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Page Revision: Tue, Sep 11, 2012, 7:51 AM

Overview¶

This article outlines how to implement the CustomValidation attribute on a view model.

=Walk-Through¶

using System.ComponentModel.DataAnnotations;
. . .
[CustomValidation(typeof(MyViewModelValidator), "ValidateZipCode")]
public string ZipCode { get; set; }

public class ClaimCheckRequestViewModelValidator { public static ValidationResult ValidateZipCode(string input) { return ValidationProvider.ValidateZipCodeExt(input, "Vendor ZIP code"); } }

public class ValidationProvider { //== ZIP Code ============================================================================= public static DA.ValidationResult ValidateZipCode(string zipCode) { return ValidateZipCodeExt(zipCode, "ZIP code"); } public static DA.ValidationResult ValidateZipCodeExt(string zipCode, string fieldName) { string pattern = @"^\d{5}"; return ValidateViaRegex(fieldName, zipCode, pattern); }

//== Private Functions ==================================================================== private static DA.ValidationResult ValidateViaRegex(string fieldName, string fieldValue, string pattern) { if (fieldValue == null) return DA.ValidationResult.Success;

Regex regex = new Regex(pattern); MatchCollection mc = regex.Matches(fieldValue);

if (mc.Count == 1) return DA.ValidationResult.Success; else return new DA.ValidationResult("'" + fieldValue + "' is not a valid " + fieldName); }

} @@