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copied!<p>One approach would be to utilize the <a href="http://en.wikipedia.org/wiki/Specification_pattern" rel="nofollow">Specification pattern</a>.</p> <p>So, basically, your item would have a <code>WearerSpecification</code> property which returns a specification that returns true if the current character satisfies it.</p> <p>Something like this:</p> <pre><code>public abstract class Item { private readonly ISpecification<Character> _wearerSpecification; protected Item(ISpecification<Character> wearerSpecification) { _wearerSpecification = wearerSpecification; } public ISpecification<Character> WearerSpecification { get { return _wearerSpecification; } } } </code></pre> <p>In the method that is called when the character tries to pick up an item, the code would look something like this:</p> <pre><code>public class Character { public void PickUpItem(Item item) { if(item.WearerSpecification.SatisfiedBy(this)) { // item can be picked up } else { // item can't be picked up } } } </code></pre> <hr> <p>To simplify the actual creation of your items and to not repeat your code, you can create concrete specification classes that represent requirements that often occur, e.g. you could create a <code>AtLeastLevel10Specification</code> or a <code>MinimumStrengthSpecification</code>:</p> <pre><code>public class AtLeastLevel10Specification : ISpecification<Character> { public bool IsSatisfiedBy(Character character) { return character.Level >= 10; } } public class MinimumStrengthSpecification : ISpecification<Character> { private readonly int _minimumRequiredStrength; public MinimumStrengthSpecification(int minimumRequiredStrength) { _minimumRequiredStrength = minimumRequiredStrength; } public bool IsSatisfiedBy(Character character) { return character.Strength >= _minimumRequiredStrength; } } </code></pre> <p>You would then possible use these classes directly inside your item declaration:</p> <pre><code>public class VeryHeavyShield : Item { public VeryHeavyShield() : base(CreateSpecification()) { } private static ISpecification<Character> CreateSpecification() { return new AtLeastLevel10Specification().And( new MinimumStrengthSpecification(50)); } } </code></pre>

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