vb.net – 在子类中“覆盖”共享成员的方法

我创建了一个主类Model,它带有一个共享函数来获取数据集,例如Model.find().
现在我想创建继承主要Model-Class的类,例如用户单独的一个：UserModel.find()=> “SELECT * FROM users”.

我现在需要的是找到一种方法来告诉Class它应该使用哪个表.我想到了一个抽象的字符串“表”,它是每个“子模型”中的常量,但是如何实现它,因为它不可能覆盖共享成员？

提前致谢！

编辑：也许这会让我的意思更清楚一点：

Public Class Model
Public Shared _controller As Controller

Public Shared table As String
Protected Shared tableFields As String()
Shared reader As Npgsql.NpgsqlDataReader

Public Shared Function find()
    Dim a As ArrayList = New ArrayList

    'Test if the tablefields are already known to the class,if not,get them

    If tableFields Is Nothing Then
        getTableFields()
    End If

    Dim query As String = "SELECT " + String.Join(",",tableFields) + " FROM " + table
    reader = _controller.executeReader(query)
        While reader.Read
            o = New Model
            Dim v As New Hashtable
            For Each field In tableFields
                v(field) = reader(field)
            Next
            o.values = v
            a.Add(o)
        End While
        reader.Close()
        Return DirectCast(a.ToArray(GetType(Model)),Model())
End Function

Public values As Hashtable

Public Sub New()
End Sub

End Class

所以我想要一个共享方法,它找到所有数据库条目并返回一个自己类型的实例数组,例如模型().
这就是为什么我想保持find-method共享而不是绑定到实例.