Reference problem

[Swandi Candra]

Hi all,

I got a strange problem with classes in vb.net and
hopefully someone can help me explain it.

I got a simple class project called BaseObjects, with the
following class, properties and methods

Public Class StaffBase
Private msFirstName As String
Private msLastName As String

Public Property FirstName() As String
Get
FirstName = msFirstName
End Get
Set(ByVal sFirstName As String)
msFirstName = sFirstName
End Set
End Property

Public Property LastName() As String
Get
LastName = msLastName
End Get
Set(ByVal sLastName As String)
msLastName = sLastName
End Set
End Property
End Class

Then, I created another class project called
BusinessObjects, where I added BaseObjects reference to it

Public Class Staff
Inherits BaseObjects.StaffBase

Public Sub AssignName(Byval sFirstName As String,
ByVal sLastName As String)
FirstName = sFirstName
LastName = sLastName
End Sub
End Class

Afterward, I created a new window application project as
the client (I added Staff reference to this new project)

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Dim oStaff As BusinessObjects.Staff

oStaff = New BusinessObjects.Staff()
oStaff.AssignName("first", "last")
MsgBox oStaff.FirstName
oStaff = Nothing
End Sub

However, when I tried to build it, I got an error saying

'Public Property FirstName() As String' is declared in
project 'BaseObjects.dll', which is not referenced by
project 'WindowsApplication1.exe'

My question is, why should I need a reference from
BaseObjects? I thought BaseObjects had been inherited to
BusinessObjects. Therefore, I only need BusinessObject's
reference.

Does anyone have a clue or explainations?

Thanks.
SC

PS: please delete the underscore to reply.

 

[Armin Zingler]

Hi all,

I got a strange problem with classes in vb.net and
hopefully someone can help me explain it.

I got a simple class project called BaseObjects, with the
following class, properties and methods

Public Class StaffBase
Private msFirstName As String
Private msLastName As String

Public Property FirstName() As String
Get
FirstName = msFirstName
End Get
Set(ByVal sFirstName As String)
msFirstName = sFirstName
End Set
End Property

Public Property LastName() As String
Get
LastName = msLastName
End Get
Set(ByVal sLastName As String)
msLastName = sLastName
End Set
End Property
End Class

Then, I created another class project called
BusinessObjects, where I added BaseObjects reference to it

Public Class Staff
Inherits BaseObjects.StaffBase

Public Sub AssignName(Byval sFirstName As String,
ByVal sLastName As String)
FirstName = sFirstName
LastName = sLastName
End Sub
End Class

Afterward, I created a new window application project as
the client (I added Staff reference to this new project)

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Dim oStaff As BusinessObjects.Staff

oStaff = New BusinessObjects.Staff()
oStaff.AssignName("first", "last")
MsgBox oStaff.FirstName
oStaff = Nothing
End Sub

However, when I tried to build it, I got an error saying

'Public Property FirstName() As String' is declared in
project 'BaseObjects.dll', which is not referenced by
project 'WindowsApplication1.exe'

My question is, why should I need a reference from
BaseObjects? I thought BaseObjects had been inherited to
BusinessObjects. Therefore, I only need BusinessObject's
reference.

Does anyone have a clue or explainations?

You also have to reference BaseObjects because it contains parts of the code
of the Staff class. In other words, the staff class is spread across two
libraries. One part is in the BaseObjects library, the other part in the
BusinessObjects library. You need both.