How to make GridView respect validation attributes in buddy class

[Calvin]

How does one get the GridView to detect property validation attribute violations when they are specified in a buddy class?  For example, the property attributes in the buddy class below are not respected by the GridView.  I.e., the grid doesn't indicate a validation error for and it permits entry of a part number that doesn't match the regex. By contrast, the GridView does respect the IValidatableObject.Validate method.  I've tried making the PartMetadata class public; but it still didn't validate.

Any ideas?  thanks!

[MetadataType(typeof(Part.PartMetadata))]

public partial class Part : IValidatableObject {

 

    private sealed class PartMetadata {

        [RegularExpression(@"[0-9A-F]{4,20}")] // Not respected by the RadGridView 

        public string PartNumber { get; set; }

    }

 

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) {

        if (PartNumber == DrawingNumber) { 

            yield return new ValidationResult("part number = drawing number", new string[] { "PartNumber", "DrawingNumber" });

        }

    }

}

[Nedyalko Nikolov]

Hello,

RadGridView validates business objects and its properties via System.ComponentModel.DataAnnotations.Validator class which does not support MetadataType attributes natively. For more information you can take a look at this post.
Indeed RadGridView respects IValidatableObject - for the time being only after row edit is committed, but very soon RadGridView will support such validation in view mode too.

Greetings,
Nedyalko Nikolov
the Telerik team