Mega Code Archive
Use ArrayList Contains to check if a object already exists
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Imports System.Collections
Structure Person
Dim strLastName As String
Dim strFirstName As String
Dim strPhone As String
Dim strEMail As String
End Structure
public class Test
public Shared Sub Main
Dim alPersons As New ArrayList
Dim udtPerson As New Person
'Add the first person.
With udtPerson
.strLastName = "S"
.strFirstName = "J"
.strPhone = "5"
.strEMail = "j@s.com"
End With
alPersons.Add(udtPerson)
'Add the second person.
With udtPerson
.strLastName = "J"
.strFirstName = "S"
.strPhone = "5"
.strEMail = "s@s.com"
End With
alPersons.Add(udtPerson)
'Create the third person.
With udtPerson
.strLastName = "J"
.strFirstName = "K"
.strPhone = "5"
.strEMail = "k@s.com"
End With
'Insert the third person, but first check if they already exists.
If Not alPersons.Contains(udtPerson) Then
alPersons.Insert(1, udtPerson)
End If
'Remove the first person.
alPersons.RemoveAt(0)
'Display the array list values.
Console.WriteLine("The array list contains " & alPersons.Count & " elements.")
For Each udtPerson In alPersons
Console.WriteLine("NAME: " & udtPerson.strFirstName & " " & udtPerson.strLastName)
Next udtPerson
End Sub
End class
The array list contains 2 elements.
NAME: K J
NAME: S J
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