[RESOLVED] [02/03] ArrayList Search

How do you search an arraylist?

The code below skips the first value of the arraylist for some reason.

TokenNotLoaded = ArrayList that i'm trying to fill

Code:

---

                    TokenNotLoaded.Sort()
                    ''check to see if the token is already loaded into the array
                    Dim idx As Integer = TokenNotLoaded.BinarySearch(sToken, New CaseInsensitiveComparer)

                    If idx > 0 Then

                    Else

                        TokenNotLoaded.Add(tokenMatch.ToString)
                    End If

---

BinarySearch returns a Zero-based index if the item is found,
otherwise the return value is negative.
So you should change your If expression to include Zero.

VB Code:

TokenNotLoaded.Sort()
' Check to see if the token is already loaded into the array
Dim idx As Integer = TokenNotLoaded.BinarySearch(sToken, New CaseInsensitiveComparer)
 
If idx >= 0 Then
  ' Do Nothing
Else
  TokenNotLoaded.Add(tokenMatch.ToString)
End If

Regards,

- Aaron.

All arrays and collections are zero-based in .NET, so zero is always the index of the first item/element. Also, having an If...Else statement with only one of the blocks used is a bit silly. Unless you actually intend to add somethong else just reverse the condition:

VB Code:

If idx < 0 Then
    TokenNotLoaded.Add(tokenMatch.ToString())
End If