Foreach loops for each element M it finds in a collection of M elements.

So, no, there is no explicit iteration count as there would be in a FOR loop.

Answer 4

If you are using Visual Studio 2009 (or VB.Net 9.0), you can use a Select override to get a count with the values.

For Each cur in col.Select(Function(x,i) New With { .Index = i, .Value = x })
 ...
Next

Answer 5

If I need a iterator variable, I use a for loop instead (every IEnumerable should have a .Count property)

Instead of:

For Each element as MyType in MyList
    ....
Next

write

For i as integer = 0 to MyList.Count - 1
    element = MyList(i)
    ....
Next

which will be the same result. You have i as an iterator and element holds the current element.