I have following code in my page:
var myVar= Entity.SetName
.Where(p => int.Parse(p.ID) >= start &&
int.Parse(p.ID) <= end);
start and end are int, but p.ID is string. So i should convert p.ID to int. But i get following error:
LINQ to Entities does not recognize the method 'Int32
Parse(System.String)' method, and this method cannot be translated
into a store expression.
Where is the problem??
Best Answer
First, I would highly recommend to check your database design, whether there is a really good reason for
ID
to be astring
. I would consider changing theID
DB type toint
and you will get rid of this problem with converting.The error you get means, that EF does not know how to convert the method
Int32.Parse()
to SQL. Basically you have two options how to deal with that:Do the comparison outside the linq to entities:
But this is not recommended, because you are reading whole result set from DB, before applying the
where
condition.Or make custom model defined function as described in this post on SO:
Convert String to Int in EF 4.0 or Entity Framework: Where do I extend the CSDL/MSL?