Converting a c# snippet to vb .net (re EventHandler)

Question

I've been out of the loop for a while and now doing some coding again.

I'm having trouble convert a particular c# snippet to vb .net. Any help would be appreciated:

public Form1()
{
    // Add a listener for usb events
    myUsbDevice.usbEvent += new usbDevice.usbEventsHandler(usbEvent_receiver);
}

private void usbEvent_receiver(object o, EventArgs e)
{
    // Do Stuff
}

Relevant bits are:

// usbDevice Class        
public delegate void usbEventsHandler(object sender, EventArgs e);
public event usbEventsHandler usbEvent;

My conversion is this:

// usbDevice Class
Public Delegate Sub usbEventsHandler(sender As Object, e As EventArgs)
Public Event usbEvent As usbEventsHandler

& this this what doesn't work (obviously):

Private Sub Form1()
    myUsbDevice.usbEvent += New usbDevice.usbEventsHandler(AddressOf usbEvent_receiver)  // this doesn't work. Says to use RaiseEvent although I think it should just be an AddHandler
End Sub

Private Sub usbEvent_receiver(o As Object, e As EventArgs)
    // Do stuff
End Sub

I'm just not quite sure how to convert it. Just using AddHandler doesn't seem to make sense and won't either:

AddHandler myUsbDevice.usbEvent, Sub usbEvent_receiver() // am missing 'o' object and 'e' eventargs + the whole usbDevice.usbEventsHandler bit is gone and I don't think/know whether that's right.

crthompson · Accepted Answer · 2014-06-18 14:41:40Z

1

The += in c# in this case is assigning an event handler.

To do this in VB it would look like:

AddHandler myUsbDevice.usbEvent, AddressOf usbEvent_receiver

The o of object and e of eventargs are passed without having to name them explicitly.

You have already set up the signature properly of usbEvent_receiver. VB will do the rest to pass the parameters.

edited Jun 18, 2014 at 14:41

answered Jun 18, 2014 at 14:31

crthompson

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