调整接口调用错误

DataVAPI.ServerDB/MongoDB/MongodbHelper.cs

@@ -160,11 +160,11 @@ namespace DataVAPI.ServerDB.MongoDB
                 {
                     if (string.IsNullOrEmpty(deviceId))
                     {
-                        return collection.Find(a => a.ClientId == clientId)?.ToList().OrderByDescending(a => a.CreateTime).ToList();
+                        return collection.Find(a => a.ClientId == clientId)?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
                     }
                     else
                     {
-                        return collection.Find(a => a.ClientId == clientId && a.DeviceId == deviceId)?.ToList().OrderByDescending(a => a.CreateTime).ToList();
+                        return collection.Find(a => a.ClientId == clientId && a.DeviceId == deviceId)?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
                     }
                 }
             }
@@ -177,22 +177,23 @@ namespace DataVAPI.ServerDB.MongoDB
 
         public List<T> QueryClientIdNew(string clientId)
         {
-            return collection.Find(a => a.ClientId == clientId && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime).ToList();
+            return collection.Find(a => a.ClientId == clientId && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
         }
 
         public List<T> QueryClientId(string clientId)
         {
-            return collection.Find(a => a.ClientId == clientId && a.CreateTime >= DateTime.Now.Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime).ToList();
+            return collection.Find(a => a.ClientId == clientId && a.CreateTime >= DateTime.Now.Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
         }
 
         public T QueryClientIdMax(string clientId)
         {
-            return collection.Find(a => a.ClientId == clientId && a.CreateTime >= DateTime.Now.AddDays(-1).Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime).ToList()[0];
+            List<T> clo = collection.Find(a => a.ClientId == clientId && a.CreateTime >= DateTime.Now.Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
+            return clo.Count>0?clo[0]:null;
         }
 
         public List<T> QueryDeviceId(string clientId, string deviceId)
         {
-            return collection.Find(a => a.DeviceId == deviceId && a.ClientId == clientId && a.CreateTime >= DateTime.Now.Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime).ToList();
+            return collection.Find(a => a.DeviceId == deviceId && a.ClientId == clientId && a.CreateTime >= DateTime.Now.Date && a.State == "y")?.ToList().OrderByDescending(a => a.CreateTime)?.ToList();
         }
 
         public List<T> QueryAll()