/// <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>
/// Inserts avalidation message at the specified index.
/// </summary>
/// <param name="index">The index.</param>
/// <param name="message">The message.</param>
public new void Insert(int index, ValidationMessage message)
{
index.MustBeBetween(0, this.Count);
message.CannotBeNull();
ValidationMessageCollection messages = this[message.ValidationSource, message.PropertyName, message.ValidationContext];
if (messages != null &&
messages.Count > 0)
{
// insert only if there are no messages with higher validation level for this property
if (!messages.Any(x => x.ValidationLevel > message.ValidationLevel))
{
// remove messages with lower priority
foreach (var lowerPriorityMessage in messages.Where(x => x.ValidationLevel < message.ValidationLevel))
{
this.Remove(lowerPriorityMessage);
}
// insert message
base.Insert(Math.Min(this.Count, index), message);
}
}
else
{
base.Insert(index, message);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ValidationException" /> class.
/// </summary>
/// <param name="validationMessages">The validation messages.</param>
public ValidationException(ValidationMessageCollection validationMessages)
: this()
{
validationMessages.CannotBeNull();
this.ValidaitonMessages = validationMessages;
}
/// <summary>
/// Validates the specified property of the specified validation source.
/// </summary>
/// <param name="validationSource">The validation source.</param>
/// <param name="propertyName">Name of the property.</param>
/// <returns>The collection of validation mesasges.</returns>
public static ValidationMessageCollection Validate(this IValidatable validationSource, string propertyName)
{
validationSource.CannotBeNull();
propertyName.CannotBeNullOrEmpty();
ValidationMessageCollection messages = new ValidationMessageCollection();
List <string> validationContexts;
object propertyValue;
// get property value
var properties = ReflectionExtensions.GetProperties(validationSource.GetType());
if (properties.TryGetValue(propertyName, out PropertyData propertyData))
{
if (propertyData.PropertyInfo.CanRead &&
propertyData.PropertyInfo.CanWrite)
{
propertyValue = propertyData.PropertyInfo.GetValue(validationSource);
// get validation context
validationContexts = new List <string>();
validationContexts.Add(ValidationContext.Default); // always add the default validation context
validationContexts.AddRange(validationSource.GetActiveValidationContexts() ?? Array.Empty <string>()); // add currently active validation context
foreach (var validationContext in validationContexts.Distinct())
{
messages.AddRange(validationSource.Validate(propertyName, propertyValue, validationContext));
}
}
}
return(messages);
}
/// <summary>
/// Validates the the specified validation source.
/// </summary>
/// <param name="validationSource">The validation source.</param>
/// <returns>
/// The collection of validation mesasges.
/// </returns>
public static ValidationMessageCollection Validate(this IValidatable validationSource)
{
validationSource.CannotBeNull();
ValidationMessageCollection messages = new ValidationMessageCollection();
var propertyNames = ReflectionExtensions.GetProperties(validationSource.GetType()).Keys;
foreach (var propertyName in propertyNames)
{
messages.AddRange(validationSource.Validate(propertyName));
}
return(messages);
}
/// <summary>
/// Merges the specified messages.
/// </summary>
/// <param name="list">The validation message list.</param>
/// <returns>Merged message.</returns>
private static MergedValidationMessage Merge(ValidationMessageCollection list)
{
ValidationLevel validationLevel;
int validationPriortiy = int.MaxValue;
HashSet <string> messages = new HashSet <string>();
if (list == null ||
list.Count == 0)
{
validationLevel = ValidationLevel.None;
}
else if (list.Count == 1)
{
messages.Add(list[0].Message);
validationLevel = list[0].ValidationLevel;
}
else
{
validationLevel = ValidationLevel.None;
// find max validation level
foreach (ValidationMessage vm in list)
{
validationLevel = (int)vm.ValidationLevel > (int)validationLevel ? vm.ValidationLevel : validationLevel;
}
// find max validation priority
foreach (ValidationMessage vm in list.Where(x => x.ValidationLevel == validationLevel))
{
validationPriortiy = vm.ValidationPriority < validationPriortiy ? vm.ValidationPriority : validationPriortiy;
}
// select only messages for that level
foreach (ValidationMessage vm in list.Where(x => x.ValidationLevel == validationLevel &&
x.ValidationPriority == validationPriortiy))
{
if (!messages.Contains(vm.Message))
{
// prevent duplicates
messages.Add(vm.Message);
}
}
}
return(new MergedValidationMessage(validationLevel, 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);
}
