How To Test If ArrayList Control Has Zero Elements?
ArrayList is very useful class which you can use to manipulate collection of items in memory. You can add new items by using its Add() method.
One of common problems is how to check if ArrayList contains any element. Fortunately, solution is simple. To get number of ArrayList elements you need to use its Count() read only property. You can use this ASP.NET sample server side code:
[ C# ]
// To
use ArrayList, we need this namespace
using
System.Collections;
public
partial class
DefaultCS : System.Web.UI.Page
{
protected void
Page_Load(object sender, System.EventArgs
e)
{
// Declaration and instatiation of ArrayList
ArrayList MyList =
new ArrayList();
// Check is there any elements in ArrayList
if (MyList.Count == 0)
{
// ArrayList has no elements
}
else
{
// In this case, array list is not empty
}
}
}
[ VB.NET ]
' To use
ArrayList, we need this namespaces
Imports
System.Collections
Partial
Class _Default
Inherits System.Web.UI.Page
Protected Sub
Page_Load(ByVal sender
As Object, ByVal
e As System.EventArgs)
Handles Me.Load
' Declaration and instatiation of ArrayList
Dim MyList As
ArrayList = New ArrayList()
' Check is there any elements in ArrayList
If MyList.Count = 0
Then
' ArrayList has no elements
Else
' In this case, array list is not empty
End If
End Sub
End
Class
Related articles:
1. Debugging with "Stepping" and "Data Viewing" features
