defaultpropd.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.

Imports System

Class base
    Default Public ReadOnly Property Item(ByVal i As Integer) As Integer
        Get
            Return i
        End Get
    End Property
    Default Public ReadOnly Property Item(ByVal i As Integer, ByVal j As Integer) As Integer
        Get
            Return i + j
        End Get
    End Property
End Class

Class derive
    Inherits base
    Default Public Overloads ReadOnly Property Item(ByVal i As Integer) As Integer
        Get
            Return 2 * i
        End Get
    End Property
End Class

Module DefaultA
    Function Main() As Integer
        Dim a As derive = New derive()
        Dim i, j As Integer
        i = a(10)
        j = a(10, 20)
        If i <> 20 Then
            System.Console.WriteLine("Default Not Working") : Return 1
        End If
        If j <> 30 Then
            System.Console.WriteLine("Default Not Working") : Return 1
        End If
    End Function
End Module