在 C# 中，您可以显式定义add/remove代码时event已订阅/取消订阅。
这在 VB.net 中可能吗？
Imports System.Runtime.CompilerServices
...
Private propchanged As PropertyChangedEventHandler
Public Custom Event PropertyChanged As PropertyChangedEventHandler
<MethodImpl(MethodImplOptions.Synchronized)> _
AddHandler(ByVal value As PropertyChangedEventHandler)
propchanged = DirectCast([Delegate].Combine(propchanged, value), PropertyChangedEventHandler)
End AddHandler
<MethodImpl(MethodImplOptions.Synchronized)> _
RemoveHandler(ByVal value As PropertyChangedEventHandler)
propchanged = DirectCast([Delegate].Remove(propchanged, value), PropertyChangedEventHandler)
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs)
Dim handler = propchanged
If handler IsNot Nothing Then handler(sender, e)
End RaiseEvent
End Event
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