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POASP.NET MVC: DataAnnotations - Show an error message indicating that a field must be numeric
 

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  1. POASP.NET MVC: DataAnnotations - Show an error message indicating that a field must be numeric
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    <p>There appears to be something of a hole in the way DataAnnotations works in that a user entering in some text into a field that will go into an int will never reach the DataAnnotations code. It kicks off a model binding error and displays the error to the user "The value 'a' is not valid for the XXXX field."</p> <p>Anyway, it's all very nice that it automatically handles this situation, but I actually want to display an error message indicating the problem eg. "The value 'a' is not numeric. Please enter in a numeric value for the XXXX field".</p> <p>I have tried the solutions set out <a href="https://stackoverflow.com/questions/1538873/how-to-replace-the-default-modelstate-error-message-in-asp-net-mvc-2">How to replace the default ModelState error message in Asp.net MVC 2?</a> and <a href="https://stackoverflow.com/questions/646270/asp-net-mvc-custom-validation-message-for-value-types/1374653#1374653">ASP.NET MVC - Custom validation message for value types</a>, but I can't get them to work.</p> <p>It appears that my resource file is not being read at all, since here (<a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.defaultmodelbinder.resourceclasskey.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.web.mvc.defaultmodelbinder.resourceclasskey.aspx</a>) it states "If the property is set to an invalid class key (such as a resource file that does not exist), MVC throws an exception." and even if I change the line to DefaultModelBinder.ResourceClassKey = "asdfasdhfk" there is no exception.</p> <p>Anyone have any ideas?</p> <p>EDIT: Here is some code. All of it is working minus my Messages.resx file's messages are not being used. The code for Messages.resx is auto generated so I won't include it.</p> <p>So entering "a" into ProcessOrder results in a generic message rather than what I have entered into Messages.resx for PropertyValueInvalid (and InvalidPropertyValue for good measure).</p> <p>Application_Start method</p> <pre><code>protected void Application_Start() { RegisterRoutes(RouteTable.Routes); ModelBinders.Binders.DefaultBinder = new Microsoft.Web.Mvc.DataAnnotations.DataAnnotationsModelBinder(); //set dataanooations to be used DefaultModelBinder.ResourceClassKey = "Messages"; //set data annotations to look in messages.resx for the default messages ValidationExtensions.ResourceClassKey = "Messages"; } </code></pre> <p>Entity Class</p> <pre><code>[MetadataType(typeof(GLMetaData))] public partial class GL { } public class GLMetaData { public int TransRefId { get; set; } [DisplayName("Process Order")] public int? ProcessOrder { get; set; } [DisplayName("Trans Type")] [StringLength(50)] public string TransType { get; set; } [StringLength(100)] public string Description { get; set; } [DisplayName("GL Code")] [StringLength(20)] public string GLCode { get; set; } [DisplayName("Agents Credit No")] [StringLength(50)] public string AgentsCreditNo { get; set; } [Required] public bool Active { get; set; } } </code></pre> <p>Controller Action:</p> <pre><code> [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(GL glToBeUpdated) { try { if (!ModelState.IsValid) return View(glToBeUpdated); //set auto properties glToBeUpdated.UpdateDate = DateTime.Now; glToBeUpdated.UpdateUser = this.CurrentUser; glDataLayer.update(glToBeUpdated); glDataLayer.submitChanges(); return RedirectToAction("Index"); } catch { glDataLayer.abortChanges(); throw; } } </code></pre>
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    1. COcode for us to review?
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    2. CODid you get it working? Same issue here...
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    3. CONo. I switched to primarily client side validation (mainly via the jquery alphanumeric plugin) with server side validation in the backend without the fully descriptive error messages as a fallback. The users of this system are all internal to my company and I can make sure they always have javascript enabled so the back end validation is just a security measure so doesn't need nice error messages.
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