How can I use string value for passing Type for Type<T> parameter? [duplicate]

Question

I am trying to create a list of object of Student in School. Instead of Student the School can also have Teacher as a list. I want to use the class name as a parameter instead of the actual class type as a parameter while initiating class.

public class Program
{
    static void Main(string[] args)
    {
       //School object with list of student
        var schoolWithStudent = SchoolWithOject("Student");
        //School object with list of teacher
        var schoolWithTeacher = SchoolWithOject("Teacher");
    }

    public static object SchoolWithOject(string objType)
    {
        var objType = Type.GetType("objType");
        var school = new School<objType>();
        return school;
    }   
}

public class School<T>
{
    public int Id;
    public string Name;
    private List<T> _components;

    public School()
    {
        _components = new List<T>();
    }
}

public class Student
{
    public int Id;
    public string Name;
}

public class Teacher
{
    int Id;
    string Name;
}

Have you asked yourself why you would want this? Your code does not seem dynamic at all, what is wrong with new School<Student>();? — maccettura
– maccettura, Commented Oct 11, 2017 at 15:25
Also, if Teacher and Student have the same properties (or share some number of properties) it should be abstracted into a base class or an interface (like Person or something). That way you can restrict your School<T> to only allow the common abstraction — maccettura
– maccettura, Commented Oct 11, 2017 at 15:26
I have written this code just to demonstrate the problem. In real time I won't be aware of which Class it would be using. I would just have Class in my project. The Type of list selection needs to be dynamic and passed at the runtime. — Jeetendra Tandel
– Jeetendra Tandel, Commented Oct 11, 2017 at 15:28
School<T> means each school object can only have one type of list (that type being T, which you provide when using new). That seems like the wrong abstraction; you can have a school of only students, or a school of only teachers, but not a school with both. — Joe Sewell
– Joe Sewell, Commented Oct 11, 2017 at 15:29

S. Spindler · Accepted Answer · 2017-10-11 15:31:05Z

0

If I understand your question correctly and you are not forced to use generics, I would recommend the following solution.

Since a school contains students and teachers you can implement an interface for both types.

interface IPerson
{
    public int Id;
    public string Name;
}

class Student : IPerson
{
    // student specific stuff
}

class Teacher : IPerson
{
    // teacher specific stuff
}

So your school looks like this:

public class School
{
    public int Id;
    public string Name;
    private List<Person> _persons;

    public School()
    {
        _persons = new List<Person>();
    }
}

answered Oct 11, 2017 at 15:31

S. Spindler

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3 Comments

Jeetendra Tandel Over a year ago

The problem would this approach would that the Dynamic Class won't be implementing the interface. They can be anything.

S. Spindler Over a year ago

Maybe try to find a better example or description of your problem.

Jeetendra Tandel Over a year ago

I have just edit the code. Hope it explains my problem a bit better. Thank you for your answer.

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