我想设置一个回调，该回调将在我的班上由另一个班提出：
Public Class CameraWindow
Inherits System.Windows.Forms.Control
Private m_camera As Camera = Nothing
' Camera property
<Browsable(False)> _
Public Property Camera() As Camera
Get
Return m_camera
End Get
Set(value As Camera)
' lock
Monitor.Enter(Me)
' detach event
If m_camera IsNot Nothing Then
m_camera.NewFrame -= New EventHandler(AddressOf camera_NewFrame)
timer.[Stop]()
End If
m_camera = value
needSizeUpdate = True
firstFrame = True
flash = 0
' atach event
If m_camera IsNot Nothing Then
m_camera.NewFrame += New EventHandler(AddressOf camera_NewFrame)
timer.Start()
End If
' unlock
Monitor.[Exit](Me)
End Set
End Property
' On new frame ready
Private Sub camera_NewFrame(sender As Object, e As System.EventArgs)
Invalidate()
End Sub
该事件在
Public Class Camera
Public Event NewFrame As EventHandler
但是VB.NET不喜欢我附加和分离事件的方式。有人可以告诉我如何正确执行吗？
非常感谢你的帮助！
看起来好像您通常在使用C＃。在VB.NET中，您可以使用以下AddHandler语句：
AddHandler m_camera.NewFrame, AddressOf camera_NewFrame
删除处理程序使用 RemoveHandler
RemoveHandler m_camera.NewFrame, AddressOf camera_NewFrame
但是，如果事件处理程序位于其他类中，则需要将其公开：
Public Sub camera_NewFrame(sender As Object, e As System.EventArgs)
Invalidate()
End Sub
并且您需要一个实例：
AddHandler Camera.NewFrame, AddressOf m_camera.camera_NewFrame
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