c# - interface List Error "does not implement interface member"

Question

I'm expanding on my previous question, which was solved. How to call Method's Class Name dynamically?

interface IVideoCodec works with void Methods successfully, but it is not working with List.

VP8 Class gives the error 'VP8' does not implement interface member 'Controls.IVideoCodec.test'

---

File: VideoControls.cs

namespace Controls.Video
{
    public class Controls
    {
        private static Dictionary<string, IVideoCodec> _vCodecClass;

        private static void InitializeCodecs()
        {
            _vCodecClass = new Dictionary<string, IVideoCodec> {
                { "VP8",  new Codec.VP8() },
                { "VP9",  new Codec.VP9() },
                { "x264", new Codec.x264() },
                { "x265", new Codec.x265() }
            };
        }

        public interface IVideoCodec
        {
            List<string> test { get; set; } // doesn't work

            //void Example(); // works
        }

        public static void SetControls(string codec_SelectedItem)
        {
            InitializeCodecs();

            List<string> example = _vCodecClass[codec_SelectedItem].test; // equal to Codec.VP8.test

            //_vCodecClass[codec_SelectedItem].Example(); // equal to Codec.VP8.Example() // works
        }
    }
}

File: VP8.cs

namespace Controls.Video.Codec
{
    public class VP8 : Controls.IVideoCodec // <-- Gives Error
    {
        public List<string> test = new List<string>()
        {
            "1",
            "2",
            "3"
        };

        public void Example()
        {
            //...
        }
    }
}

Answer 1

In your interface you declare a property but in VP8 you have a field. Change it to

public class VP8 : Controls.IVideoCodec // <-- Gives Error
{
    public List<string> test  {get; set;} = new List<string>()
    {
        "1",
        "2",
        "3"
    };

    public void Example()
    {
        //...
    }
}