Imports System
Imports System.Collections
Imports System.Collections.Specialized
Public Class MyCollection
Inherits NameObjectCollectionBase
Private _de As New DictionaryEntry()
Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry
Get
_de.Key = Me.BaseGetKey(index)
_de.Value = Me.BaseGet(index)
Return _de
End Get
End Property
Public Sub New(d As IDictionary)
Dim de As DictionaryEntry
For Each de In d
Me.BaseAdd(CType(de.Key, String), de.Value)
Next de
End Sub 'New
Public ReadOnly Property AllKeys() As String()
Get
Return Me.BaseGetAllKeys()
End Get
End Property
Public ReadOnly Property AllValues() As Array
Get
Return Me.BaseGetAllValues()
End Get
End Property
Public ReadOnly Property AllStringValues() As String()
Get
Return CType(Me.BaseGetAllValues(GetType(String)), String())
End Get
End Property
End Class
Public Class SamplesNameObjectCollectionBase
Public Shared Sub Main()
Dim d As New ListDictionary()
d.Add("A", "a")
d.Add("B", "b")
d.Add("P", "p")
Dim myCol As New MyCollection(d)
Console.WriteLine("Initial state of the collection (Count = {0}):", myCol.Count)
PrintKeysAndValues(myCol)
Console.WriteLine("keys:")
Dim s As String
For Each s In myCol.AllKeys
Console.WriteLine(" {0}", s)
Next s
Console.WriteLine("values (Object):")
Dim o As Object
For Each o In myCol.AllValues
Console.WriteLine(" {0}", o.ToString())
Next o
Console.WriteLine("values (String):")
For Each s In myCol.AllValues
Console.WriteLine(" {0}", s)
Next s
End Sub
Public Shared Sub PrintKeysAndValues(myCol As MyCollection)
Dim i As Integer
For i = 0 To myCol.Count - 1
Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value)
Next i
End Sub
End Class
|
