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02.21.2008 at 12:17PM PST, ID: 23182463
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8.0

Problem with ignoring null or empty values returned from a LDAP query of AD using VB2005

Asked by WinkIT in Visual Studio, Active Directory

Tags: , ,

This is all being done in Visual Studio 2005 using Visual Basic.
This code works fine to input the search results into a datagrid.  However, when one of the fields is empty such as IPphone, mobile or any field for that mater, it bypass the following validator.

 If Not sruser.Properties("Mobile") Is Nothing

Since it passes the check, it then tries to execute:

Then Mobile = sruser.Properties("Mobile").Item(0)

Where Mobile is previously declared string.  When it tries to access that property, I recieve the given error.

I was wondering what type of check i need to create in order to catch these returns.  I've also tried a:

property.ToString = "" check and it fails as well.

Thanks in advance!Start Free Trial 
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Dim deuser As DirectoryEntry
        Dim dsuser As DirectorySearcher
        Dim srusers As SearchResultCollection
 
 
        Try
 
            'create table to sort by lastname, firstname
            Dim tbSearchResults As New DataTable
            tbSearchResults.Columns.Add(New DataColumn("Employee"))
            tbSearchResults.Columns.Add(New DataColumn("Extension"))
            tbSearchResults.Columns.Add(New DataColumn("DirectDial"))
            tbSearchResults.Columns.Add(New DataColumn("Mobile"))
            tbSearchResults.Columns.Add(New DataColumn("Location"))
 
            'for AD search
            deuser = New DirectoryEntry("ldap://server.domain.com", "username", "password")
            dsuser = New DirectorySearcher("ldap://ADserver")
            dsuser.Filter = GetFilterString()
            dsuser.Sort.PropertyName = "sn"
            srusers = dsuser.FindAll
 
            If srusers Is Nothing Then
 
            Else
                'loop through users in search results
                For Each sruser As SearchResult In srusers
                    'assign names to variables
                    Dim fname As String = sruser.Properties("givenname").Item(0)
                    Dim lname As String = sruser.Properties("sn").Item(0)
                    Dim telephoneNumber As String = ""
                    If Not sruser.Properties("telephoneNumber") Is Nothing Then telephoneNumber = sruser.Properties("telephoneNumber").Item(0)
                    Dim IPphone As String = ""
                    If Not sruser.Properties("IPphone") Is Nothing Then IPphone = sruser.Properties("IPphone").Item(0)
                    Dim Mobile As String = ""
                    If Not sruser.Properties("Mobile") Is Nothing Then Mobile = sruser.Properties("Mobile").Item(0)
                    Dim Location As String = ""
                    If Not sruser.Properties("Physicaldeliveryofficename") Is Nothing Then Location = sruser.Properties("Physicaldeliveryofficename").Item(0)
                    Dim MidInitial As String = ""
                    If Not sruser.Properties("initials") Is Nothing Then MidInitial = CType(sruser.Properties("initials").Item(0), String).Substring(0, 1)
                    Dim AdsPath As String
                    AdsPath = sruser.Properties("AdsPath").Item(0)
 
 
 
                    'Exclude if in Termed Employees
                    If AdsPath.IndexOf("OU=Termed Employees") = -1 Then
                        'add a row to the Search Results with the AD info for the user
                        Dim drRow(4) As String
                        drRow(0) = lname + ", " + fname + " " + MidInitial
                        drRow(1) = telephoneNumber
                        drRow(2) = IPphone
                        drRow(3) = Mobile
                        drRow(4) = Location
 
                        tbSearchResults.Rows.Add(drRow)
 
 
                    End If
 
                Next
 
                'sort it
                Dim dvSearchResults As DataView = tbSearchResults.DefaultView
                dvSearchResults.Sort = "Employee"
 
                'only print if data is present
                If dvSearchResults.Count > 0 Then
                    DGrid.DataSource = tbSearchResults
                    DGrid.Refresh()
                End If
 
            End If
 
        Catch ex As Exception
            Dim sError As String = ex.Message.ToString
            Label1.Text = sError
        Finally
            'clean up
            If Not deuser Is Nothing Then deuser.Close()
            If Not deuser Is Nothing Then deuser.Dispose()
            If Not dsuser Is Nothing Then dsuser.Dispose()
            If Not srusers Is Nothing Then srusers.Dispose()
        End Try
    End Sub
[+][-]02.22.2008 at 02:18AM PST, ID: 20955965

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About this solution

Zones: Visual Studio, Active Directory
Tags: Visual Basic, LDAP, IE, Firefox, Index was out of range. Must be non-negative and less than the size of the collection.
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Solution Provided By: Chris-Dent
Participating Experts: 1
Solution Grade: A
 
 
[+][-]02.22.2008 at 07:03AM PST, ID: 20957946

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