在C#编码的事件情况下,前缀“On”的实现是什么？

在MSDN文章“处理和提升事件”https://msdn.microsoft.com/en-us/library/edzehd2t(v=vs.110).aspx中,它说,

Typically,to raise an event,you add a method that is marked as
protected and virtual (in C#) or Protected and Overridable (in Visual
Basic). Name this method OnEventName; for example,OnDataReceived. The
method should take one parameter that specifies an event data object.
You provide this method to enable derived classes to override the
logic for raising the event. A derived class should always call the
OnEventName method of the base class to ensure that registered
delegates receive the event.

指示On …方法是引发事件.但是,在许多编码样本中,甚至是Microsoft提供的一些代码样本中,我们可以看到事件On方法用作事件处理程序,就像在这里https://msdn.microsoft.com/en-us/windows/uwp/gaming/tutorial–adding-move-look-controls-to-your-directx-game?f=255&MSPPError=-2147217396

First,let’s populate the mouse and touch pointer event handlers. In
the first event handler,OnPointerPressed(),we get the x-y
coordinates of the pointer from the CoreWindow that manages our
display when the user clicks the mouse or touches the screen in the
look controller region.

void MoveLookController::OnPointerPressed(
_In_ CoreWindow^ sender,_In_ PointerEventArgs^ args)
{
    // Get the current pointer position.
    uint32 pointerID = args->CurrentPoint->PointerId;
    DirectX::XMFLOAT2 position = DirectX::XMFLOAT2( args->CurrentPoint->Position.X,args->CurrentPoint->Position.Y );

    auto device = args->CurrentPoint->PointerDevice;
    auto deviceType = device->PointerDeviceType;
    if ( deviceType == PointerDeviceType::Mouse )
    {
        // Action,Jump,or Fire
    }

    // Check  if this pointer is in the move control.
    // Change the values  to percentages of the preferred screen resolution.
    // You can set the x value to <preferred resolution> * <percentage of width>
    // for example,( position.x < (screenResolution.x * 0.15) ).

    if (( position.x < 300 && position.y > 380 ) && ( deviceType != PointerDeviceType::Mouse ))
    {
        if ( !m_moveInUse ) // if no pointer is in this control yet
        {
            // Process a DPad touch down event.
            m_moveFirstDown = position;                 // Save the location of the initial contact.
            m_movePointerPosition = position;
            m_movePointerID = pointerID;                // Store the id of the pointer using this control.
            m_moveInUse = TRUE;
        }
    }
    else // This pointer must be in the look control.
    {
        if ( !m_lookInUse ) // If no pointer is in this control yet...
        {
            m_lookLastPoint = position;                         // save the point for later move
            m_lookPointerID = args->CurrentPoint->PointerId;  // store the id of pointer using this control
            m_lookLastDelta.x = m_lookLastDelta.y = 0;          // these are for smoothing
            m_lookInUse = TRUE;
        }
    }
}

我的问题是：

>对于“On”前缀的使用确实存在这样的模糊性,还是仅仅是我的误解？在提升和处理事件方法时,人们真的使用“On”吗？
>实施方法提升和处理事件的标准方式是什么？什么是流行的风格？你建议的风格是什么？