rspec/rules/S3906/rule.adoc

Delegate event handlers (i.e. delegates used as type of an event) should have a very specific signature:

* Return type `+void+`.
* First argument of type `+System.Object+` and named 'sender'.
* Second argument of type `+System.EventArgs+` (or any derived type) and is named 'e'.

This rule raises an issue whenever a `+delegate+` declaration doesn't match that signature.


== Noncompliant Code Example

----
public delegate void AlarmEventHandler(object s);

public class Foo
{
    public event AlarmEventHandler AlarmEvent; // Noncompliant
}
----


== Compliant Solution

----
public delegate void AlarmEventHandler(object sender, AlarmEventArgs e);

public class Foo
{
    public event AlarmEventHandler AlarmEvent; // Compliant
}
----


== See

https://msdn.microsoft.com/en-us/library/edzehd2t.aspx[Handling and Raising Events]