SunlightAggregationTerminal/Models/DataSource.cs

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
    {
        // 直接返回 List
        public static List<NotificationItem> _NotificationData = new List<NotificationItem>();
        public static List<NotificationItem> GetAllItems()
        {
            DataSet? data = AppModels.Select("select * from Notification Where Time > '" +           
                DateTime.Now.AddDays(-30).ToString("yyyy-MM-dd HH:mm:ss.fff") + "'");

            _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();
        }


    }
}