'Re: [Mono-dev] inherited event'

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List:       mono-devel-list
Subject:    Re: [Mono-dev] inherited event
From:       David Mitchell <dmitchell () logos ! com>
Date:       2009-02-25 19:14:23
Message-ID: C5CAD88F.13A7%dmitchell () logos ! com
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        The reason that you cannot called inherited events is because the
syntax you use for OnBar is really syntactic sugar for something like this:

protected event OnBar
{
  add { _onBar = Delegate.Combine(_onBar, value); }
  remove { _onBar = Delegate.Remove(_onBar, value); }
}

private EventHandler _onBar;

Once you expand this, itšs easy to see that you canšt call _onBar in child
classes because itšs private. In most cases, this really does make sense,
but if you want different behavior, you can either explicitly define OnBar
in this way and make _onBar protected (or whatever), or you can provide a
protected method (RaiseBar?) that raises the event if OnBar is not null.

--Dave

[Attachment #5 (text/html)]

<HTML>
<HEAD>
<TITLE>RE: inherited event</TITLE>
</HEAD>
<BODY>
<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> \
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The reason that you cannot called inherited \
events is because the syntax you use for OnBar is really syntactic sugar for \
something like this:<BR> <BR>
protected event OnBar<BR>
{<BR>
&nbsp;&nbsp;add { _onBar = Delegate.Combine(_onBar, value); }<BR>
&nbsp;&nbsp;remove { _onBar = Delegate.Remove(_onBar, value); }<BR>
}<BR>
<BR>
private EventHandler _onBar;<BR>
<BR>
Once you expand this, it&#8217;s easy to see that you can&#8217;t call _onBar in \
child classes because it&#8217;s private. In most cases, this really does make sense, \
but if you want different behavior, you can either explicitly define OnBar in this \
way and make _onBar protected (or whatever), or you can provide a protected method \
(RaiseBar?) that raises the event if OnBar is not null.<BR> <BR>
--Dave</SPAN></FONT>
</BODY>
</HTML>

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