CODEWITHSUNDEEP
c#interfaceextension-methods
Zozul
Zozul

Reputation: 11

How to use extension-method that uses interface

So i'm trying to make a static class called ActionExtensions which has a body like this:

public static class ActionExtensions {
        public static IContainer Add<TObjectType>(this IContainer container, TObjectType obj) {
            return container;
        }
}

and uses interface IContainer. I also have a class called Student with list of grades:

public class Student, IContainer {
        public IList<int> Grades{ get;set;}
}

Now I want to do something like this:

var student = new Student();
student.Add(3); //adding grade 3 to list of student's grades

But i don't want to define an Add method to a Student class. Rather use my method from ActionExtensions. Is this even possible?

Upvotes: 1

Views: 432

Answers (1)

SeeDee
SeeDee

Reputation: 101

It is possible. You could do it like this:

public interface IContainer<T>
{
   IList<T> Values { get; }
}

public static class ContainerExtensions
{
    public static void Add<T>(this IContainer<T> container, T value) =>
       container.Values.Add(value);
}

public class Student : IContainer<int>
{
    public List<int> Grades { get; set; }
    IContainer<int>.Values => Grades;
}

You can than use it like this

var student = GetSomeStudent();
student.Add(3);

Upvotes: 1

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