fatihdgn

public class Container
{
    Dictionary<Type, Func<Container, object>> factory;
    public Container()
    {
        factory = new Dictionary<Type, Func<Container, object>>();
    }
    
    public void Register<TReferenceType, TObjectType>(Func<Container, TObjectType> creator = null)
        where TObjectType : TReferenceType

fatihdgn

using Models;
using Providers;

public class CategoryController : ApiController
{
    [ResponseType(typeof(List<Category>))]
    public IHttpActionResult Get() => Ok(CategoryProvider.Categories);

    [ResponseType(typeof(Category))]
    public IHttpActionResult Get(string id) => Ok(CategoryProvider.Categories.FirstOrDefault(x => x.Id == id));

fatihdgn

using Models;

public static class CategoryProvider
{
    public static List<Category> Categories = Enumerable.Range(1, 5).Select(i => new Category { Name = $"Category {i}" }).ToList();
}

fatihdgn

public class Category
{
    public string Id { get; set; } = Guid.NewGuid().ToString();
    public string Name { get; set; }
}