Question

我看不出我做错了什么。

IDE告诉我

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

“CaptureDevice”类看起来像这样：

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

我的班级'IVideoSource'看起来像这样：

Namespace VideoSource

    'IVideoSource interface'
    Public Interface IVideoSource

        Event NewFrame As CameraEventHandler

    End Interface

End Namespace

有人看到我出错的地方或可能遗失的地方吗？

非常感谢您的帮助！

Answer 1

在CaptureDevice课程中，请改为：

Public Event NewFrame As CameraEventHandler Implements IVideoSource.NewFrame

虽然C＃假定一个实现接口成员名称相同的公共成员作为实现，但VB.NET要求实现明确声明。

Answer 2

您需要添加Implements子句，例如：

Public Event NewFrame As CameraEventHandler Implements IVideoSource.NewFrame

VB.Net没有c＃的隐式接口实现。

VB.NET类实现事件

2 个答案: