AutomobilePlant/AutomobilePlantDatabaseImplement/Implements/MessageInfoStorage.cs

@@ -23,7 +23,7 @@ namespace AutomobilePlantDatabaseImplement.Implements
         {
             using var context = new AutomobilePlantDatabase();
             var messages = context.Messages
-                .Where(x => !model.ClientId.HasValue || x.ClientId == model.ClientId)
+                .Where(x => x.ClientId == model.ClientId)
                 .Select(x => x.GetViewModel)
                 .ToList();
             if (!model.Page.HasValue || !model.PageSize.HasValue)

AutomobilePlant/AutomobilePlantFileImplement/Implements/MessageInfoStorage.cs

@@ -26,7 +26,7 @@ namespace AutomobilePlantFileImplement.Implements
         public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
         {
             var messages = _source.Messages
-                .Where(x => !model.ClientId.HasValue || x.ClientId == model.ClientId)
+                .Where(x => x.ClientId == model.ClientId)
                 .Select(x => x.GetViewModel)
                 .ToList();
             if (!model.Page.HasValue || !model.PageSize.HasValue)

AutomobilePlant/AutomobilePlantListImplement/Implements/MessageInfoStorage.cs

@@ -28,7 +28,7 @@ namespace AutomobilePlantListImplement.Implements
             List<MessageInfoViewModel> result = new();
             foreach (var item in _source.Messages)
             {
-                if (!model.ClientId.HasValue || item.ClientId == model.ClientId)
+                if (item.ClientId.HasValue && item.ClientId == model.ClientId)
                 {
                     result.Add(item.GetViewModel);
                 }