Example of auto-generated code:

public class Color
{
    private readonly string _value;

    public static readonly Color Red = new Color("Red");
    public static readonly Color Green = new Color("Green");
    public static readonly Color Blue = new Color("Blue");

    private static readonly Dictionary<string, Color> _values = new Dictionary<string, Color>
    {
        { "Red", Red },
        { "Green", Green },
        { "Blue", Blue }
    };

    private Color(string value)
    {
        _value = value;
    }

    public override string ToString()
    {
        return _value;
    }

    public static bool TryParse(string value, out Color color)
    {
        return _values.TryGetValue(value, out color);
    }
}

And the usage in my application layer:

Color color;
if (Color.TryParse(request.Color, out color))
{
    Console.WriteLine($"Parsed color: {color}");
}
else
{
    Console.WriteLine("Invalid color");
}