VideoConcat/MainWindow.xaml.cs

using System.Windows;
using System.Windows.Input;

namespace VideoConcat
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void BtnExit_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (Mouse.LeftButton == MouseButtonState.Pressed)
            {
                this.DragMove();
            }
        }

        private void BtnLogin_Click(object sender, RoutedEventArgs e)
        {
    Video video = new();
                video.Show();

                this.Close();
                return;
            if (txtUserName.Text == "admin" && txtPassword.Password == "&o4Fwag3xYUf")
            {
            
            }

            MessageBox.Show("用户名或者密码错误！");
            txtUserName.Clear();
            txtPassword.Clear();
        }
    }
}