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POC# event inheritance
 

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    <p>I have this program:</p> <pre><code> class One { public delegate void del(object o); public event del SomethingChanged; int x; public int X { get { return x; } set { x = value; OnSomethingChanged(this); } } protected void OnSomethingChanged(object o) { if (SomethingChanged != null) SomethingChanged(o); } } class Two: One { public void ChangeSomething() { //if (SomethingChanged != null) // SomethingChanged(this); OnSomethingChanged(this); } } static void Main(string[] args) { One one = new One(); Console.WriteLine(one.X); one.SomethingChanged += new One.del(one_SomethingChanged); one.X = 5; } static void one_SomethingChanged(object o) { Console.WriteLine(((One)o).X); } </code></pre> <p>There are 2 classes - One and Two, Two is descendant of One. There is event declared in class One(SomethingChanged) and it is triggered by class One and class Two. But take a look at Two.ChangeSomething - it raises event by invoking base class's method. However if I try to invoke event using raw code like</p> <pre> if (SomethingChanged != null) SomethingChanged(this); </pre> <p>I'm getting compiler error saying</p> <pre> The event 'One.SomethingChanged' can only appear on the left hand side of += or -= (except when used from within the type 'eventstest.Program.One') </pre> <p>So I'm just curious why I can't use 'raw' code in class Two to raise event but when I invoke a corresponding function event gets raised?</p> <p>[EDIT] Found some clarification here: <a href="https://stackoverflow.com/questions/756237/c-raising-an-inherited-event">C#: Raising an inherited event</a></p>
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