Question

I have

Dim objectsList as List(Of Object) = GetAllObjects()

' Filter from Objects just Persons '
Dim peopleList as List(Of Person) = ???

What is the most efficient and effective LINQ expression to do it?

EDIT

1 Dim selectedObjects As List(Of Object) = GetAllObjects()
2 Dim selectedPeople As IEnumerable(Of Person)= selectedObjects.OfType(Of Person)
3 Dim people As List(Of Person) = selectedPeople.ToList()

Error on 3:

Value of type
‘System.Collections.Generic.List(Of
System.Collections.Generic.IEnumerable(Of Person))’ cannot be
converted to
‘System.Collections.Generic.List(Of Person)’.

Answer 1

Sounds like you want Enumerable.OfType():

Dim peopleList as List(Of Person) = objectsList.OfType(Of Person)().ToList()