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POAdd validation rule to model property dynamically in asp.net mvc2
 

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  1. POAdd validation rule to model property dynamically in asp.net mvc2
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    <p>one model property validation info/rules are available in the other properties of same model object. i have to validate the property values using other properties values.</p> <p><strong>Model class:-</strong></p> <pre><code> [FormatValidtion("Value", "Format", "MinLength", "MaxLength", ErrorMessage = "Please enter correct format")] public class Sample { #region ModelProperties public string Id { get; set; } [Required(ErrorMessage = "Please Enter Value")] public string Value { get; set; } public string Format { get; set; } public string MinLength { get; set; } public string MaxLength { get; set; } #endregion } </code></pre> <p>Model object looks like above.Here i have to validate <strong>Value</strong> property using the </p> <ul> <li><p><strong>Format</strong> ( Fomart Validation like email,phone &amp; Date)</p></li> <li><p><strong>MinLength,MaxLength</strong> (Range validation) properties.</p></li> </ul> <p>I know we can do this using custom validations like </p> <ol> <li>Create Custom class keeping <strong>ValidationAttribute</strong> as base</li> <li>Pass all these properties( Value ,Format,MinLength &amp; MaxLength)</li> <li>Write switch case with Format property.</li> <li>Validate Format using Regex and do manual range validation or with dynamic Regex validation.</li> </ol> <p><strong>EDIT :- Added Custom Validation Class Code Here</strong></p> <p><strong>Custom Validation Class:</strong></p> <pre><code>[AttributeUsage(AttributeTargets.Class)] public class FormatValidtion : ValidationAttribute { public String Value { get; set; } public String Format { get; set; } public String MinLength { get; set; } public String MaxLength { get; set; } public FormatValidtion(String value, String format, String minLength, String maxLength) { Value = value; Format = format; MinLength = minLength; MaxLength = maxLength; } public override Boolean IsValid(Object value) { Type objectType = value.GetType(); PropertyInfo[] neededProperties = objectType.GetProperties() .Where(p =&gt; p.Name == Value || p.Name == Format || p.Name == MinLength || p.Name == MaxLength) .ToArray(); if (neededProperties.Count() != 4) { throw new ApplicationException("PropertiesMatchAttribute error on " + objectType.Name); } Boolean isMatched = true; switch (Convert.ToString(neededProperties[1].GetValue(value, null))) { case "Alpha": Regex regExAlpha = new Regex(@"/^[A-Za-z]+$/"); if (!regExAlpha.IsMatch(Convert.ToString(neededProperties[0].GetValue(value, null)))) { isMatched = false; } break; case "Number": Regex regExNumber = new Regex(@"/^[0-9]+$/"); if (!regExNumber.IsMatch(Convert.ToString(neededProperties[0].GetValue(value, null)))) { isMatched = false; } break; case "AlphaNum": Regex regExAlphaNum = new Regex(@"/^[a-zA-Z][a-zA-Z0-9]+$/"); if (!regExAlphaNum.IsMatch(Convert.ToString(neededProperties[0].GetValue(value, null)))) { isMatched = false; } break; default: isMatched = false; break; } return isMatched; } } </code></pre> <p>This is working correctly at class level and showing validation messages through validation summary. But I want to modify the above code to do the following things.</p> <ol> <li>Validation should happen at property level or some how need to show error message at property level( using validationMessage helper class).</li> <li>Need to provide the specific error messages for each validation other than common error message.</li> <li>Range validation should happen.</li> </ol> <p>Can anybody provide some thoughts around these?</p>
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