20211124_ZNZT_upperpc/MonitoringTechnology/ViewModels/FirstPageViewModel.cs

using MonitoringTechnology.Common;
using MonitoringTechnology.DataAccess;
using MonitoringTechnology.Models;
using MonitoringTechnology.Views;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace MonitoringTechnology.ViewModels
{
    /// <summary>
    /// 系统监控
    /// </summary>
    public class FirstPageViewModel
    {

        public DBHelper dbHelper = new DBHelper();


        public ObservableCollection<ElectricalEnvironmentalModel> ElectricalEnvironmentalList { get; set; } = new ObservableCollection<ElectricalEnvironmentalModel>();
        public ObservableCollection<AlarmItemModel> AlarmItemModelList { get; set; } = new ObservableCollection<AlarmItemModel>();


        public FirstPageViewModel()
        {
            ///初始化消息列表
            ///查询数据库最新的30条数据，如果没有则临时新增一条
            var Query_monitoringSensorModelsList = dbHelper.Query_monitoringSensorModelsList();
            if (Query_monitoringSensorModelsList.Count == 0)
            {
                ElectricalEnvironmentalList.Add(new ElectricalEnvironmentalModel
                {
                    F_SerialNo = 01,
                    F_CreateDate = DateTime.Now,
                    F_DatetimeSensor = DateTime.Now,
                    F_Tem = 35,
                    F_Hum = 20,
                    F_Pressure = 101
                });
            }
            else
            {
                ElectricalEnvironmentalList = Query_monitoringSensorModelsList;
            }

            //查询数据库最新的30条数据，如果没有则临时新增一条
            var Query_AlarmItemModellist = dbHelper.Query_AlarmItemModelList();
            if (Query_AlarmItemModellist.Count == 0)
            {
                AlarmItemModelList.Add(new AlarmItemModel
                {
                    _SerialNo = 01,
                    message = "电压故障",
                    time = DateTime.Now,
                    len = 5
                });
            }
            else
            {
                //数据库中存在数据，则将查询的结果赋值给AlarmList
                AlarmItemModelList = Query_AlarmItemModellist;
            }
        }
    }
}