CODEWITHSUNDEEP
c#
CPDS
CPDS

Reputation: 597

Can we create a dictionary with in a list in C#?

I have to create a list as follows : name, roll no subjectno, subject type subject no, subject type

e.g. 

name[0] = ron, roll no[0] = 12
        subjectno[0]=1, subject type[0]="english"
        subjectno[1]=12, subject type[1]="maths"

name[1] = elis, roll no[1] = 11
      subjectno[0]=1, subject type[0]="english"
      subjectno[1]=12, subject type[1]="maths"
      subjectno[2]=14, subject type[2]="physics"

I am not sure how to do this in C#. I tried making a list of student info and then for subject no and subject type i tried to make a dictionary. I have written the code like this - 

class Student
{


    public class StudentInfo
    {
        public String name { get; set; }
        public int rollno { get; set; }
        Dictionary<String, String> subjects;
        public StudentInfo(String name, int rollno)
        {
            this.name = name;
            this.rollno = rollno;
        }
        public void addstudentinfo(string subjectno, string subjecttype)
        {
            if (subjects == null)
                subjects = new Dictionary<string, string>();

            subjects.Add(subjectno, subjecttype);

        }
    }

Upvotes: 0

Views: 181

Answers (3)

Evgeny Gavrin
Evgeny Gavrin

Reputation: 7825

You can create struct or class to contain student's info and than add it to Dictionary<string, StudInfo>, where string is student name as Key.

Class for storing student info:

public class StudInfo
{
    public int RollNum;
    public List<string> Activities = new List<string>();

    public StudInfo(int num)
    {
        RollNum = num;
    }

}

And its usage:

var dict = new Dictionary(string, StudInfo);
var info = new StudInfo(12);
dict.Add("Ellis", info);

Upvotes: 0

Agamand The True
Agamand The True

Reputation: 832

Here how I would do. First create these two class

public class Student
{
    public int RollNo { get; set; }
    public string Name { get; set; }
    public Student(int rNo, string name)
    {
        this.RollNo = rNo;
        this.Name = name;
    }
    public Student()
    {
    }
}

public class Subject
{
    public int SubjectNo { get; set; }
    public string Type { get; set; }
    public Subject(int sNo, string sType)
    {
        this.SubjectNo = sNo;
        this.Type = sType;
    }
    public Subject()
    {
    }
}

Then fill in the objects as follows :-

  Dictionary<Student, List<Subject>> studentLists = new Dictionary<Student, List<Subject>>();
  Student std = new Student() { RollNo = 11, Name = "John" };
  List<Subject> sbj = new List<Subject>() {new Subject(020, "Math"),new Subject(030,"English") };
  studentLists.Add(std, sbj);

Then iterate thru the Dictionary as follows:-

 StringBuilder sb = new StringBuilder();
    foreach (KeyValuePair<Student, List<Subject>> item in studentLists)
    {
        sb.Append("Student No : " + item.Key.RollNo + "<br />");
        sb.Append("Student Name : " + item.Key.Name + "<br />");

        foreach (var subjects in item.Value)
        {
            sb.Append("Subject No : " + subjects.SubjectNo + "<br />");
            sb.Append("Subject Name : " + subjects.Type + "<br />");
        }
    }

Hope this helps.

Upvotes: 1

Nithin Philips
Nithin Philips

Reputation: 330

Your requirements aren't clear, but it looks best to create a Subject class as well.

class Subject{
    public int Id {get;set;}
    public string Type {get;set;}
}

From there, you can change Dictionary<String, String> subjects to a simple List<Subject> type. And change addstudentinfo method to take a Subject as a parameter.

You can further improve it by ensuring that only one instance of a particular Subject ever exists by modifying the Subject class (For example, to use the Creator pattern).

Upvotes: 0

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