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POInherited C# Class Losing "Reference"
 

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    <p>I have a partial class using an interface because I can’t inherit what was an original abstract class due to the other partial class being auto-generated from Entity Framework 4 and therefore already inheriting ObjectContext.</p> <p>I have the following for my partial class:</p> <pre><code>namespace Model { using Microsoft.Practices.EnterpriseLibrary.Validation; using Microsoft.Practices.EnterpriseLibrary.Validation.Validators; using Utilities.BusinessRules; using Utilities.BusinessRules.Rules; [HasSelfValidation] public partial class MyObject : IBusinessObject { private readonly IBusinessObject businessObject = new BusinessObject(); private IBusinessObject BusinessObject { get { return businessObject; } } public Comment() { AddRule(new ValidateRequired("Title")); } public void AddRule(BusinessRule rule) { BusinessObject.AddRule(rule); } [SelfValidation] public void Validate(ValidationResults results) { BusinessObject.Validate(results); } } } </code></pre> <p>Here’s the interface:</p> <pre><code>namespace Utilities.BusinessRules { using Microsoft.Practices.EnterpriseLibrary.Validation; public interface IBusinessObject { void AddRule(BusinessRule rule); void Validate(ValidationResults results); } } </code></pre> <p>And the implementation:</p> <pre><code>namespace Utilities.BusinessRules { using System.Collections.Generic; using System.Linq; using Microsoft.Practices.EnterpriseLibrary.Validation; using Microsoft.Practices.EnterpriseLibrary.Validation.Validators; public class BusinessObject : IBusinessObject { private readonly IList&lt;BusinessRule&gt; businessRules = new List&lt;BusinessRule&gt;(); public void AddRule(BusinessRule rule) { this.businessRules.Add(rule); } [SelfValidation] public void Validate(ValidationResults results) { foreach (var rule in this.businessRules) { if (!rule.Validate(this)) { results.AddResult(new ValidationResult(rule.ErrorMessage, this, rule.Key, rule.Tag, null)); } } } } } </code></pre> <p>Don’t worry about the rules, they work. The problem is if I use an abstract class in a test project, the Validate() method in BusinessObject will correctly identity (this) as whatever class inherited the abstract class (in this example, I would expect that to be MyObject). Unfortunately, switching to an Interface, (this) loses the inheriting class and instead identifies this as BusinessObject.</p> <p>How can I make it so the inheriting class is properly identified?</p> <p>Here’s the calling console class:</p> <pre><code>namespace ModelConsumer { using Model; using System; using Microsoft.Practices.EnterpriseLibrary.Validation; class Program { static void Main(string[] args) { using (var myEntities = new MyEntities()) { var myObject= new MyObject(); myObject.Title = "Credo"; var validationResults = Validation.Validate(myObject); if (validationResults.IsValid) { myEntities.MyObjects.AddObject(myObject); //myEntities.SaveChanges(); Console.WriteLine("Valid."); } else { foreach (var validationResult in validationResults) { Console.WriteLine(validationResult.Message); } } Console.Read(); } } } } </code></pre> <p>This should be valid but will instead be invalid because (this) is identified as being type BusinessObject instead of MyObject.</p> <p>Argh! I'm so close, it's pretty vexing.</p> <p>Richard</p>
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    1. COWhy does `public Comment()` not have a return type?
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    2. COThat's a constructor, so doesn't have a return type.
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