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Лямбды, LINQ, операторы и свои коллекции — Индексатор (свойство по умолчанию)

Фрагмент из «Лямбды, LINQ, операторы и свои коллекции»: Индексатор (свойство по умолчанию).

vb visual-basicencyclopedia11 embed URL статья в энциклопедии
Visual Basic main.vb 
Public Class Cache
    Private ReadOnly _data As New Dictionary(Of String, String)

    Default Public Property Item(key As String) As String
        Get
            Return _data(key)
        End Get
        Set(value As String)
            _data(key) = value
        End Set
    End Property
End Class

Dim c As New Cache()
c("user:1") = "Anna"
Console.WriteLine(c("user:1"))
Public Class Cache
    Private ReadOnly _data As New Dictionary(Of String, String)

    Default Public Property Item(key As String) As String
        Get
            Return _data(key)
        End Get
        Set(value As String)
            _data(key) = value
        End Set
    End Property
End Class

Dim c As New Cache()
c("user:1") = "Anna"
Console.WriteLine(c("user:1"))