Why does my VB.NET array have extra values?

Question

I declare my array

Dim A(N) As Integer

When I loop from 1 To N or 0 To N-1 there's an extra value at one end or the other.

What's going on?

_{(Intended to be a canonical question/answer.)}

You will get the reasoning behind that in this: stackoverflow.com/questions/506207/… — Rahul Tripathi
– Rahul Tripathi, Commented Apr 24, 2015 at 6:51

Graham · Accepted Answer · 2017-09-22 14:22:21Z

0

In VB.NET arrays almost always* have a lower bound of 0 and are declared mentioning their upper bound, not their length.

They did change the VB.NET syntax early on to allow you to remind yourself if needed:

Dim A(0 To N) As Integer

That 0 can't be anything else (such as a 1 or a constant zero).

You can loop through all VB.NET array indexes using

For i = LBound(A) To UBound(A)

or, more simply,

For i = 0 To N

(*) You can use the .NET Framework to create arrays with other lower bounds, but you need to refer to them as Array and thus with late binding (and probably Option Strict Off).

edited Sep 22, 2017 at 14:22

Graham

7,86020 gold badges67 silver badges92 bronze badges

answered Apr 24, 2015 at 6:46

Mark Hurd

11k10 gold badges74 silver badges106 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Damien_The_Unbeliever Over a year ago

It's not strictly true that arrays in VB.Net always have a lower bound of zero, see this overload of Array.CreateInstance. It's just that anyone found writing such code should never be allowed near computers again.

Collectives™ on Stack Overflow

Why does my VB.NET array have extra values?

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related