Generic Beginner Question

Question

Are these two statuses equivalent?

Public Class Class2(Of X As Class1)
Public Class Class2(Of X As {Class1})

What does "new" mean?

Public Class Class2(Of X As {Class1, New})

Answer 1

Your first two statements are equivalent. Curly braces are about how to use a few common restrictions in VB.NET. In your case, even if there are brackets, there is only one limitation.

The keyword Newis a constraint that ensures that the type Thas a constructor that takes no parameters. Thus, your second definition guarantees that it Tis or inherits from Class1and has a constructor without parameters.

Answer 2

Read these links:

• Class Instruction Syntax
• Type List Description
• New Keyword Explanation