Question

Just like the title says; I want to use something like Mid(stringName, startIndex,[integerLength]), but instead of the third argument taking a string length, I want it to take the end character index. So in an example like this

alphabet = "ABCDEFG"
partial = *method I want to use*(alphabet, 2, 4) 'partial would equal "BC"

(Forgive me if my index numbers are off, but I hope you get my point.)

Does something like this exist in VB.NET?

Answer 1

You’ll want to use String.Substring

http://msdn.microsoft.com/en-us/library/aka44szs.aspx#Y0

dim alphabet as string = "ABCDEFG"
'partial is a reserved word!
'1,2 is the correct parameters to get 'BC'
dim partialString as string = alphabet.Substring(1, 2) 'partial would equal "BC"

Edit – Oooooh you want to do StartIndex,StopIndex not StartIndex,Length. Just apply a bit of math.

dim startIndex as integer = 1
dim stopIndex as integer = 3

'partial would equal "BC"
dim partialString as string = _
    alphabet.Substring(startIndex , stopIndex-startIndex ) 

I’d wrap that in an extension method on string, giving it a new name of course.