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POHow to return validation errors from service class methods?
 

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  1. POHow to return validation errors from service class methods?
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    <p>Can you give me an example of how to return validation errors from a service class used in a web application. What do you think about this approach below?</p> <pre><code>using System; using System.Linq; using System.Web.Mvc; using App.Data; using App.Security; public interface IMembershipService { bool ValidateUser(string userName, string password, ModelStateDictionary model = null); } public class MembershipService : IMembershipService { private DatabaseContext db; public MembershipService(DatabaseContext db) { this.db = db; } public bool ValidateUser(string userName, string password, ModelStateDictionary model) { if (string.IsNullOrWhiteSpace(userName) || userName.Length &gt; 128 || string.IsNullOrWhiteSpace(password) || password.Length &gt; 256) { TryAddModelError(model, "Username or password provided is incorrect."); return false; } var user = this.db.Users.SingleOrDefault(u =&gt; u.UserName == userName); if (user == null || !PasswordHash.Validate(password, user.PasswordHash, user.PasswordSalt)) { TryAddModelError(model, "Username or password provided is incorrect."); return false; } if (!user.IsApproved) { TryAddModelError(model, "Your account is suspended."); return false; } user.LastLoginDate = DateTime.UtcNow; this.db.SaveChanges(); return true; } private static void TryAddModelError(ModelStateDictionary model, string errorMessage) { if (model != null) { model.AddModelError(string.Empty, errorMessage); } } } </code></pre> <p>Usage sample:</p> <pre><code>[Authorize] public class AccountController : Controller { private readonly IMembershipService membershipService; public AccountController(IMembershipService membershipService) { this.membershipService = membershipService; } [HttpPost, AllowAnonymous, ValidateAntiForgeryToken] public Login(LoginModel model, string returnUrl) { if (ModelState.IsValid &amp;&amp; this.membershipService.ValidateUser( model.UserName, model.Password, modelState: ModelState)) { FormsAuthentication.SetAuthCookie(userName, true); return RedirectToLocal(returnUrl); } return View(model); } } </code></pre>
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    1. COIt is rare to found a C# code with goto
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    2. COFendy, do you know how to rewrite it without goto and still avoid code duplicates?
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    3. COVimel Stan's answer is a clean implementation one without goto.
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