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POTell me what is stupid about my Entity Validation (and how to improve it)
 

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    <p>I have an IEntity interface that implements an interface, IValidatable</p> <pre><code>public interface IValidatable { bool IsValid { get; } bool IsValidForPersistence { get; } // Rules applied at UI time (please enter your name, etc) IEnumerable&lt;RuleViolation&gt; GetRuleViolations(); // Rules to be applied only at persistence time IEnumerable&lt;RuleViolation&gt; GetPersistenceRuleViolations(); } public interface IEntity : IValidatable { int ID { get; set; } } </code></pre> <p>and for convenience sake I've implemented my Entity class like:</p> <pre><code> public abstract class Entity : IEntity { public virtual int ID { get; set; } public virtual bool IsValid { get { return RuleViolations().Count() == 0; } } public virtual bool IsValidForPersistence { get { return PersistenceRuleViolations().Count() == 0; } } public virtual IEnumerable&lt;RuleViolation&gt; GetRuleViolations() { return new List&lt;RuleViolation&gt;(); } public virtual IEnumerable&lt;RuleViolation&gt; GetPersistenceRuleViolations() { return new List&lt;RuleViolation&gt;(); } } </code></pre> <p>By default entities are valid, until GetRuleViolations() or GetPersistenceRuleViolations() are overridden.</p> <pre><code> public partial class Company { public override IEnumerable&lt;RuleViolation&gt; GetRuleViolations() { if (String.IsNullOrEmpty(CompanyName)) yield return new RuleViolation("CompanyName", "Name is required."); } public override IEnumerable&lt;RuleViolation&gt; GetPersistenceRuleViolations() { // Include standard rules too foreach (RuleViolation rule in RuleViolations) { yield return rule; } // Check some data based on a referenced entity "Bid" if (!Active &amp;&amp; Bid.Active) yield return new RuleViolation("Active", "When Active is set to false, the Bid must also be inactive."); } } </code></pre> <p>I know this is a bit naive for validation, so besides any typos, what can be improved?</p>
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