DataServices 现场调试OK
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229
FATrace.WPLApp/ViewModels/HistoryAlarmViewModel.cs
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229
FATrace.WPLApp/ViewModels/HistoryAlarmViewModel.cs
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using FATrace.WPLApp.Core;
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using Prism.Commands;
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using System;
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using System.Collections.ObjectModel;
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using System.Threading.Tasks;
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using FreeSql;
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using FATrace.Model;
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using FATrace.WPLApp.Services;
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using System.Windows;
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using System.Linq;
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namespace FATrace.WPLApp.ViewModels
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{
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/// <summary>
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/// 历史报警查询 VM
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/// 支持按时间范围/类别/消息模糊查询，分页展示。
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/// </summary>
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public class HistoryAlarmViewModel : NavigationViewModel
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{
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private readonly IFreeSql _fsql;
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private readonly ILogService _log;
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public HistoryAlarmViewModel(IFreeSql fsql, ILogService log)
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{
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_fsql = fsql;
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_log = log;
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Items = new ObservableCollection<HistoryAlarm>();
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CategoryList = new ObservableCollection<string>();
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// 默认时间范围为今日
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StartTime = DateTime.Today;
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EndTime = DateTime.Today.AddDays(1).AddSeconds(-1);
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SearchCommand = new DelegateCommand(async () => await SearchAsync(), () => !IsBusy)
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.ObservesProperty(() => IsBusy);
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ClearCommand = new DelegateCommand(ClearFilters, () => !IsBusy)
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.ObservesProperty(() => IsBusy);
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FirstPageCommand = new DelegateCommand(async () => { if (PageIndex == 1) return; PageIndex = 1; await SearchAsync(); }, () => !IsBusy && PageIndex > 1)
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.ObservesProperty(() => IsBusy).ObservesProperty(() => PageIndex);
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PrevPageCommand = new DelegateCommand(async () => { if (PageIndex <= 1) return; PageIndex -= 1; await SearchAsync(); }, () => !IsBusy && PageIndex > 1)
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.ObservesProperty(() => IsBusy).ObservesProperty(() => PageIndex);
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NextPageCommand = new DelegateCommand(async () => { if (PageIndex >= TotalPages) return; PageIndex += 1; await SearchAsync(); }, () => !IsBusy && PageIndex < TotalPages)
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.ObservesProperty(() => IsBusy).ObservesProperty(() => PageIndex).ObservesProperty(() => TotalPages);
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LastPageCommand = new DelegateCommand(async () => { if (TotalPages <= 0 || PageIndex == TotalPages) return; PageIndex = TotalPages; await SearchAsync(); }, () => !IsBusy && PageIndex < TotalPages)
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.ObservesProperty(() => IsBusy).ObservesProperty(() => PageIndex).ObservesProperty(() => TotalPages);
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}
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#region 查询条件
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public string? Category { get => _category; set { _category = value; RaisePropertyChanged(); } }
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private string? _category;
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public ObservableCollection<string> CategoryList { get; }
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public string? Keyword { get => _keyword; set { _keyword = value; RaisePropertyChanged(); } }
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private string? _keyword;
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public DateTime? StartTime { get => _startTime; set { _startTime = value; RaisePropertyChanged(); } }
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private DateTime? _startTime;
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public DateTime? EndTime { get => _endTime; set { _endTime = value; RaisePropertyChanged(); } }
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private DateTime? _endTime;
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#endregion
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#region 列表/状态/分页
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public ObservableCollection<HistoryAlarm> Items { get; }
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private bool _isBusy;
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public bool IsBusy { get => _isBusy; set { _isBusy = value; RaisePropertyChanged(); } }
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private int _totalCount;
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public int TotalCount { get => _totalCount; set { _totalCount = value; RaisePropertyChanged(); } }
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private int _pageIndex = 1;
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public int PageIndex { get => _pageIndex; set { _pageIndex = value < 1 ? 1 : value; RaisePropertyChanged(); } }
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private int _pageSize = 20;
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public int PageSize
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{
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get => _pageSize;
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set
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{
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var newSize = value <= 0 ? 20 : value;
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if (_pageSize != newSize)
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{
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_pageSize = newSize;
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RaisePropertyChanged();
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PageIndex = 1;
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if (!IsBusy) _ = SearchAsync();
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}
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}
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}
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private int _totalPages;
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public int TotalPages { get => _totalPages; set { _totalPages = value; RaisePropertyChanged(); } }
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#endregion
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#region 命令
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public DelegateCommand SearchCommand { get; }
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public DelegateCommand ClearCommand { get; }
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public DelegateCommand FirstPageCommand { get; }
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public DelegateCommand PrevPageCommand { get; }
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public DelegateCommand NextPageCommand { get; }
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public DelegateCommand LastPageCommand { get; }
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#endregion
