How to find what type or class an instance is based on

Sunday, 15 November 2009

Its alway very useful in VB.NET/ASP.NET to be able to find out whether or not a class is of a particular type, or is inherited. You can do this by using the typeof keyword in VB.NET for example if we were overloading an Arraylist, but wanting to check that an add is of the correct type when we could use the following snippet Imports Microsoft.VisualBasic Namespace Shop     Public Class OrderLinesCollection         Inherits ArrayList         Public Overrides Function Add(ByVal value As Object) As Integer             If TypeOf value Is OrderLine Then                 Return MyBase.Add(value)             Else                 Throw New NotSupportedException("You can only add OrderLines to this collection")             End If         End Function     End Class End Namespace

Last Updated ( Sunday, 13 December 2009 )