Question

After reading the example of Microsoft here

        var query = from Student student in arrList
                    where student.Scores[0] > 95
                    select student;

        foreach (Student s in query)
            Console.WriteLine(s.LastName + ": " + s.Scores[0]);

I have a question :

Is it possible to avoid the loop ?

    foreach (Student s in query)
        Console.WriteLine(s.LastName + ": " + s.Scores[0]);

What if i rewrite the query and assume my query will always return one result.

    var query = from Student student in arrList
                where student.FirstName == "Cesar"
                select student;

I dont need to do a loop… I know that my query return only one element.

Answer 1

It will still be an IEnumerable, but with one item. If you want to extract it you can use First() or even better Single():

var query = from Student student in arrList
            where student.FirstName == "Cesar"
            select student;

var student = query.Single();

Also you can replace the entire where clause by using Single/First overloaded methods:

var emperor = arrList.Single(s => s.FirstName == "Cesar");

Single is more strict than First since it will also check that there is exactly one item returned.