在实体框架中添加AsNoTracking会影响计数吗？

Question

Does adding AsNotracking function to a count in Entity Framework 6 has an impact on a count? More specifically does it improve or decrease performance or will the count result get cached?

With AsNoTracking

myContext.Products.AsNoTracking().Count();

Without AsNoTracking

myContext.Products.Count();

Answer 1

Since no entities are being generated with this query, there is nothing to track, therefore no difference in performance. The SQL generated from this would look something like this:

SELECT COUNT(1)
FROM [dbo].[Products]

which obviously returns a single row. If it was creating entities to be tracked, it would have to return every single entity in that table.