WPF tutorial - Handling exceptions in WPF

예외처리 http://www.wpf-tutorial.com/wpf-application/handling-exceptions/

 <Grid>
        <Button Name="button" Click="Button_Click" Content="클릭!">
        </Button>
 </Grid>

public partial class MainWindow : Window 
    {
        public MainWindow()
        {
            InitializeComponent();
        }
 
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string s = null;
            s.Trim();
            Trim()(method)를 null값에 대하여 사용하려고 하여 에러 발생
        }
    }

private void Button_Click(object sender, RoutedEventArgs e)
        {
            string s = null;
            try
            {
                s.Trim();
            }
            catch (Exception ex)
            {
                MessageBox.Show("A handled exception just occurred: " + ex.Message, "Exception Sample", 
                예외가 발생한다면, 해당하는 메세지를 띄워라
                이때 title은 Exception Sample, button은 확인버튼, 이미지(아이콘)은 warning으로 해라.
                MessageBoxButton.OK, MessageBoxImage.Warning);
            }
        }

MainWindow.xaml.cs
 
 public partial class MainWindow : Window 
    {
        public MainWindow()
        {
            InitializeComponent();
        }
 
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string s = null;
 
            s.Trim();
        }
    }

App.xaml
 
<Application x:Class="WPF_tutorial.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WPF_tutorial"
             StartupUri="MainWindow.xaml"
             DispatcherUnhandledException="Application_DispatcherUnhandledException"
             >
    
    <Application.Resources>
    </Application.Resources>
</Application>

App.xaml.cs
 
 public partial class App : Application
    {
        private void Application_DispatcherUnhandledException(object sender,
            System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            MessageBox.Show("An unhandled exception just occurred: " + e.Exception.Message,
            "Exception Sample", MessageBoxButton.OK, MessageBoxImage.Warning);
            e.Handled = true;
        }
    }

App.xaml에서 예외를 전역적으로 처리할 수 있습니다.

이 작업 은 Application 클래스 의 DispatcherUnhandledException 이벤트를 통해 수행됩니다 .