Hi

While working on a complex UI application in WPF I noticed that because I was using DataTemplates both the Xaml and the Code Behind got very messy, that is because if you need to implement some events in the code behind you basically “mix” code from the template and code from the Window, plus you cannot access the elements in the template from the code behind.

Let’s look at the following example:

Here is the code which defines a C# EventHandler, as written in the documentation, it represents the method that will handle an event that has no event data:

// Summary:
//     Represents the method that will handle an event that has no event data.
//
// Parameters:
//   sender:
//     The source of the event.
//
//   e:
//     An System.EventArgs that contains no event data.
[Serializable]
[ComVisible(true)]
public delegate void EventHandler(object sender, EventArgs e);

So after declaring a specific event:

private event EventHandler OnSomethingHappened;

We need to write a method to raise this event:

We all know the pattern to declare an event in C#, fairly easy, here is a remainder:
1: public class EventTest
2: {
3: public event EventHandler MyEvent;
[...]