C# Smart Enum Pattern - Part 2: Optimizing by adding O(1) lookup and helpers

Program.cs

using System;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("--- C# Smart Enum Pattern: Part 2 (O(1) Optimization) ---\n");

        int inputId = 2;

        // 1. Check if it exists in the Dictionary
        if (Status.Exists(inputId))
        {
            // 2. Retrieve the entire object (Instant lookup)
            StatusValue? myStatus = Status.Get(inputId);
            
            if (myStatus != null)
            {
                Console.WriteLine($"Found Object: {myStatus}");
                Console.WriteLine($"Extracted ID: {myStatus.Id}");
                Console.WriteLine($"Extracted Description: {myStatus.Description}");
            }
        }

        // 3. Testing the default helper
        Console.WriteLine($"\nTesting invalid ID (99): {Status.GetDescription(99)}");
    }
}

SmartEnumOptimized.cs

using System.Collections.Generic;
using System.Linq;

public record StatusValue(int Id, string Description);

public static class Status
{
    public static readonly StatusValue Pending = new(1, "Pending Approval");
    public static readonly StatusValue Available = new(2, "Available for Sale");
    public static readonly StatusValue OutOfStock = new(3, "Out of Stock");

    public static readonly StatusValue[] All = { Pending, Available, OutOfStock };

    private static readonly Dictionary<int, StatusValue> _lookup = All.ToDictionary(s => s.Id);

    // O(1) access to the full object
    public static StatusValue? Get(int id) => _lookup.GetValueOrDefault(id);
    
    // Quick existence check
    public static bool Exists(int id) => _lookup.ContainsKey(id);
    
    // Accessing properties
    public static string GetDescription(int id) => Get(id)?.Description ?? "Unknown";
}