how do i return this instance of the IInfocard interface?

Question

i am currently trying to return a instance of the Iinforcard interface within my "createNewInfocard" function, however i keep running into error CS0266. i am unsure as to how fix this.

public interface IInfoCard
    {
        string Name { get; set; }
        string Category { get; }
        string GetDataAsString();
        void DisplayData(Panel displayPanel);
        void CloseDisplay();
        bool EditData();
    }




public interface IInfoCardFactory
{
    IInfoCard CreateNewInfoCard(string category);
    IInfoCard CreateInfoCard(string initialDetails);
    string[] CategoriesSupported { get; }
    string GetDescription(string category);
}

 public class Class1 : IInfoCardFactory
    {

    public IInfoCard CreateNewInfoCard(string category)
    {

        Class1 x;
        x = new Class1();
        return x;// i keep at getting error CS0266 at this return statement.
    }


}

Answer 1

Class1 must implement IInfoCard interface, i.e.

  public class Class1 : 
     IInfoCardFactory, 
     IInfoCard  // <- notice IInfoCard implementation
  {
     public IInfoCard CreateNewInfoCard(string category)
     {
        Class1 x;
        x = new Class1();
        return x;// i keep at getting error CS0266 at this return statement.
     }
     ...
     //TODO: put here IInfoCard methods and properties implementations
  }

now, in your current code, Class1 implements IInfoCardFactory but not IInfoCard

Answer 2

Do you have a class that implements your IInfoCard interface?

An interface on its own is just going to define some functionality that a class should have, so you need a concrete implementation in order to use it :

// Notice the IInfoCard declaration, indicating Class1 implements it
public class Class1 : IInfoCardFactory, IInfocard
{
     /* Omitted for brevity */
}

This should allow you to return your Class1 object from your CreateNewInfoCard() method as it will now qualify as an IInfoCard object since it implements it.