Question

how can I convert the following code from C# to VB without exposing “variable” as global variable.

private void SomeMethod(SomeType variable)
{
    this.SomeEvent+= delegate
    {
        if (variable == 1)
        {
           this.DoSomething();
        }
    }
    //here I have some other code
}

Answer 1

One possible solution

Private Sub SomeMethod(ByVal variable As Integer)
    AddHandler Me.SomeEvent,
        Sub()
            If (variable = 1) Then
                Me.DoSomething()
            End If
        End Sub
    Console.WriteLine("ciao")
End Sub

I just tried that and it works like a charm, so i don’t know why u say it doesnt 🙁 Visual studio 2010.

You can also do something like this

Private Sub SomeMethod(ByVal variable As Integer)
    Me.SomeEvent = DirectCast(Delegate.Combine(Me.SomeEvent, Sub()
        If (variable = 1) Then
            Me.DoSomething
        End If
    End Sub), MyDelegate)
    ...mycode
End Sub

Delegate.Combine have exactly the same effect as AddHandler.

I don’t have visual studio 2008 so I don’t know how to write that in VS2008, try the second solution, the first seems to work only on 2010.

If this doesn’t work you can try this out, more code to write:

Public Delegate Sub MyDelegate()

Public Class Class1

    Public Event SomeEvent As MyDelegate

    Private Class MyDelegateClass

        Public Owner As Class1
        Public Variable As Integer

        Public Sub Method()
            If (Variable = 1) Then
                Owner.DoSomething()
            End If
        End Sub

    End Class

    Private Sub SomeMethod(ByVal variable As Integer)

        Dim dc As New MyDelegateClass
        dc.Owner = Me
        dc.Variable = variable

        AddHandler Me.SomeEvent, AddressOf dc.Method
        Console.WriteLine("ciao")
    End Sub

    Public Sub DoSomething()
        Console.WriteLine("hello")
    End Sub

End Class

Visual studio syntactic sugar does something like this with anonymous delegate.