Combining two list, only records with 1 specific unique property - vb.net

Question

I'm combining two lists in visual basic. These lists are of a custom object. The only record I want to combine, are the once with a property doesn't match with any other object in the list so far. I've got it running. However, the first list is just 1.247 records. The second list however, is just short of 27.000.000 records. The last time I successfully merged the two list with this restriction, it took over 5 hours.
Usually I code in C#. I've had a similar problem there once, and solved it with the any function. It worked perfectly and really fast. So as you can see in the code, I tried that here too. However it takes way too long.
Private Function combineLists(list As List(Of Record), childrenlist As List(Of Record)) As List(Of Record) 'list is about 1.250 entries, childrenlist about 27.000.000
For Each r As Record In childrenlist
Dim dublicate As Boolean = list.Any(Function(record) record.materiaalnummerInfo = r.materiaalnummerInfo)
If Not dublicate Then
list.Add(r)
End If
Next
Return list
End Function
The object Record looks like this ( I wasn't sure how to make a custom object in VB, and this looks bad, but it worked):
Public Class Record
Dim materiaalnummer As String
Dim type As String 'Config or prefered
Dim materiaalstatus As String
Dim children As New List(Of String)
Public Property materiaalnummerInfo()
Get
Return materiaalnummer
End Get
Set(value)
materiaalnummer = value
End Set
End Property
Public Property typeInfo()
Get
Return type
End Get
Set(value)
type = value
End Set
End Property
Public Property materiaalstatusInfo()
Get
Return materiaalstatus
End Get
Set(value)
materiaalstatus = value
End Set
End Property
Public Property childrenInfo()
Get
Return children
End Get
Set(value)
children = value
End Set
End Property
End Class
I was hoping that someone could point me in the right direction to shorten the time needed. Thank you in advance.

Answer 1

I'm not 100% sure what you want the output to be such as all differences or just ones from the larger list etc but I would definitely try do it with LINQ! Basically sql for vb.net data so would something similar to this:
Dim differenceQuery = list.Except(childrenlist)
Console.WriteLine("The following lines are in list but not childrenlist")
' Execute the query.
For Each name As String In differenceQuery
Console.WriteLine(name)
Next
Also side-note i would suggest not calling one of the lists "list" as it is bad practice and is a in use name on the vb.net system
EDIT
Please try this then let me know what results come back.
Private Function combineLists(list As List(Of Record), childrenlist As List(Of Record)) As List(Of Record) 'list is about 1.250 entries, childrenlist about 27.000.000
list.AddRange(childrenlist) 'combines both lists
Dim result = From v In list Select v.materiaalnummerInfo Distinct.ToList
'result hopefully may be a list with all distinct values.
End Function
Or Don't combine them if you dont want to.