在窗体上画一个名称为Drive1的驱动器列表框,一个名称为Dir1的目录列表框,一个名称为File1的文件列表框,两个名称分虽为Lahel1、Label2,标题分别为空白和 '共有文件'的标签。编写程序,使得驱动器列表框与目录列表框、目录列表框与文件列表框同步变化,并且在标签Label1中显示当前文件夹中文件的数量。如图所示。 能够正确实现上述功能的程序是
A.
Private Sub Dir1_Change( ) Filet.Path=Dir1.Path End Sub Private Sub Dive1_Change( ) Dir1.Path=Drive1.Drive Label1,Caption=File1 ListCount End Sub
B.
Private Sub Dir1_Change( ) File.Path=Dtr1.Path End Sub privage Sub Dive1_Change( ) Dir1.path=Drive1.Drive Lahel1.Caption=File1.List End Sub
C.
Private Sub Dir1_Change( ) File1. Path = Dirl.Path Label1.Caption=File1, ListCount End Sub Private Sub Drive1_Change( ) Dir1.Path = Drive1. Drive Label1.Captiol1 = File1.ListCount End Sub(
D.
Private Sub Dir1_Change( ) Filel. Path = Dirl.Path Label1.Caption = File1.ListCount End Sub Private Sub Dive1_Change( ) Dir1.Path = Drive1.Drive Label1.Caption = File1.List End Sub