How to force derived class to implement a property in C#

Question

I have scenario like below

public abstract class Test 
{
   public string name; 
   public abstract bool is_selected();
}

public class Campus : Test 
{  

}

Now Campus must and should implement is_selected() method otherwise it throws an error. Adding to the same lines I want 'name' field also like that. I mean name field must be given a value.

How can I do that? Any help greatly appreciated.

Thanks in advance :)

Answer 1

I can find two options

1. Use a parameterized constructor, so the derived class must provide a constructor which initialize the fields.

public abstract class Test 
{
   public string name;
   protected Test(string name){ this.name = name; }
}

public class Campus : Test 
{
   public Campus() : base("Init the name here") {}
}

2. Use an abstract property, this is already metioned by other people.

public abstract class Test 
{
   public abstract string name { get; }
}

public class Campus : Test 
{  
   public override string name => "name";
}