l2as.cls

这个例程及文档详细地介绍了VB6中的物件导向概念

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "CL2As"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_Ext_KEY = "SavedWithClassBuilder6" ,"Yes"
Attribute VB_Ext_KEY = "Collection" ,"CL2A"
Attribute VB_Ext_KEY = "Member0" ,"CL2A"
Attribute VB_Ext_KEY = "Top_Level" ,"Yes"
Option Explicit

'local variable to hold collection
Private mCol As Collection

Public Function Insert(ByRef oCL2A As CL2A, Optional ByRef sKey As String = vbNullString)

    If Len(sKey) > 0 Then
        mCol.Add oCL2A, sKey
    Else
        mCol.Add oCL2A
    End If
    
End Function



Public Function Add(L3B As CL3B, L3A As CL3A, L2AProperty2 As String, L2AProperty1 As Long, Optional sKey As String) As CL2A
    'create a new object
    Dim objNewMember As CL2A
    Set objNewMember = New CL2A


    'set the properties passed into the method
        objNewMember.L3B = L3B
    
        objNewMember.L3A = L3A
    
    objNewMember.L2AProperty2 = L2AProperty2
    objNewMember.L2AProperty1 = L2AProperty1
    If Len(sKey) = 0 Then
        mCol.Add objNewMember
    Else
        mCol.Add objNewMember, sKey
    End If


    'return the object created
    Set Add = objNewMember
    Set objNewMember = Nothing


End Function

Public Property Get Item(vntIndexKey As Variant) As CL2A
Attribute Item.VB_UserMemId = 0
    'used when referencing an element in the collection
    'vntIndexKey contains either the Index or Key to the collection,
    'this is why it is declared as a Variant
    'Syntax: Set foo = x.Item(xyz) or Set foo = x.Item(5)
  Set Item = mCol(vntIndexKey)
End Property



Public Property Get Count() As Long
    'used when retrieving the number of elements in the
    'collection. Syntax: Debug.Print x.Count
    Count = mCol.Count
End Property


Public Sub Remove(vntIndexKey As Variant)
    'used when removing an element from the collection
    'vntIndexKey contains either the Index or Key, which is why
    'it is declared as a Variant
    'Syntax: x.Remove(xyz)


    mCol.Remove vntIndexKey
End Sub


Public Property Get NewEnum() As IUnknown
Attribute NewEnum.VB_UserMemId = -4
Attribute NewEnum.VB_MemberFlags = "40"
    'this property allows you to enumerate
    'this collection with the For...Each syntax
    Set NewEnum = mCol.[_NewEnum]
End Property


Private Sub Class_Initialize()
    'creates the collection when this class is created
    Set mCol = New Collection
End Sub


Private Sub Class_Terminate()
    'destroys collection when this class is terminated
    Set mCol = Nothing
End Sub