variablesi.vb

大名鼎鼎的mono是.NET平台的跨平台（支持linux

'Author:
'   V. Sudharsan ([e-mail])
'
' (C) 2005 Novell, Inc.
Option Strict Off

Imports System

Class Raiser
    Public Event Constructed()
    Public Sub New()
        RaiseEvent Constructed()
    End Sub
End Class


Module Test
    Private _x As Raiser

    Public Property x() As Raiser
        Get
            Return _x
        End Get

        Set(ByVal Value As Raiser)
            ' Unhook any existing handlers.
            If Not _x Is Nothing Then
                RemoveHandler _x.Constructed, AddressOf HandleConstructed
            End If

            ' Change value.
            _x = Value

            ' Hook-up new handlers.
            If Not _x Is Nothing Then
                AddHandler _x.Constructed, AddressOf HandleConstructed
            End If
        End Set
    End Property

    Sub HandleConstructed()
        Console.WriteLine("Constructed")
    End Sub

    Function Main() As Integer
        x = New Raiser()
    End Function
End Module