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POCustom validation class - How to make universal
 

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    <p>I am attempting to create a custom validation attribute for my MVC application. My code as written, works great for the properties specified in the code. I now want to expand it, so it is more general, because I have 5 other properties I would like to use this same attribute on.<br> The general idea is if the specified other property is true, then the property attached to the attribute must be > 0.</p> <p>I assume the way to do this is to create a constructor that accepts the value of the property and the value of the other property, but I can't seem to get it going. The specific problem I having is I can't find the correct way to pull in the needed values.</p> <p>Here is what I have:</p> <pre><code>public class MustBeGreaterIfTrueAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext context) { var model = context.ObjectInstance as HistoryViewModel; //ValidationResult result = null; // Validate to ensure the model is the correct one if (context.ObjectInstance.GetType().Name == null) { throw new InvalidOperationException(string.Format( CultureInfo.InvariantCulture, "Context of type {0} is not supported. " + "Expected type HistoryViewModel", context.ObjectInstance.GetType().Name)); } // Here is the actual custom rule if (model.HistoryModel.IsRetired == true) { if (model.CounterA == 0) { return new ValidationResult("Please enter more information regarding your History"); } } else if ( model.HistoryModel.IsRetired == true ) { if ( model.ROCounter &gt; 0 ) return ValidationResult.Success; } // If all is ok, return successful. return ValidationResult.Success; } // Add the client side unobtrusive 'data-val' attributes //public IEnumerable&lt;ModelClientValidationRule&gt; GetClientValidationRules(ModelMetadata metadata, ControllerContext context) //{ //} } </code></pre> <p>Thank you for you time.</p>
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