The difference between select and selectmany is
Select gets a list of lists of X objects
SelectMany gets a list of X objects
Let me give you an example
public class Course
{
public string CourseName { get; set; }
}
public class Student
{
public string Name { get; set; }
public List<Course> Courses { get; set; }
public Student()
{
this.Courses = new List<Course>();
}
}
var studentList = GenerateRandomStudentList();
// SelectMany returns List<Course>
List<Course> selectManyCourses = studentList.SelectMany(x => x.Courses).ToList();
// Select returns List<List<Course>>
List<List<Course>> selectCourses = studentList.Select(x => x.Courses).ToList();
You can download source code from here –> Download
