private static string GetDisplayNameForProperty(Type containerType, string propertyName)
{
var propertyDescriptor = RequiredIfCheckedAttribute.GetTypeDescriptor(containerType).GetProperties().Find(propertyName, true);
if (propertyDescriptor == null)
{
var errorMessage = string.Format(CultureInfo.CurrentCulture, "Property {1} not found in {0}",
containerType.FullName,
propertyName);
throw new ArgumentException(errorMessage);
}
var enumerable = propertyDescriptor.Attributes.Cast <Attribute>().ToList();
var displayAttribute = enumerable.OfType <DisplayAttribute>().FirstOrDefault();
if (displayAttribute != null)
{
return(displayAttribute.GetName());
}
var displayNameAttribute = enumerable.OfType <DisplayNameAttribute>().FirstOrDefault();
return(displayNameAttribute != null ? displayNameAttribute.DisplayName : propertyName);
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var errorMessage = string.Format(CultureInfo.CurrentCulture, "Unknown property: {0}", this.OtherProperty);
var property = validationContext.ObjectType.GetProperty(this.OtherProperty);
if (property == null)
{
return(new ValidationResult(errorMessage));
}
var isCheckedAsObject = property.GetValue(validationContext.ObjectInstance, null);
if (isCheckedAsObject == null)
{
return(new ValidationResult(errorMessage));
}
var isCheckedAsString = isCheckedAsObject.ToString();
var isChecked = false;
if (bool.TryParse(isCheckedAsString, out isChecked))
{
if (isChecked)
{
return(value == null
? new ValidationResult(this.FormatErrorMessage(validationContext.DisplayName))
: null);
}
}
else
{
return(new ValidationResult(errorMessage));
}
if (this.OtherPropertyDisplayName == null)
{
this.OtherPropertyDisplayName = RequiredIfCheckedAttribute.GetDisplayNameForProperty(validationContext.ObjectType, this.OtherProperty);
}
return(new ValidationResult(this.FormatErrorMessage(validationContext.DisplayName)));
}