FileReaderWriter.cs

public class FileReaderWriter<TData> : IReaderWriter<TData> where TData : Data
{
    public void Initialize() { throw new NotImplementedException(); }

    public TData Read(int dataId) { throw new NotImplementedException(); }

    public void Write(TData data) { throw new NotImplementedException(); }

    Data IReaderWriter.Read(int dataId) { return Read(dataId); }

    void IReaderWriter.Write(Data data) { Write((TData)data); }
}