CODEWITHSUNDEEP
vb.net
Steven
Steven

Reputation: 13769

'For Each' VB.NET iteration count

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

Upvotes: 11

Views: 18834

Answers (5)

Jürgen Steinblock
Jürgen Steinblock

Reputation: 31723

If I need an 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.

Upvotes: 8

JaredPar
JaredPar

Reputation: 754715

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

Upvotes: 7

Matthew Jones
Matthew Jones

Reputation: 26190

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.

Upvotes: 0

John Saunders
John Saunders

Reputation: 161773

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.

Upvotes: 2

Andrew Hare
Andrew Hare

Reputation: 351516

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.

Upvotes: 9

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