Create custom wpf event

Question

i\'ve created an UserControl for Database connection where user input Username and Password for a connection. This UserControl is in a MainWindow.xaml

Now, in code behin

Answer 1

First create a public event in your class :

public event EventHandler SomethingChanged;

NB MyEventArgs is the type of object that will be passed with the event to subscribers. For this example it could be like this :

public class MyEventArgs{
    public String Prop1 {get; set;}
}

Next fire it as-is in your class :

SomethingChanged?.Invoke(this, new MyEventArgs() { Prop1="test" });

Finnally handle it like this :

private void OnSomethingChanged(object sender, MyEventArgs e)
{
    //TODO
}

NB You need to subscribe to the event in order to enter in the OnSometingChanged method. Subscribe like this :

myClass.SomethingChanged+=OnSomethingChanged;

Where myClass is an instance of the class where you define SomethingChanged