When I run = null
in Management Studio, it returns no rows but when I run is null
I get data back. In Entity Framework, it is converting the query to is null, Is there any alternative so I can just do the = null
in Entity Framework?
This return no rows
SELECT *
FROM cart c
WHERE OrderId = NULL
This return 1000 rows
SELECT *
FROM cart c
WHERE OrderId IS NULL
EF List count 1000 rows
var Pending = (from c in db.Cart
where sc.OrderId == null
select sc.CartId).ToList();
Null means unknown value. In SQL trying to equate any value to NULL will result in FALSE, which makes sense. As such, 2 = NULL is FALSE. NULL = NULL is FALSE. However, column IS NULL checks that the value of the column is NULL.
The semantics of C# is different and eventually translates your query to IS NULL when the EF framework sends the query to the server.
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