Option Infer ON

Question

Does option infer not work in VBA?

I'm try to test out VB tutorial code on arrays in Microsoft Access.

Dim numbers = {{1, 2}, {3, 4}, {5, 6}}

This doesn't work without Option Infer ON, but you get compile error if you add it in.

Total noob question.

Answer 1

Option Infer指令是Visual Studio 2008中添加到VB.Net的功能。VBA编译器是完全不同的实现，从未为Option Infer更新，因此无法进行这项工作

Answer 2

Just to add to this post; though Option Infer is not present, in VBA you can still turn Option Explicit off which gives you a poor mans version. Be careful, however, as this isn't truly Option Infer . What you're doing is simply making VBA primarily use variants to store the values. The VBA engine then decides what the best subtype of variant is. For example:

Dim a, b
a = 2
b = 3.2
Debug.Print a * b

Will work quite happily. However, you can then go on to change the value later, like so...

Dim a, b
a = 2
b = 3.2
Debug.Print a * b
a = "Hello, World!"
Debug.Print a

Which works quite happily and produces the output:

 6.4
Hello, World!

Not the best practice.

Revision

Just to further reinforce the poor quality of this approach, I have had several experiences where the [original programmer's] code has happily crashed, bringing down the whole application, because variables were not properly defined.