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POHandling Data Annotation Validation with Custom ValidationResult
 

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    <p>I have a custom ValidationAttribute like this :</p> <pre> <code> public class ReceiverRegion : ValidationAttribute { private RegionService regionService; private CityService cityService; public ReceiverRegion() : base("Incorrect region code") { this.regionService = new RegionService(); this.cityService = new CityService(); } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { int regionId = Convert.ToInt32(value); int plate = Convert.ToInt32((validationContext.ObjectInstance as CorporateOrderItem).ReceiverCity); int productGroupId = Convert.ToInt32(validationContext.Items["productGroup"].ToString()); if (!CheckReceiverRegionExistence(regionId, plate, productGroupId)) { IEnumerable regions = this.regionService.GetList(cityService.GetByPlate(plate).PKCityId); return new CorporateOrderValidationResult(base.ErrorMessage, regions.Select(r=>r.Name)); } return <b>CorporateOrderValidationResult.Success</b>; } private bool CheckReceiverRegionExistence(int plate, int regionId, int productGroup) { return !(regionService.GetByCityAndRegionIdForProductGroup(plate, regionId, productGroup) == null); } } </code> </pre> <p>But as you can see in IsValid method, I'm trying to return a custom object which inherits from ValidationResult. My problem is, I can't access the extra members of my <code>CorporateOrderValidationResult</code> instance since IsValid returns the base ValidationResult type. Below is the code where I call validate and get a collection of ValidationResult as return value. </p> <p><pre><code> List results = new List(); bool isValid = Validator.TryValidateObject(instance, context, results, true); </pre></code></p> <p>I tried to cast results object to <code>List&lt;CorporateOrderValidationResult&gt;</code>, but no matter what I try(for instance --> <code>item as CorporateOrderValidationResult</code> or <code>results.OfType&lt;CorporateOrderValidationResult&gt;()</code> or <code>(CorporateOrderValidationResult)item)</code> I either get InvalidCastException or null value. Is there a possible way to convert this list of result to a list of my custom result class? Thanks...</p>
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