Indexed Dictionary

I occasionally have a need for an indexed dictionary. Here is my solution:

Code:

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Public Class IndexedDictionary(Of TKey, TValue)

#Region "Properties"

    Private pCount As Integer
    <System.ComponentModel.Description("Gets the number of total pairs.")> _
    Public ReadOnly Property Count() As Integer
        Get
            Return pCount
        End Get
    End Property

    Private itms As List(Of KeyValuePair(Of TKey, TValue))
    <System.ComponentModel.Description("Gets the pairs.")> _
    Public ReadOnly Property Items() As List(Of KeyValuePair(Of TKey, TValue))
        Get
            Return itms
        End Get
    End Property

    Private key As List(Of TKey)
    Private ReadOnly Property Keys() As List(Of TKey)
        Get
            Return key
        End Get
    End Property

    Private uniqueKeys As Boolean
    <System.ComponentModel.Description("Gets/Sets if the keys in the items are unique.")> _
    Public Property KeysAreUnique() As Boolean
        Get
            Return uniqueKeys
        End Get
        Set(ByVal value As Boolean)
            uniqueKeys = value
        End Set
    End Property

    Private value As List(Of TValue)
    Private ReadOnly Property Values() As List(Of TValue)
        Get
            Return value
        End Get
    End Property

#End Region

#Region "Methods"

    Private Sub ResetCount()
        pCount = key.Count

        itms.Clear()

        For i As Integer = 0 To key.Count - 1
            itms.Add(New KeyValuePair(Of TKey, TValue)(key(i), value(i)))
        Next
    End Sub

    Public Sub Add(ByVal pair As KeyValuePair(Of TKey, TValue))
        If uniqueKeys AndAlso key.Contains(pair.Key) Then
            Throw New ArgumentException("An item with the same key has already been added and the KeysAreUnique property is True.")
        Else
            key.Add(pair.Key)
            value.Add(pair.Value)
            Me.ResetCount()
        End If
    End Sub

    Public Sub AddRange(ByVal pairs() As KeyValuePair(Of TKey, TValue))
        If uniqueKeys Then

            For Each pair As KeyValuePair(Of TKey, TValue) In pairs
                If key.Contains(pair.Key) Then
                    Throw New ArgumentException("An item with the same key has already been added and the KeysAreUnique property is True.")
                Else
                    key.Add(pair.Key)
                    value.Add(pair.Value)
                End If
            Next

            Me.ResetCount()
        Else
            For Each pair As KeyValuePair(Of TKey, TValue) In pairs
                key.Add(pair.Key)
                value.Add(pair.Value)
            Next

            Me.ResetCount()
        End If
    End Sub

    Public Function GetItem(ByVal i As Integer) As KeyValuePair(Of TKey, TValue)
        Return itms.Item(i)
    End Function

    Public Sub Remove(ByVal key As TKey)
        If uniqueKeys Then

            Me.key.Remove(key)

        Else

            For i As Integer = Me.key.Count - 1 To 0 Step -1
                If Me.key(i).ToString = key.ToString Then
                    Me.key.RemoveAt(i)
                End If
            Next

        End If
    End Sub

    Public Sub Remove(ByVal pair As KeyValuePair(Of TKey, TValue))
        If uniqueKeys Then

            Me.key.Remove(pair.Key)
            Me.value.Remove(pair.Value)

        Else

            For i As Integer = Me.key.Count - 1 To 0 Step -1
                If Me.key(i).ToString = pair.Key.ToString Then
                    Me.key.RemoveAt(i)
                    Me.value.RemoveAt(i)
                End If
            Next

        End If

        Me.ResetCount()
    End Sub

    Public Sub RemoveAt(ByVal i As Integer)

        Me.key.RemoveAt(i)
        Me.value.RemoveAt(i)
        Me.ResetCount()

    End Sub

#End Region

#Region "New Constructor"

    Public Sub New()
        itms = New List(Of KeyValuePair(Of TKey, TValue))
        key = New List(Of TKey)
        uniqueKeys = True
        value = New List(Of TValue)
        Me.ResetCount()
    End Sub

#End Region

End Class

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