添加项目文件。

App.xaml.cs

@@ -0,0 +1,40 @@
+using System;
+using System.IO;
+using System.Windows;
+using MembranePoreTester.Communication;
+using Microsoft.Extensions.Configuration;
+
+namespace MembranePoreTester
+{
+    public partial class App : Application
+    {
+        public static IPlcService PlcService { get; private set; }
+        public static PlcConfiguration PlcConfig { get; private set; }
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+
+            using var db = new AppDbContext();
+            db.Database.EnsureCreated(); // 自动建表
+
+            var builder = new ConfigurationBuilder()
+                .SetBasePath(Directory.GetCurrentDirectory())
+                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
+
+            var configuration = builder.Build();
+            PlcConfig = configuration.GetSection("PlcSettings").Get<PlcConfiguration>();
+
+            if (PlcConfig == null)
+                throw new InvalidOperationException("PLC settings missing in appsettings.json");
+
+            PlcService = new ModbusTcpPlcService(PlcConfig);
+        }
+
+        protected override void OnExit(ExitEventArgs e)
+        {
+            (PlcService as IDisposable)?.Dispose();
+            base.OnExit(e);
+        }
+    }
+}