Tag: Pattern

// class implements IModelFactory -> IFactoryModel CreateInstance(string modelName)

private Dictionary<string, Type> _availableTypes;

public ModelFactory() {
    LoadTypes();
}

public IFactoryModel CreateInstance(string modelName)
{
    Type t = GetTypeToCreate(modelName);
    //NOTE: handle null here
    return Activator.CreateInstance(t) as IFactoryModel;
}

private void LoadTypes() 
{
    _availableTypes = new Dictionary<string, Type>();
    Type[] assemblyTypes = Assembly.GetExecutingAssembly().GetTypes();

    assemblyTypes.Where(x => x.GetInterface(typeof(IFactoryModel).ToString()) != null).ToList()
        .ForEach(y => _availableTypes.add(y.Name.ToLower(), y));
}

private IFactoryModel GetTypeToCreate(string name)
{
    _availableTypes.TryGetValue(name, out Type t);
    return t ?? null;
}

source:
https://app.pluralsight.com/library/courses/patterns-library/table-of-contents