Question

How do I use the IList(Of T).Max function in my example below?

Dim myList as IList(Of Integer)

For x = 1 to 10
    myList.add(x)
Next

'Error: 'Max' is not a member of 'System.Collections.Generic.IList(Of Integer)'
MsgBox(myList.Max()) 

Answer 1

your code throws a System.NullReferenceException when calling myList.add because it has not been initialized. If you use List instead of IList as shown below it works.

Imports System.Collections.Generic
Module Module1
    Sub Main()

        Dim myList As New List(Of Integer)

        For x = 1 To 10
            myList.Add(x)
        Next

        MsgBox(myList.Max())

    End Sub
End Module

It works fine even if only System is imported in the project.