添加项目文件。

Models/AppModels.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using SunlightAggregationTerminal.Class;
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Text;
+
+namespace SunlightAggregationTerminal.Models
+{
+    public class AppModels : ObservableObject
+    {
+        
+        public static SqliteHelper sqliteHelper = SQLiteConfig.Config(Path.Combine(FileSystem.AppDataDirectory, "MyAppData.db"))!; //数据库连接路径(获取各平台的应用数据目录)
+
+        public AppModels()
+        {         
+            if(sqliteHelper != null)
+            {//获取配置信息
+                sqliteHelper.Open();
+                var userdata= sqliteHelper.ExecuteDataSet("select * from Users Where LogNo = 1", null);
+                sqliteHelper.Close();
+                if (userdata != null)
+                {
+                    var dat = userdata.Tables[0].AsEnumerable().FirstOrDefault();
+                    if (dat != null)
+                    {
+                        App.GlobalData.UserName = dat.Field<string>("UserName") ?? "";
+                        App.GlobalData.UserId = dat.Field<string>("UserId") ?? "";
+                        App.GlobalData.User = dat.Field<string>("User") ?? "";
+                        App.GlobalData.UserPassword = dat.Field<string>("UserPassword") ?? "";
+                        App.GlobalData.Enterprise = dat.Field<string>("Enterprise") ?? "";
+                        App.GlobalData.Department = dat.Field<string>("Department") ?? "";
+                        App.GlobalData.Groups = dat.Field<string>("Groups") ?? "";
+                        App.GlobalData.ServerID = dat.Field<string>("ServerID") ?? "";
+                        App.GlobalData.ProxyID = dat.Field<string>("ProxyID") ?? "";
+                        App.GlobalData.LogNo = Convert.ToBoolean(dat.Field<object>("LogNo"));
+                        App.GlobalData.LocalAreaNetworkMode = Convert.ToBoolean(dat.Field<object>("LocalAreaNetworkMode"));
+                        App.GlobalData.DarkMode = Convert.ToBoolean(dat.Field<object>("DarkMode"));
+                        App.GlobalData.MessageNotificationMode = Convert.ToBoolean(dat.Field<object>("MessageNotificationMode"));
+
+                        TcpServer.Configuration(App.GlobalData.ServerID, App.GlobalData.User, App.GlobalData.UserPassword, dat.Field<string>("GUID") ?? "Not");
+                    }
+                }
+            }           
+        }
+
+        public static void Updata(string sql) 
+        {
+            sqliteHelper.Open();
+            sqliteHelper.ExecuteNonQuery(sql, null);
+            sqliteHelper.Close();
+        }
+
+        public static void INSERT(string sql)
+        {
+            sqliteHelper.Open();
+            sqliteHelper.ExecuteNonQuery(sql, null);
+            sqliteHelper.Close();
+        }
+
+        public static DataSet? Select(string sql)
+        {
+            sqliteHelper.Open();
+            var userdata = sqliteHelper.ExecuteDataSet(sql, null);
+            sqliteHelper.Close();
+
+            return userdata;
+        }
+
+        public static string GetAppUniqueId()
+        {
+            const string key = "sunlight_app_unique_id";
+
+            // 尝试从安全存储中读取
+            string? id = SecureStorage.GetAsync(key).Result;
+
+            if (string.IsNullOrEmpty(id))
+            {
+                // 如果不存在，生成一个新的 GUID
+                id = Guid.NewGuid().ToString();
+                // 保存到安全存储
+                SecureStorage.SetAsync(key, id).Wait();
+            }
+
+            return id;
+        }
+
+    }
+}

Models/DataModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SunlightAggregationTerminal.Models
+{
+#pragma warning disable CA1416
+    public partial class DataModel : ObservableObject
+    {
+        [ObservableProperty]
+        public partial string User { get; set; }
+        [ObservableProperty]
+        public partial string UserId { get; set; }
+        [ObservableProperty]
+        public partial string UserName { get; set; }
+        [ObservableProperty]
+        public partial string UserPassword { get; set; }
+        [ObservableProperty]
+        public partial string Enterprise { get; set; }
+        [ObservableProperty]
+        public partial string Department { get; set; }
+        [ObservableProperty]
+        public partial string ServerID { get; set; }
+        [ObservableProperty]
+        public partial string Groups { get; set; }
+        [ObservableProperty]
+        public partial string ProxyID { get; set; }
+        [ObservableProperty]
+        public partial bool LogNo { get; set; }
+        public bool IsNotLogNo => !LogNo;
+        [ObservableProperty]
+        public partial bool LocalAreaNetworkMode { get; set; }
+        [ObservableProperty]
+        public partial bool DarkMode { get; set; }
+        [ObservableProperty]
+        public partial bool MessageNotificationMode { get; set; }
+
+    }
+}

Models/DataSource.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Text;
+using System.Linq;
+
+namespace SunlightAggregationTerminal.Models
+{
+    // 定义枚举
+    public enum MsgType
+    {
+        Notice, // 通知
+        Message, // 信息
+        System  // 系统
+    }
+
+    // 定义显示用的模型
+    public class NotificationItem
+    {
+        public Int64 Id { get; set; }
+        public string? Title { get; set; }
+        public string? Content { get; set; }
+        public DateTime Time { get; set; }
+        public MsgType Type { get; set; }
+    }
+
+    public static class DataService
+    {
+        public static DataSet? data = AppModels.Select("select * from Notification Where Time > '" + DateTime.Now.AddDays(-30) + "'");
+
+        // 直接返回 List
+        public static List<NotificationItem> _NotificationData = new List<NotificationItem>();
+        public static List<NotificationItem> GetAllItems()
+        {
+            _NotificationData.Clear();
+
+            if (data != null)
+            {
+                foreach (DataRow dr in data.Tables[0].Rows)
+                {
+                    _NotificationData.Add(new NotificationItem
+                    {
+                        Id = dr.Field<Int64>("Id"),
+                        Title = dr.Field<string>("Title") ,
+                        Content = dr.Field<string>("Content"),
+                        Time = DateTime.Parse(dr.Field<string>("Time")!),
+                        Type = (MsgType)dr.Field<Int64>("Type")
+                    });
+                }
+            }
+
+            // 倒序返回
+            return _NotificationData.OrderByDescending(x => x.Time).ToList();
+        }
+
+
+    }
+}