Question

My List collection like below

List<Class> classes = new List<Class>()
{
    new Class() 
    { 
        className = "A",
        students = new List<Student>()
        { 
            new Student{ name="SA"}, 
            new Student{ name="SB"},
            new Student{ name="SC"},
        }
    },
    new Class()
    {
        className = "B",
        students = new List<Student>()
        { 
            new Student{ name="SD"}, 
            new Student{ name="SA"},
            new Student{ name="SA"},
        }                   
    }
}

I want the Distinct student name from the classes Using Linq in the format List<string>. I tried to get in single linq query but get like., List<List<string>>. I need List<string>.

Answer 1

It should be something like:

var students = classes.SelectMany(p => p.Students).Select(p => p.Name).Distinct();

The SelectMany merges the List<Student>, the second Select selects only the Name of the student.