how to make a deep copy of my list

Question

 Dim i = 2
    Do While True
        i += 1
        If IsDBNull(TmDataSet.T.Rows(0)(i)) = True Then Exit Do
        Dim new_t As New train
        new_t.id = TmDataS         


        

Answer 1

You can create an extension method where you serialize the object only to deserialize it again. This will create a new object with it's own references, thus a Deep Copy.

Public Module Extensions
    <System.Runtime.CompilerServices.Extension()> _
    Public Function DeepCopy(Of T)(ByVal Obj As T) As T
        If Obj.GetType().IsSerializable = False Then Return Nothing

        Using MStream As New MemoryStream
            Dim Formatter As New BinaryFormatter
            Formatter.Serialize(MStream, Obj)
            MStream.Position = 0
            Return DirectCast(Formatter.Deserialize(MStream), T)
        End Using
    End Function
End Module

Now you can just call:

Dim network As List(Of train) = per_network.DeepCopy()

EDIT:

These are the required imports for my code above:

Imports System.IO
Imports System.Runtime.Serialization.Formatters.Binary

Answer 2

This is the code I used

Dim deepCopies = _dictOfBalances1.Keys.ToList

Basically deepCopies is a deep copy of _dictOfBalances1.Keys

This code won't work if deepCopies are shallow copies.

For Each code In deepCopies
    If allthecoincode.Contains(code) Then
    Else
        _dictOfBalances1.Remove(code)
        'deletedKeys.Add(code)
    End If
Next