Visual Basic 2015 Unleashed

Iterators with Try..Catch..Finally

Unlike Visual C#, in Visual Basic the Yield statement can be executed from within a Try statement of a Try..Catch..Finally block. The following code demonstrates how to rewrite the OddNumbers iterator function including error handling:

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Iterator Function OddNumbers(first As Integer,                  last As Integer) As IEnumerable(Of Integer)    Try        For number As Integer = first To last            If number Mod 2 <> 0 Then                'is odd                Yield number            End If        Next    Catch ex As Exception        Console.WriteLine(ex.Message)    Finally        Console.WriteLine("Loop completed.")    End TryEnd Function

As you can see, the Yield statement ...