how access list of object inside a list of object in c#-CodePudding

This is a teacher objects

List<Teacher> teachername = new List<Teacher>();

Teacher teach = new Teacher();

teachername.Add(new Teacher("malathy", 2341, 987452165,0));
teachername.Add(new Teacher("shobhana", 3432, 4512789,1));
teachername.Add(new Teacher("indira", 6432, 243254564,2));

This is students object

teach.studentlist.Add(new Student("manu", 1, "babu",2341));
teach.studentlist.Add(new Student("anu", 1, "sabu", 2341));
teach.studentlist.Add(new Student("hiba", 2, "vasu", 3432));
teach.studentlist.Add(new Student("shuba", 2, "gopi", 3432));
teach.studentlist.Add(new Student("indu", 3, "soman",6432));
teach.studentlist.Add(new Student("indira", 3, "Raman", 6432));

I want to separate and control the students by its numbers,ie,the 1 numbers students are under teacher malathy.2 number students are under shobhana.

CodePudding user response：

Since we have no information about name's of objects properties, I'll just give them my own.

Option 1: foreach

Update: As @DavideVitali mentioned in the comment section, it's and option that there is no implementation of the IEnumerbale, so I'll go with the foreach.

foreach(var item in teach)
{
   if(item.TeacherID == 1)
   {
     List<Student> MalathyStudents = new List<Student>();
     MalathyStudents.Add(item);
   }
   if(item.TeacherID == 2)
   {
     List<Student> ShobhanaStudents = new List<Student>();
     ShobhanaStudents.Add(item);
   }
   if(item.TeacherID == 3)
   {
     List<Student> IndiraStudents = new List<Student>();
     IndiraStudents.Add(item);
   }
}

Option 2: Linq.

Note: You will have to import using System.Linq;

I've changed the values of the last element in your objects, removed the 0 -

teachername.Add(new Teacher("malathy", 2341, 987452165, 1));
teachername.Add(new Teacher("shobhana", 3432, 4512789, 2));
teachername.Add(new Teacher("indira", 6432, 243254564, 3));



  var MalathyStudents = teach.Where(s => s.TeacherID == 1).ToList();
  var shobhanaStudents = teach.Where(s => s.TeacherID == 2).ToList();
  var indiraStudents = teach.Where(s => s.TeacherID == 3).ToList();

CodePudding user response：

var MalathysStudents = studentlist.Where(s=>s.TeacherId==1).ToList();