添加项目文件。

Main.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace ShanghaiEnvironmentalTechnology
+{
+    /// <summary>
+    /// Main.xaml 的交互逻辑
+    /// </summary>
+    public partial class Main : Window
+    {
+        public Main()
+        {
+            InitializeComponent();
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            string imagePath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resources/sleep2.jpg");
+            ImageBrush brush = new ImageBrush();
+            brush.ImageSource = new BitmapImage(new Uri(imagePath, UriKind.Absolute));
+            this.Background = brush;
+        }
+
+        /// <summary>
+        /// 进入主窗体事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+
+            MainWindow mainWindow = MainWindow.Instance;
+            mainWindow.ShowDialog(); // 显示 MainWindow
+
+
+            this.Close(); // 如果您希望在打开新窗口时关闭当前窗口
+        }
+    }
+}