LINQ case sensitive

Question

How to make LINQ case sensitive and NOT case sensitive depending on the situation?

I\'m using sql server 2008 and Entity Framework 4.0.

I changed the COLLATI

Answer 1

LINQ has no concept of case sensitivity, it only cares about boolean evaluation. So if you want to ignore case, you should do something like:

query = query.Where(x => (x.Name.ToLower().Contains(Name.ToLower())));

Chances are you will want to pass a CultureInfo to ToLower() (or use ToLowerInvariant()), and you might want to cache the result of Name.ToLower() so as to not have to perform that operation a potentially large number of times, but this should get you started.

Answer 2

Read my reply to this:

String.Equals() not working as intended

It isn't the reply you wanted, probably :-)

Ah... and if you have to convert to the same case to make comparisons, ToUpper is better than ToLower. Don't ask me why. But you can read here: Case insensitive string compare in LINQ-to-SQL

Answer 3

query = query.Where(x => string.Equals(x.Name, Name, StringComparison.CurrentCultureIgnoreCase));

Answer 4

Queryable.Contains has an overload taking an IEqualityComparer<T> used for comparision. See msdn. If you supply a case insensitive comparer, this should work - I'm quite sure there is one in the framework already.