/// <summary>
/// Merges the specified messages.
/// </summary>
/// <param name="validationSource">The validation source.</param>
/// <param name="propertyName">Name of the property.</param>
/// <returns>
/// The merged message.
/// </returns>
public MergedValidationMessage Merge(IValidatable validationSource, string propertyName = null)
{
validationSource.CannotBeNull();
ValidationMessageCollection messages = new ValidationMessageCollection();
if (propertyName == null)
{
foreach (var validationMessage in this)
{
if (validationMessage.ValidationSource == validationSource)
{
messages.Add(validationMessage);
}
}
}
else
{
foreach (var validationMessage in this)
{
if (validationMessage.ValidationSource == validationSource &&
validationMessage.PropertyName == propertyName)
{
messages.Add(validationMessage);
}
}
}
return(Merge(messages));
}
/// <summary>
/// Validates the specified property of the specified validation source for the specified property value in specified validation context by using validation attributes.
/// </summary>
/// <param name="validationSource">The validation source.</param>
/// <param name="propertyName">The property name.</param>
/// <param name="propertyValue">The property value.</param>
/// <param name="validationContext">The validation context.</param>
/// <returns>
/// The collection of validation mesasges.
/// </returns>
public static ValidationMessageCollection ValidateAttributes(this IValidatable validationSource, string propertyName, object propertyValue, string validationContext)
{
validationSource.CannotBeNull();
propertyName.CannotBeNullOrEmpty();
ValidationMessageCollection messages = new ValidationMessageCollection();
var validationAttributes = ReflectionExtensions.GetProperties(validationSource.GetType())[propertyName].ValidationAttributes;
bool isValid;
// perform attribute based validation
foreach (var validationAttribute in validationAttributes)
{
// only matching validation context gets validated
if (validationAttribute.ValidationContext == validationContext)
{
// custom validators might cause exceptions that are hard to find
try
{
isValid = validationAttribute.IsValid(propertyValue);
}
catch (Exception ex)
{
throw new ValidationErrorException("Unhandled validation exception occurred.", validationAttribute.GetType(), validationSource.GetType(), propertyName, ex);
}
if (!isValid)
{
var messageKey = validationAttribute.MessageKey ?? validationAttribute.GetDefaultMessageKey() ?? "UndefinedMessageKey";
var message = validationAttribute.Message ?? validationAttribute.GetDefaultMessage() ?? "Undefined message.";
var messageParameters = validationAttribute.MessageParameters;
var validationLevel = validationAttribute.ValidationLevel;
var validationPriority = validationAttribute.ValidationPriority;
// value is invalid -> add it to the list
messages.Add(new ValidationMessage(messageKey, message, messageParameters, validationSource, propertyName, validationLevel, validationContext, validationPriority));
}
}
}
return(messages);
}
