fix 修改离线设备判断逻辑

Src/Dlhis.Canteen/Order/Services/Implements/BalanceService.cs

@@ -551,10 +551,10 @@ public class BalanceService : IBalanceService
     public async Task<ConsumeNumberResponse> GetConsumeNumberAsync()
     {
         var devices = await _dbContext.Queryable<DeviceEntity>()
-            .Where(x => x.Type == DeviceTypeEnumType.Meal)
+            .Where(x => x.Type == DeviceTypeEnumType.Meal && x.Enable)
             .ToListAsync();
 
-        var offCount = devices.Where(x => x.Enable == false).Count();
+        var offCount = GetOfflineDevicesCount(devices).Count;
 
         var places = await _dbContext.Queryable<BusinessPlaceEntity>()
             .ToListAsync();
@@ -592,6 +592,26 @@ public class BalanceService : IBalanceService
         return res;
 
     }
+
+    /// <summary>
+    /// 获取离线设备
+    /// </summary>
+    /// <param name="devices"></param>
+    /// <returns></returns>
+    private List<DeviceEntity> GetOfflineDevicesCount(List<DeviceEntity> devices)
+    {
+        var list = new List<DeviceEntity>();
+        foreach (var device in devices)
+        {
+            TimeSpan timeDifference = DateTime.Now - device.ModifiedTime;
+            if (timeDifference.TotalSeconds > (device.HeartbeatInterval * 3))
+            {
+                list.Add(device);
+            }
+        }
+        return list;
+    }
+
     private async Task<List<ConsumptionTrendResponse>> GetConsumptionTrendsAsync(ConsumptionTrendEnumType type)
     {
         var bs = await _dbContext.Queryable<BalanceRecordEntity>()