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POASPNET MVC - Why is ModelState.IsValid false "The x field is required" when that field does have a value?
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  1. POASPNET MVC - Why is ModelState.IsValid false "The x field is required" when that field does have a value?
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    copied!<p>I have a model like this:</p> <pre><code>public PurchaseOrder { [Required] [StringLength(15)] public virtual string OrderNumber {get;set;} // etc. } </code></pre> <p>When I submit an order from the view (using $.post, not input type=submit) it goes to my controller class:</p> <pre><code>public class PurchaseOrderController { public JsonResult Save(PurchaseOrder order) { // TryUpdateModel(order); // commented out since modelstate.isvalid remains false anyway if (ModelState.IsValid) { // its never valid } } } </code></pre> <p>ModelState.IsValid always returns false, with the error: "The Order Number field is required." But there is a value in this field (?? why) </p> <p>Why would it say "value is required" when it does have a value? Have I missed something? Is it because of the $.post instead of the submit? What can I do?</p> <p>This is what the debugger looks like:</p> <p><a href="http://www.freeimagehosting.net/uploads/f734f3d95d.png" rel="nofollow noreferrer">alt text http://www.freeimagehosting.net/uploads/f734f3d95d.png</a></p> <p><strong>EDIT: Extra info....</strong></p> <p>I really think that for some reason the model binding is not happening. When I try this code found here: )</p> <pre><code>if (!ModelState.IsValid) { ModelState.Clear(); ModelMetadata modelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() =&gt; order, order.GetType()); ModelValidator compositeValidator = ModelValidator.GetModelValidator(modelMetadata, base.ControllerContext); foreach (ModelValidationResult result in compositeValidator.Validate(null)) { this.ModelState.AddModelError(result.MemberName, result.Message); } } </code></pre> <p>Then ModelState.IsValid = true. compositeValidator.Validate() returns 0 errors. I think this indicates the model was not bound, but I still don't know why.</p> <p>The controller method actually looks like this (I missed out the filter when originally writing this question)</p> <pre><code>[JsonFilter(Param = "order", JsonDataType = typeof(PurchaseOrder))] public JsonResult Save(PurchaseOrder order) { // etc ... } </code></pre> <p>And the JsonFilter does this to extract the POCO from the json submitted data:</p> <pre><code>filterContext.ActionParameters[Param] = jsSerializer.Deserialize(inputContent, JsonDataType); </code></pre> <p>I put a breakpoint on this line, and order is valid, plus order.OrderNumber has the correct value.</p> <p>So still unresolved, but hopefully this extra info will help with finding a solution </p>
 

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