List(OF T).Contains Problem (Search through String or Integer Props of the Class) - vb.net

Question

List(Of T).Contains function help.
Here is my simple object.
Public Class Person
Name as string
Age as Integer
End Class
In the Sub:
Dim Person as new Person
Person.Name = "John"
Person.Age = 32
Dim myPersonList as new List(of Person)
myPersonList.Add(Person)
How would I exactly look up if the List Contains a person named "John" with the myPersonList.Contains() function, Or how would i look up myPersonListContains(AGE)???. I can't neccessarily put "John" or an Age because the Contains function is asking for the Person Class, and not the string "John". I'd like to use this method instead of writing a function that iterates through every Persons "Name"

Answer 1

I used the Find method of List(Of T). I made your Name and Age in the Person class real Properties.
Public Class Person
Public Property Name As String
Public Property Age As Integer
End Class
Private Sub OPCode()
Dim myPersonList As New List(Of Person)
Dim p1 As New Person
p1.Name = "John"
p1.Age = 32
myPersonList.Add(p1)
Dim p2 As New Person
p2.Name = "Mathew"
p2.Age = 73
myPersonList.Add(p2)
Dim p3 As New Person
p3.Name = "Mark"
p3.Age = 90
myPersonList.Add(p3)
Dim foundInList = myPersonList.Find(Function(x) x.Name = "John")
If foundInList Is Nothing Then
MessageBox.Show("John not found")
Else
Dim JohnsAgeIs = foundInList.Age
Debug.Print(JohnsAgeIs.ToString)
'32 appears in Immediate window
End If
End Sub
Corrected per comment by #jmcilhinney. Without checking first if a person was returned by .Find a NRE could occur.

Answer 2

Unless your item type implements IEquatable(Of T), Contains will only check for reference equality. If you do implement IEquatable(Of Person) in the Person class, that implementation will be specific and unchanging, so you still can't compare in different ways at different times. What you should do is use the LINQ Any method instead, e.g.
If myPersonList.Any(Function(p) p.Name = "John") Then
'...
End If
If myPersonList.Any(Function(p) p.Age = 32) Then
'...
End If