初步完成报警设置

DMS.WPF/ViewModels/Dialogs/AlarmSettingsDialogViewModel.cs

@@ -0,0 +1,51 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace DMS.WPF.ViewModels.Dialogs
+{
+    public partial class AlarmSettingsDialogViewModel : DialogViewModelBase<AlarmSettingsResult>
+    {
+        [ObservableProperty]
+        private bool _isAlarmEnabled;
+
+        [ObservableProperty]
+        private double _alarmMinValue;
+
+        [ObservableProperty]
+        private double _alarmMaxValue;
+
+        public AlarmSettingsDialogViewModel(bool currentIsAlarmEnabled, double currentAlarmMinValue, double currentAlarmMaxValue)
+        {
+            IsAlarmEnabled = currentIsAlarmEnabled;
+            AlarmMinValue = currentAlarmMinValue;
+            AlarmMaxValue = currentAlarmMaxValue;
+            Title = "修改报警设置";
+            PrimaryButText = "确定";
+        }
+
+        [RelayCommand]
+        private void PrimaryButton()
+        {
+            var result = new AlarmSettingsResult
+            {
+                IsAlarmEnabled = IsAlarmEnabled,
+                AlarmMinValue = AlarmMinValue,
+                AlarmMaxValue = AlarmMaxValue
+            };
+            Close(result);
+        }
+
+        [RelayCommand]
+        private void CancleButton()
+        {
+            Close(null);
+        }
+    }
+
+    public class AlarmSettingsResult
+    {
+        public bool IsAlarmEnabled { get; set; }
+        public double AlarmMinValue { get; set; }
+        public double AlarmMaxValue { get; set; }
+    }
+}

DMS.WPF/ViewModels/VariableTableViewModel.cs

@@ -764,6 +764,57 @@ partial class VariableTableViewModel : ViewModelBase, INavigatable
         }
     }
 
+    /// <summary>
+    /// 修改选定变量的报警设置。
+    /// </summary>
+    [RelayCommand]
+    public async Task ChangeAlarmSettings()
+    {
+        // 检查是否有变量被选中
+        if (SelectedVariables.Count == 0)
+        {
+            _notificationService.ShowInfo("请选择要修改报警设置的变量");
+            return;
+        }
+
+        // 获取选中的变量列表
+        var validVariables = SelectedVariables.Cast<VariableItemViewModel>()
+                                              .ToList();
+
+        // 显示报警设置对话框，并传入第一个变量的当前报警设置作为默认值
+        var viewModel = new AlarmSettingsDialogViewModel(
+            validVariables.First().IsAlarmEnabled,
+            validVariables.First().AlarmMinValue,
+            validVariables.First().AlarmMaxValue);
+        var result = await _dialogService.ShowDialogAsync(viewModel);
+        
+        if (result != null)
+        {
+            // 更新所有选定变量的报警设置
+            foreach (var variable in validVariables)
+            {
+                variable.IsAlarmEnabled = result.IsAlarmEnabled;
+                variable.AlarmMinValue = result.AlarmMinValue;
+                variable.AlarmMaxValue = result.AlarmMaxValue;
+                variable.UpdatedAt = DateTime.Now;
+            }
+
+            // 批量更新数据库中的变量数据
+            var variableDtos = _mapper.Map<List<VariableDto>>(validVariables);
+            var updateResult = await _variableAppService.UpdateVariablesAsync(variableDtos);
+
+            if (updateResult > 0)
+            {
+                // 显示成功通知
+                _notificationService.ShowSuccess($"已成功更新 {validVariables.Count} 个变量的报警设置");
+            }
+            else
+            {
+                _notificationService.ShowError("更新报警设置失败");
+            }
+        }
+    }
+
     /// <summary>
     /// 当变量表的启用/禁用状态改变时调用。
     /// 更新数据库中变量表的激活状态，并显示相应的通知。