✅ Default interface methods - Am I using them wrong?

I'm trying to learn when/where to properly use interfaces, and I don't understand why my default method doesn't work.

I have this:

public interface IMyInterface {
    string Name { get; set; }
    string JobTitle { get; set; }
    
    void Foo() { Console.WriteLine("Default Foo"); }
}

public class Person {
    public string Name { get; set; }
}

public class Employee : Person, IMyInterface {
    public string JobTitle { get; set; }
}

public interface IMyInterface {
    string Name { get; set; }
    string JobTitle { get; set; }
    
    void Foo() { Console.WriteLine("Default Foo"); }
}

public class Person {
    public string Name { get; set; }
}

public class Employee : Person, IMyInterface {
    public string JobTitle { get; set; }
}

Creating a new instance of

Employee

Employee

should give me access to

employee.Foo()

employee.Foo()

, but it doesn't.

Maybe I'm just overlooking something simple, but I don't understand :/

C#•16mo ago•

9 replies

UnemployedNinja

✅ Default interface methods - Am I using them wrong?

I'm trying to learn when/where to properly use interfaces, and I don't understand why my default method doesn't work.

I have this:

public interface IMyInterface {
    string Name { get; set; }
    string JobTitle { get; set; }
    
    void Foo() { Console.WriteLine("Default Foo"); }
}

public class Person {
    public string Name { get; set; }
}

public class Employee : Person, IMyInterface {
    public string JobTitle { get; set; }
}

public interface IMyInterface {
    string Name { get; set; }
    string JobTitle { get; set; }
    
    void Foo() { Console.WriteLine("Default Foo"); }
}

public class Person {
    public string Name { get; set; }
}

public class Employee : Person, IMyInterface {
    public string JobTitle { get; set; }
}

Creating a new instance of

Employee

Employee

should give me access to

employee.Foo()

employee.Foo()

, but it doesn't.

Maybe I'm just overlooking something simple, but I don't understand :/

✅ Default interface methods - Am I using them wrong?

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