Generic Class Vb.net
- by KoolKabin
hi guys,
I am stuck with a problem about generic classes. I am confused how I call the constructor with parameters.
My interface:
Public Interface IDBObject
Sub [Get](ByRef DataRow As DataRow)
Property UIN() As Integer
End Interface
My Child Class:
Public Class User
Implements IDBObject
Public Sub [Get](ByRef DataRow As System.Data.DataRow) Implements IDBObject.Get
End Sub
Public Property UIN() As Integer Implements IDBObject.UIN
Get
End Get
Set(ByVal value As Integer)
End Set
End Property
End Class
My Next Class:
Public Class Users
Inherits DBLayer(Of User)
#Region " Standard Methods "
#End Region
End Class
My DBObject Class:
Public Class DBLayer(Of DBObject As {New, IDBObject})
Public Shared Function GetData() As List(Of DBObject)
Dim QueryString As String = "SELECT * ***;"
Dim Dataset As DataSet = New DataSet()
Dim DataList As List(Of DBObject) = New List(Of DBObject)
Try
Dataset = Query(QueryString)
For Each DataRow As DataRow In Dataset.Tables(0).Rows
**DataList.Add(New DBObject(DataRow))**
Next
Catch ex As Exception
DataList = Nothing
End Try
Return DataList
End Function
End Class
I get error in the starred area of the DBLayer Object.
What might be the possible reason? what can I do to fix it?
I even want to add New(byval someval as datatype) in IDBObject interface for overloading construction. but it also gives an error? how can i do it?
Adding
Sub New(ByVal DataRow As DataRow) in IDBObject producess following error
'Sub New' cannot be declared in an interface.
Error Produced in DBLayer Object
line: DataList.Add(New DBObject(DataRow))
Msg: Arguments cannot be passed to a 'New' used on a type parameter.
