VB.NET Class implements event

Question

I don't see what I did wrong.

The IDE tells me

 "Class 'CaptureDevice' needs to implement event 'Event NewFrame(sender As Object, e As CameraEventArgs) for 'IVideoSource'.

The class 'CaptureDevice' looks like this:

Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.IO
Imports System.Threading
Imports System.Runtime.InteropServices
Imports System.Net
Imports dshow
Imports dshow.Core

Namespace VideoSource

    Public Class CaptureDevice
        Implements IVideoSource
        Private source As String
        Private m_userData As Object = Nothing
        Private m_framesReceived As Integer

        Private thread As Thread = Nothing
        Private stopEvent As ManualResetEvent = Nothing

        ' new frame event '
        Public Event NewFrame As CameraEventHandler

        '(...)'
    End Class
End Namespace

My class 'IVideoSource' looks like this:

Namespace VideoSource

    'IVideoSource interface'
    Public Interface IVideoSource

        Event NewFrame As CameraEventHandler

    End Interface

End Namespace

Does anybody see where I went wrong or what may be missing?

Thank you very much for the help!

Answer 1

In your CaptureDevice class, do this instead:

Public Event NewFrame As CameraEventHandler Implements IVideoSource.NewFrame

While C# assumes a public member with the same name of an implemented interface's member to be the implementation, VB.NET requires that implementations are declared explicitely.

Answer 2

You need to add the Implements clause, so, something like:

Public Event NewFrame As CameraEventHandler Implements IVideoSource.NewFrame

VB.Net does not have c#'s implicit interface implementation.