Create an Object from a list of Objects. Is it Possible?

Question

User1588557281 posted

Hello, beeing new, I apologize, if my words are not very clear

My Question:

within VB.Net I create a class "Brett" (for tests very simple. the class contains only a property "length").

now it is possible, to gather the objects in a list of objects Brett with "Private Dim row As New List(Of Brett)". This works with row.add( ... ) o.k

Now the objects Brett in each row may have different length and in each row may have a different number of entries . works.

BUT:

now I would like to have a class  "clsROW" (not a list of object like above).

So, is it possible, to declare and use a class clsROW with property "row" as above, says with a propety .....List(of ?

Reason: I would like to gather the rows again in a "Private Dim room As New List(Of row)"

(if this works, I surely would try to make a class clsROOM to gahter the rows within room)

I can write the program without this clsROW and so on, but trying tu understand objects within VB.net (objects at all :-) ), I would prefer to consequently use objects, where possible

Now I add the code snippets and additional explanation (Sam - MSFT in Visual Basic .NET     asked for)

So about code, I try to explain in detail here.

First Class:

Public Class Brett3
    Public Sub New(ByVal Laenge As Integer) 
        Me.Laenge = Laenge   ' Me.    ist wichtig und richtig !!
    End Sub
    Private m_laenge As Integer
    Public Property Laenge() As Integer 
        Get
            Return m_laenge 
        End Get
        Set(ByVal value As Integer)
            m_laenge = value
        End Set
    End Property

End Class

 

in MAIN.vb 

     Private Dim Reihe3 As New List(Of Brett3)

.

         Reihe3.Add(New Brett3(nr)) 

.

This works fine with retrieving       

       dim Brettget as Brett3

      Brettget = Reihe(i)

     i = Brettget.Laenge

 

Now I would like to gather this collection Reihe3 as a list of objects too.

I tried:

Public Class ReiheofBrett
    Public Sub New(ByVal Reihe As List(Of Brett3) )
        Me.Reihe = New List(Of Brett3)
    End Sub
    
    Private m_reihe  As List(Of Brett3)
    Public Property Reihe() As List(Of Brett3)  
        Get
            Return m_reihe 
        End Get
        Set(ByVal value As List(Of Brett3) )
            m_reihe = value
        End Set
    End Property
End Class

 

now in Main.vb:

 

         Dim Reihex As ReiheofBrett

         Reihex = New ReiheofBrett(Reihe3)

 

this Reihex =   will occur several times, each time the collection "reihe3" contains a differnt number of entries

 

Compiler accepts, program works

       so, Reihex should contain the collection "Reihe3"   ?? or, what is wrong?

       and doing it several times, there should exist several different objects of class ReiheofBrett  ? (isn't)?

 

BUT, later, i am not able to retrieve the collection to a variable like Reihe3 again

 

I tried:

         Dim Reiheget As ReiheofBrett

         For each ReiheofBrett In Reiheget  (or for each Reihe in Reiheget)

 

or for i = 0 to n

       Reiheget = ReiheofBrett(i)

 

Question now:

Is it possible, to gather these objets "Reihe3" in ReiheofBrett (seems so)

But: How do I get back these objects  out of ReiheofBrett 

 

Thanks for your answer, but to gather the list of objects was o.k (see Reihe3 obove)

May be, it helps, if I shortly describe, what i am doing:

 class Brett3 is a plank of laminate/parquet

first plank and last plank in a row (Reihe3) have different length

I compute the number of planks and different lenths and gather the collection. NOW, a row contains several planks.

for a room, i need a lot of rows.

Similar, as a row contains planks, the room contains rows, which I try to create as object, too

 

For sure, I could write my program without a class/object row (and i just did it). But I try to learn, how to di it consequently object oriented