public static IValidationRule AddRequiredRule([NotNull] this ValidationHelper validator,
[NotNull] Expression <Func <object> > propertyExpression, [NotNull] string errorMessage)
{
Guard.NotNull(validator, nameof(validator));
Guard.NotNull(propertyExpression, nameof(propertyExpression));
Guard.NotNullOrEmpty(errorMessage, nameof(errorMessage));
Func <object> propertyGetter = propertyExpression.Compile();
return(validator.AddRule(PropertyName.For(propertyExpression, false), () =>
{
object propertyValue = propertyGetter();
var stringPropertyValue = propertyValue as string;
if (propertyValue == null || (stringPropertyValue != null && string.IsNullOrEmpty(stringPropertyValue)))
{
return RuleResult.Invalid(errorMessage);
}
return RuleResult.Valid();
}));
}
public static IValidationRule AddRequiredRule([NotNull] this ValidationHelper validator,
[NotNull] Expression <Func <object> > propertyExpression, [NotNull] string errorMessage)
{
Contract.Requires(validator != null);
Contract.Requires(propertyExpression != null);
Contract.Requires(!string.IsNullOrEmpty(errorMessage));
Contract.Ensures(Contract.Result <IValidationRule>() != null);
Func <object> propertyGetter = propertyExpression.Compile();
return(validator.AddRule(propertyExpression, () =>
{
object propertyValue = propertyGetter();
var stringPropertyValue = propertyValue as string;
if (propertyValue == null || (stringPropertyValue != null && string.IsNullOrEmpty(stringPropertyValue)))
{
return RuleResult.Invalid(errorMessage);
}
return RuleResult.Valid();
}));
}