事件处理C#和VB.NET之间的差异

public class EventHandlerExample
{
    public event EventHandler<CustomEventArgs> CustomEvent;

    protected virtual void OnCustomEvent(CustomEventArgs e)
    {
        CustomEvent?.Invoke(this, e);
    }
}

Public Class EventHandlerExample
    Public Event CustomEvent As EventHandler(Of CustomEventArgs)

    Protected Overridable Sub OnCustomEvent(e As CustomEventArgs)
        RaiseEvent CustomEvent(Me, e)
    End Sub
End Class

public class EventHandlerExample
{
    public event EventHandler<CustomEventArgs> CustomEvent;

    protected virtual void OnCustomEvent(CustomEventArgs e)
    {
        CustomEvent?.Invoke(this, e);
    }
}

public class CustomEventArgs : EventArgs
{
    public string Message { get; set; }
}

public class EventHandlerExampleUsage
{
    public EventHandlerExampleUsage()
    {
        EventHandlerExample example = new EventHandlerExample();
        example.CustomEvent += Example_CustomEvent;
    }

    private void Example_CustomEvent(object sender, CustomEventArgs e)
    {
        Console.WriteLine(e.Message);
    }
}

Public Class EventHandlerExample
    Public Event CustomEvent As EventHandler(Of CustomEventArgs)

    Protected Overridable Sub OnCustomEvent(e As CustomEventArgs)
        RaiseEvent CustomEvent(Me, e)
    End Sub
End Class

Public Class CustomEventArgs
    Inherits EventArgs

    Public Property Message As String
End Class

Public Class EventHandlerExampleUsage
    Public Sub New()
        Dim example As New EventHandlerExample()
        AddHandler example.CustomEvent, AddressOf Example_CustomEvent
    End Sub

    Private Sub Example_CustomEvent(sender As Object, e As CustomEventArgs)
        Console.WriteLine(e.Message)
    End Sub
End Class

public class EventHandlerExample
{
    public event EventHandler<CustomEventArgs> CustomEvent;

    protected virtual void OnCustomEvent(CustomEventArgs e)
    {
        CustomEvent?.Invoke(this, e);
    }

    public void TriggerEvent()
    {
        OnCustomEvent(new CustomEventArgs { Message = "Hello from C#!" });
    }
}

Public Class EventHandlerExample
    Public Event CustomEvent As EventHandler(Of CustomEventArgs)

    Protected Overridable Sub OnCustomEvent(e As CustomEventArgs)
        RaiseEvent CustomEvent(Me, e)
    End Sub

    Public Sub TriggerEvent()
        OnCustomEvent(New CustomEventArgs With {.Message = "Hello from VB.NET!"})
    End Sub
End Class