/// <summary>
/// Gets the validation errors for a specified property or for the entire object.
/// </summary>
/// <param name="propertyName">The name of the property to retrieve validation errors for, or null or <see cref="F:System.String.Empty"/> to retrieve errors for the entire object.</param>
/// <returns>
/// The validation errors for the property or object.
/// </returns>
IEnumerable INotifyDataErrorInfo.GetErrors(string propertyName)
{
if (HideValidationResults)
{
yield return(null);
}
if (string.IsNullOrEmpty(propertyName))
{
lock (ValidationContext)
{
foreach (var error in ValidationContext.GetBusinessRuleErrors())
{
yield return(error.Message);
}
}
}
else
{
lock (ValidationContext)
{
foreach (var error in ValidationContext.GetFieldErrors(propertyName))
{
yield return(error.Message);
}
}
}
}
/// <summary>
/// Gets an error for a specific column.
/// </summary>
/// <param name="columnName">Column name.</param>
/// <returns>The error or <see cref="string.Empty"/> if no error is available.</returns>
string IDataErrorInfo.this[string columnName]
{
get
{
if (string.IsNullOrEmpty(columnName))
{
return(string.Empty);
}
if (HideValidationResults)
{
return(string.Empty);
}
if (!IsValidated && AutomaticallyValidateOnPropertyChanged)
{
Validate();
}
var error = (from fieldError in ValidationContext.GetFieldErrors(columnName)
select fieldError.Message).FirstOrDefault();
return(error ?? string.Empty);
}
}
/// <summary>
/// Gets the validation errors for a specified property or for the entire object.
/// </summary>
/// <param name="propertyName">The name of the property to retrieve validation errors for, or null or <see cref="F:System.String.Empty"/> to retrieve errors for the entire object.</param>
/// <returns>
/// The validation errors for the property or object.
/// </returns>
IEnumerable INotifyDataErrorInfo.GetErrors(string propertyName)
{
var elements = new List <string>();
if (HideValidationResults)
{
return(elements);
}
if (string.IsNullOrEmpty(propertyName))
{
lock (_validationContext)
{
foreach (var error in _validationContext.GetBusinessRuleErrors())
{
elements.Add(error.Message);
}
}
}
else
{
lock (_validationContext)
{
foreach (var error in _validationContext.GetFieldErrors(propertyName))
{
elements.Add(error.Message);
}
}
}
return(elements);
}
public void ReturnsRightValidationsForEmptyContextWithTagAndPropertyName()
{
var context = new ValidationContext();
var fieldValidations = context.GetFieldErrors("MyProperty");
Assert.AreEqual(0, fieldValidations.Count);
}
public void ReturnsRightValidationsForEmptyContext()
{
var context = new ValidationContext();
var fieldValidations = context.GetFieldErrors();
Assert.AreEqual(0, fieldValidations.Count);
}
