eventbrokersimplifiedhandlermethods.html

---
layout: documentation 
title: EventBroker 
teaser: Decoupled eventing with automatic thread switching
navigation:
   - name: Overview
     link: eventbroker.html
   - name: Tutorial
     link: eventbrokertutorial.html	
   - name: Registration by Attribute
     link: eventbrokerregistrationbyattribute.html
   - name: Registration over Interface
     link: eventbrokerregistrationoverinterface.html
   - name: Registration by Registrar
     link: eventbrokerregistrationbyregistrar.html
   - name: Simplified Handler Methods
     link: eventbrokersimplifiedhandlermethods.html
   - name: Direct Interaction
     link: eventbrokerdirectinteraction.html
   - name: Handlers
     link: eventbrokerhandlers.html
   - name: Matchers
     link: eventbrokermatchers.html
   - name: Exception Handling
     link: eventbrokerexceptionhandling.html
   - name: Extensions
     link: eventbrokerextensions.html
   - name: Logging
     link: eventbrokerlogging.html
   - name: Testability
     link: eventbrokertestability.html
   - name: Tips and Tricks
     link: eventbrokertipsandtricks.html
   - name: Specifications
     link: eventbrokerspecifications.html		 
---
<h2>Simplified Handler Methods</h2>
<p>
Standard .Net event handler methods have a signature with a sender and an event args.
</p>
<p>
For example:
</p>
<script type="syntaxhighlighter" class="brush: csharp"><![CDATA[
public void HandleSomeEvent(object sender, SomeEventArgs eventArgs);
]]></script>

<h3>Omit <code>sender</code> Argument</h3>
<p>
Most of the times, the sender is not relevant to the handling method.
</p>
<p>
Therefore you can simplify the signature to:
</p>
<script type="syntaxhighlighter" class="brush: csharp"><![CDATA[
public void HandleSomeEvent(SomeEventArgs eventArgs);
]]></script>
<p>
The event broker will still call this handler method. It just omits the <code>sender</code> argument.
</p>

<h3>Automatically extract Generic Event Arguments</h3>
<p>
When using <code>EventArgs&lt;T&gt;</code>, you can omit the <code>EventArgs</code>, too.
</p>
<p>
Instead of
</p>
<script type="syntaxhighlighter" class="brush: csharp"><![CDATA[
public void HandleSomeEvent(EventArgs<string> eventArgs);
]]></script>
<p>
you can write
</p>
<script type="syntaxhighlighter" class="brush: csharp"><![CDATA[
public void HandleSomeEvent(string value);
]]></script>
<p>

<p>
<i>Note</i> that this works only with the <code>Appccelerate.EventArgs&lt;T&gt;</code>.
But we have plans to allow custom extractors to be registered in the future.
</p>