Capstone: RPG Character & Inventory Engine

In Plain English

Congratulations on reaching the final capstone lesson! In this comprehensive project, you will unite everything you learned across the C# curriculum: classes, auto-properties, constructors, generic List<Item> collections, method logic, and string interpolation to build a full RPG Character & Inventory Management System.

The Mental Model

"You now possess all the core building blocks of C#: high-performance .NET execution, strong type safety, modular methods, dynamic collections, and object-oriented encapsulation. Now let's build a complete game system!"

Deep Dive: How It Works

Item Class: Represents inventory items with Name and GoldValue.

Character Class: Encapsulates Name, Level, Health, and a generic List<Item> inventory collection.

Methods: PickUpItem(), UseItem(), and PrintCharacterSheet() simulating real game mechanics.

Syntax Blueprint

class Item { public string Name { get; set; } }
class Player {
  public List<Item> Bag { get; set; } = new();
}

Composite object models featuring nested generic collections.

Core Rules to Remember

The Complete C# Stack: Classes + Properties + List<T> + Methods + String Interpolation.

Production-Grade Architecture: The exact design patterns used in commercial Unity and ASP.NET Core apps.

Ready for Next Steps: You now possess the foundational mastery to build Unity games, cloud microservices, and enterprise web apps.

Common Beginner Traps & How to Fix Them

Mistake:Forgetting to initialize a nested list: public List<Item> Bag;

Why it happens: Leaving the list null causes NullReferenceException when calling Bag.Add().

How to fix: Always initialize: public List<Item> Bag { get; set; } = new List<Item>();.

Pro Tip: You can take this exact code structure and plug it directly into a Unity game script!

Live Interactive Example

Hit Run Code to see it live

Complete RPG Character & Inventory Engine

C# 12 / .NET

using System;
using System.Collections.Generic;

class Item {
    public string Name { get; set; }
    public int Value { get; set; }

public Item(string name, int value) {
        Name = name;
        Value = value;
    }
}

class Character {
    public string Name { get; set; }
    public string ClassType { get; set; }
    public int Level { get; set; }
    public int Health { get; set; }
    public List<Item> Inventory { get; set; }

public Character(string name, string classType, int level, int health) {
        Name = name;
        ClassType = classType;
        Level = level;
        Health = health;
        Inventory = new List<Item>();
    }

public void Loot(Item item) {
        Inventory.Add(item);
        Console.WriteLine($"[Loot] {Name} obtained: {item.Name} (Value: {item.Value}g)");
    }

public void PrintSheet() {
        Console.WriteLine("========================================");
        Console.WriteLine($"Character Sheet: {Name} the {ClassType}");
        Console.WriteLine($"Level: {Level} | Health: {Health} HP");
        Console.WriteLine($"Inventory ({Inventory.Count} items):");
        int totalWorth = 0;
        foreach (Item itm in Inventory) {
            Console.WriteLine($" - {itm.Name} ({itm.Value} gold)");
            totalWorth += itm.Value;
        }
        Console.WriteLine($"Total Bag Value: {totalWorth} gold");
        Console.WriteLine("========================================");
    }
}

class Program {
    static void Main() {
        Character hero = new Character("Eldrin", "Battle Mage", 5, 120);

hero.Loot(new Item("Staff of Embers", 250));
        hero.Loot(new Item("Mana Crystal", 75));
        hero.Loot(new Item("Elixir of Speed", 40));

hero.PrintSheet();
    }
}

Output Console

Click "Run Code" to view the rendered output.

How it works: A production-grade C# OOP engine demonstrating full language synergy.

Your Turn: Micro Challenge

No pressure! Edit the starter code below and test your solution with instant feedback.

Micro Exercise

Loot an item into character inventory

Add a Loot method: public void Loot(string itemName) { Inventory.Add(itemName); }
In Main(), initialize Character c = new Character(); c.Inventory = new List<string>();
Call c.Loot("Excalibur"); and print "Inventory: 1 items".

Sandbox Output

Click "Run & Check" to test your solution.

Finished reading and practicing?