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Jun 14th, 2009

VB.net search ArrayList

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How do you guys recommend searching an ArrayList for a specific string? My arraylist is defined as:

vb Syntax (Toggle Plain Text)
Public Shared VisioSwitchArray As New ArrayList()
 
    Public Structure switch
        Public HOSTNAME As String
        Public IP As String
        Public MODEL As String
        Public VLANS As String
        Public NEIs() As neighbor
    End Structure
 
    Public Structure neighbor
        Public IFACE As String
        Public DIST_IP As String
        Public DIST_IFACE As String
    End Structure
Public Shared VisioSwitchArray As New ArrayList()

    Public Structure switch
        Public HOSTNAME As String
        Public IP As String
        Public MODEL As String
        Public VLANS As String
        Public NEIs() As neighbor
    End Structure

    Public Structure neighbor
        Public IFACE As String
        Public DIST_IP As String
        Public DIST_IFACE As String
    End Structure

What I'm trying to compare is the IP string from the switch structure and the DIST_IP string from the neighbor structure. Problem is, using VisioSwitchArray.contains(some_ip_address) always returns false. I'm guessing it is searching for a matching switch object with in the list right?

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TheFueley

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Jun 14th, 2009

Re: VB.net search ArrayList

Quote ...

I'm guessing it is searching for a matching switch object with in the list right?

That's right.

You can't use Contains method in this case. You have to loop and cast to find the right value

VB.NET Syntax (Toggle Plain Text)
Dim i As Integer
 
For i = 0 To VisioSwitchArray.Count - 1
  If CType(VisioSwitchArray.Item(i), switch).IP = "10.0.0.2" Then
    ' Found
    Exit For
  End If
Next i
Dim i As Integer

For i = 0 To VisioSwitchArray.Count - 1
  If CType(VisioSwitchArray.Item(i), switch).IP = "10.0.0.2" Then
    ' Found
    Exit For
  End If
Next i

Teme64

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Jun 15th, 2009

Re: VB.net search ArrayList

Sweet! I will give it a try. In the mean time, I used a loop to String.Compare each item. Not what I wanted though. Thanks for the tip!

TheFueley

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Jun 15th, 2009

Re: VB.net search ArrayList

That worked great. Thank you!

TheFueley

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