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Kreta.BusinessLogic/Validation/BLValidator.cs

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+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using Kreta.Core;
+using Kreta.Resources;
+using KretaValidate = Kreta.Core.Validation.Exceptions;
+using KretaValidateEnum = Kreta.Core.Validation.Exceptions.Enum;
+
+namespace Kreta.BusinessLogic.Validation
+{
+    /// <summary>
+    /// Validates the models with "DataAnnotationAttributes" and gives You the option
+    /// to create custom validation if model implements the "IValidatableObject" interface.
+    /// </summary>
+    public class BlValidator
+    {
+        public static implicit operator string(BlValidator blValidator)
+            => blValidator.GetFirstUserFriendlyError();
+
+        public readonly List<ValidationResult> ErrorList = new List<ValidationResult>();
+        public readonly bool IsValid;
+
+        //TODO devkornel: Megcsinálni List<object>-re is vagy Singleton-ra!!!!
+        public BlValidator(object coInstance)
+        {
+            var context = new ValidationContext(coInstance, serviceProvider: null, items: null);
+            IsValid = Validator.TryValidateObject(coInstance, context, ErrorList, true);
+        }
+        public string GetUserFriendlyError()
+            => string.Join(Constants.General.LineSeparator, ErrorList.Select(x => x.ErrorMessage).ToArray());
+        public string GetFirstUserFriendlyError()
+            => ErrorList.Count > 0 ? ErrorList[0].ErrorMessage : string.Empty;
+
+        public KretaValidate.ValidationException ConvertToValidationException()
+        {
+            var validationException = new KretaValidate.ValidationException(KretaValidateEnum.ValidationErrorType.Undefined, ErrorResource.ValidaciosHiba);
+            var count = 1;
+            foreach (var error in ErrorList)
+            {
+                var name = error.MemberNames.FirstOrDefault() ?? "custom_" + count;
+                validationException.AddValidationItem(new KretaValidate.ValidationExceptionItem(name, error.ErrorMessage));
+                count++;
+            }
+
+            return validationException;
+        }
+    }
+}