When a simple WPF program starts, the loaded method does not trigger, and the window displays a prompt indicating no response, followed by a crash

Sarzn 1

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Loaded="Window_Loaded"
        Unloaded="Window_Unloaded"
        Activated="Window_Activated"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        
    </Grid>
</Window>


namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            Console.WriteLine("create");
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            Console.WriteLine("loaded");
        }

        private void Window_Unloaded(object sender, RoutedEventArgs e)
        {
            Console.WriteLine("unloaded");
        }

        private void Window_Activated(object sender, EventArgs e)
        {
            Console.WriteLine("Activated");
        }
    }
}

Hui Liu-MSFT 47,341 Reputation points Microsoft Vendor

2023-10-16T09:41:39.3033333+00:00
Hi,@Sarzn. Welcome to Microsoft Q&A. I tried to break the Debug point, and the program executed the code of the Window_Loaded and Window_Activated methods.

In WPF applications, the Console.WriteLine method does not write directly to the Visual Studio Output window. It writes to the standard output stream, which is typically the console if the application is a console application.

I tested your source code program, and it didn't crash.

private void Window_Loaded(object sender, RoutedEventArgs e) { MessageBox.Show("loaded"); } private void Window_Unloaded(object sender, RoutedEventArgs e) { Console.WriteLine("unloaded"); } private void Window_Activated(object sender, EventArgs e) { MessageBox.Show("Activated"); }

What platform is your project targeting? What is your system environment? Or are there specific steps to reproduce the problem?

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When a simple WPF program starts, the loaded method does not trigger, and the window displays a prompt indicating no response, followed by a crash