Handling events

To use this recipe, you need the project from the previous recipe. It should contain the MainPage.xaml file with the added button.

To handle the Click event, you need to perform the following steps:

Generating the method for handling the event of the button being clicked causes a modification, which is automatically introduced in both the MainPage.xaml and MainPage.xaml.cs files.

In the first file, with the XAML code describing the UI of the page, the Click property is automatically added to the Button element. It specifies the name of the method that is called when the user clicks on the button. The exemplary code is as follows:

    <Page (...)> 
        <Grid (...)> 
            <Button  
             x:Name="button" 
             Content="Button" 
             HorizontalAlignment="Left" 
             Margin="164,242,0,0" 
             VerticalAlignment="Top" 
             Click="button_Click" /> 
        </Grid> 
    </Page> 

It is worth mentioning that the button_Click method must exist in the MainPage class (name set as x:Class in the Page element). This method is also automatically generated in the MainPage.xaml.cs file, as follows:

    private void button_Click(object sender, RoutedEventArgs e) { } 

The method has a name that contains the name of the button (button) as well as information about the kind of event (Click). It has two parameters:

To specify operations that should be performed after pressing the button, you just need to add suitable C# code as the body of the button_Click method.

This way of handling the button being pressed is not the only possible one. Later in the book, you will learn how to use the data binding mechanism together with commands and the MVVM design pattern to improve the solution.