init

KretaWeb/Helpers/RequiredIfReflector.cs

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+using System.Collections.Generic;
+using System.Web.Mvc;
+
+namespace Kreta.Web.Helpers
+{
+    public static class RequiredIfReflector
+    {
+        public static bool RequiredIf<TModel>(HtmlHelper<TModel> helper, IDictionary<string, object> validationAttributes)
+        {
+            if (validationAttributes.Keys.Contains("data-val-requiredif-dependentproperty") && validationAttributes.Keys.Contains("data-val-requiredif-dependentvalue"))
+            {
+                string dependentPropertyName = (string)validationAttributes["data-val-requiredif-dependentproperty"];
+
+                object requiredValue = validationAttributes["data-val-requiredif-dependentvalue"];
+
+                var propertyInfo = helper.ViewData.Model.GetType().GetProperty(dependentPropertyName);
+
+                object dependentPropertyValue = propertyInfo.GetValue(helper.ViewData.Model);
+
+                return requiredValue.Equals(dependentPropertyValue);
+            }
+            return false;
+        }
+    }
+}