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private void ClearFilters()
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{
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Category = "全部";
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Keyword = string.Empty;
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StartTime = DateTime.Today;
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EndTime = DateTime.Today.AddDays(1).AddSeconds(-1);
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}
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private async Task SearchAsync()
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{
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if (IsBusy) return;
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try
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{
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if (StartTime.HasValue && EndTime.HasValue && StartTime > EndTime)
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{
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MessageBox.Show("开始时间不能大于结束时间", "提示", MessageBoxButton.OK, MessageBoxImage.Warning);
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return;
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}
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IsBusy = true;
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_log.Info("HistoryAlarm 查询开始");
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var data = await Task.Run(() =>
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{
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var q = _fsql.Select<HistoryAlarm>();
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DateTime? start = StartTime;
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DateTime? end = EndTime;
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if (start.HasValue) q = q.Where(a => a.CreateTime >= start.Value);
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if (end.HasValue)
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{
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var endInclusive = end.Value;
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if (endInclusive.TimeOfDay == TimeSpan.Zero) endInclusive = endInclusive.Date.AddDays(1).AddTicks(-1);
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q = q.Where(a => a.CreateTime <= endInclusive);
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}
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if (!string.IsNullOrWhiteSpace(Category) && Category != "全部") q = q.Where(a => a.Category == Category);
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if (!string.IsNullOrWhiteSpace(Keyword)) q = q.Where(a => a.Message!.Contains(Keyword));
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q = q.OrderByDescending(a => a.CreateTime);
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var size = PageSize <= 0 ? 20 : PageSize;
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var page = PageIndex < 1 ? 1 : PageIndex;
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var list = q.Count(out var total)
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.Page(page, size)
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.ToList();
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var pages = total <= 0 || size <= 0 ? 0 : (int)Math.Ceiling(total * 1.0 / size);
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if (pages > 0 && page > pages)
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{
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page = pages;
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list = q.Page(page, size).ToList();
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}
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return (items: list, total: (int)total, normalizedPage: page, totalPages: pages);
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});
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Application.Current.Dispatcher.Invoke(() =>
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{
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Items.Clear();
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foreach (var it in data.items) Items.Add(it);
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TotalCount = data.total;
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TotalPages = data.totalPages;
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PageIndex = data.normalizedPage == 0 ? 1 : data.normalizedPage;
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});
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_log.Info($"HistoryAlarm 查询完成，记录数: {TotalCount}");
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}
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catch (Exception ex)
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{
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_log.Error($"HistoryAlarm 查询失败: {ex}");
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MessageBox.Show($"查询失败: {ex.Message}", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
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}
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finally
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{
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IsBusy = false;
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}
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}
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public override async void OnNavigatedTo(Prism.Regions.NavigationContext navigationContext)
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{
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await LoadCategoriesAsync();
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await SearchAsync();
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}
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private async Task LoadCategoriesAsync()
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{
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try
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{
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var list = await Task.Run(() =>
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{
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// 直接在数据库端去重，避免将大量重复数据拉回内存
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var cateList = _fsql.Select<HistoryAlarm>()
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.Where(a => a.Category != null && a.Category != "")
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.Distinct()
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.ToList(a => a.Category);
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return (cateList ?? new System.Collections.Generic.List<string>())
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.Where(s => !string.IsNullOrWhiteSpace(s))
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.OrderBy(s => s)
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.ToList();
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});
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Application.Current.Dispatcher.Invoke(() =>
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{
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CategoryList.Clear();
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CategoryList.Add("全部");
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foreach (var s in list) CategoryList.Add(s);
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if (string.IsNullOrWhiteSpace(Category)) Category = "全部";
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});
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}
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catch (Exception ex)
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{
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_log.Warn($"加载报警类别失败: {ex.Message}");
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Application.Current.Dispatcher.Invoke(() =>
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{
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if (CategoryList.Count == 0) CategoryList.Add("全部");
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if (string.IsNullOrWhiteSpace(Category)) Category = "全部";
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});
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}
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}
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}
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}
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