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check variable for multiple values

Posted on 2004-08-22
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Last Modified: 2010-05-02
I want to check a variable for multiple values in one easy statement.  For example, in SQL I can say if @X in ('dog','bird') to see if @X contains those 2 values.  In VB, the only way I know is "if x = "dog" or x = "bird" ".  Anything similar to this in VB other than the case statement, i.e.

select case x
 case "bird","dog"
    'code goes here
end select

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Question by:TylerTheWimp
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12 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11865634
you can use instr() function:

if (instr(1,"bird dog cat",x) then ....
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 11865641
to avoid any confusion, you can use a separator:

If InStr(1, ",bird,dog,cat,tiger,lion,elephant,", "," & x & ",") Then .....


This will avoid any confusion, notice that starting and ending commas are required.
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Author Comment

by:TylerTheWimp
ID: 11865645
I need something that is not type specific.  So, it shouldn't matter if I 'm using ints, strings, objects, etc.
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 11865647
Sorry, maybe comma is not a good separator example, could be better:
f InStr(1, ":bird:dog:cat:tiger:lion:elephant:", ":" & x & ":") Then .....
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LVL 7

Expert Comment

by:Enlade
ID: 11865659

Dude, you answered your own question.  Try

Select Case X
  Case "bird", "dog"
    'code goes here
  Case Else
    'more code here
End Select
0
 
LVL 7

Expert Comment

by:Enlade
ID: 11865662

For instance, try this:

  Dim a As String
 
  a = "cat"
 
  Select Case a
    Case "cat", "dog"
      MsgBox "Hello"
    Case Else
      MsgBox "Goodbye"
  End Select
 

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Expert Comment

by:Enlade
ID: 11865672

Oh, my bad....I didn't see that you don't want to use case.  Sorry.
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 11865680
I think there is not such functionality, but you can declare an array:

Dim values() As Integer = {0, 1, 2, 3}

And create your own function like FindInArray(array, value) that returns true if a value is found in array.
0
 
LVL 7

Expert Comment

by:Enlade
ID: 11865690

Opps....gotta run...I can look at this later....but my suggestion for anyone that might want to solve this before I get back is to look at Collections.  Create a collection that contains each item ("dog", "cat", etc).  Gotta run.....
0
 
LVL 2

Author Comment

by:TylerTheWimp
ID: 11865694
The motive behind this question is laziness and obsessive complusive tendencies.  I hate writing out the variable name over and over again for one if statement.  If there is only one if statement and no "else" code to execute then I don't want to use a case statement since its ugly:

select case vSomeVariable
  case 1000.5, 1, "my name is wimp"
    'do code
  case else
    'do nothing
end select

i want a one liner soution:  if vSomeVariable in (1000.5, 1, "my name is wimp") then debug.print "stuff"
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Accepted Solution

by:
Jaime Olivares earned 250 total points
ID: 11865718
Maybe an "in" function could be very useful, still you can use my suggestion converting the searched value to string previous to calling instr, but, to maintain a collection of heterogeneous values (ints, strings, etc,) is definitively not a good practice.
0
 
LVL 76

Expert Comment

by:David Lee
ID: 11865820
Well, I see you've already accepted an answer but I'd still like to offer the following for whatever it's worth.

Private Sub Command1_Click()
    If ContainedIn("Joe", 1, Text1.Text, "joe", "Joe") Then
        Debug.Print "Found It"
    End If
End Sub

Private Function ContainedIn(varValue1 As Variant, ParamArray varValue2() As Variant) As Boolean
    Dim intTests As Integer
    For intTests = 0 To UBound(varValue2)
        If varValue1 = varValue2(intTests) Then
            ContainedIn = True
            Exit For
        End If
    Next
End Function
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