ArrayList is one of the most flixible data structure from VB.NET Collections. ArrayList contains a simple list of values. Very easily we can add , insert , delete , view etc.. to do with ArrayList. It is very flexible becuse we can add without any size information , that is it grow dynamically and also shrink .
The following VB.NET source code shows some function in ArrayList
VB.NET SourceCode
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
VB.NET SourceCode
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer
Dim ItemList As New ArrayList()
ItemList.Add("Item4")
ItemList.Add("Item5")
ItemList.Add("Item2")
ItemList.Add("Item1")
ItemList.Add("Item3")
MsgBox("Shows Added Items")
ItemList.Add("Item5")
ItemList.Add("Item2")
ItemList.Add("Item1")
ItemList.Add("Item3")
MsgBox("Shows Added Items")
For i = 0 To ItemList.Count - 1
MsgBox(ItemList.Item(i))
Next
'insert an item
ItemList.Insert(3, "Item6")
ItemList.Insert(3, "Item6")
'sort itemms in an arraylist
ItemList.Sort()
ItemList.Sort()
'remove an item
ItemList.Remove("Item1")
ItemList.Remove("Item1")
'remove item from a specified index
ItemList.RemoveAt(3)
ItemList.RemoveAt(3)
MsgBox("Shows final Items the ArrayList")
For i = 0 To ItemList.Count - 1
MsgBox(ItemList.Item(i))
Next
End Sub
End Class
MsgBox(ItemList.Item(i))
Next
End Sub
End Class
Important functions in ArrayList
Add : Add an Item in an ArrayList
Insert : Insert an Item in a specified position in an ArrayList
Remove : Remove an Item from ArrayList
RemoveAt: remeove an item from a specified position
Sort : Sort Items in an ArrayList
How to add an Item in an ArrayList ?
Syntax : ArrayList.add(Item)
Item : The Item to be add the ArrayList
Dim ItemList As New ArrayList()
ItemList.Add("Item4")
How to Insert an Item in an ArrayList ?
Syntax : ArrayList.insert(index,item)
index : The position of the item in an ArrayList
Item : The Item to be add the ArrayList
ItemList.Insert(3, "item6")
How to remove an item from arrayList ?
Syntax : ArrayList.Remove(item)
Item : The Item to be add the ArrayList
ItemList.Remove("item2")
How to remove an item in a specified position from an ArrayList ?
Syntax : ArrayList.RemoveAt(index)
index : the position of an item to remove from an ArrayList
ItemList.RemoveAt(2)
How to sort ArrayList ?
Syntax : ArrayListSort()
When you execute this program , at first add five items in the arraylist and displays. Then again one more item inserted in the third position , and then sort all items. Next it remove the item1 and also remove the item in the third position . Finally it shows the existing items.
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