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 RuleResult Combine([NotNull] this RuleResult firstRuleResult, [NotNull] RuleResult secondRuleResult)
{
Contract.Requires(firstRuleResult != null);
Contract.Requires(secondRuleResult != null);
Contract.Ensures(Contract.Result <RuleResult>() != null);
var result = new RuleResult();
foreach (string error in firstRuleResult.Errors)
{
result.AddError(error);
}
foreach (string error in secondRuleResult.Errors)
{
if (!result.Errors.Contains(error))
{
result.AddError(error);
}
}
return(result);
}
public static RuleResult Combine([NotNull] this RuleResult firstRuleResult,
[NotNull] RuleResult secondRuleResult)
{
Guard.NotNull(firstRuleResult, nameof(firstRuleResult));
Guard.NotNull(secondRuleResult, nameof(secondRuleResult));
var result = new RuleResult();
foreach (string error in firstRuleResult.Errors)
{
result.AddError(error);
}
foreach (string error in secondRuleResult.Errors)
{
if (!result.Errors.Contains(error))
{
result.AddError(error);
}
}
return(result);
}
public static IAsyncValidationRule AddChildValidatable([NotNull] this ValidationHelper validator,
[NotNull] Expression <Func <IValidatable> > childValidatableGetter)
{
Contract.Requires(validator != null);
Contract.Requires(childValidatableGetter != null);
Contract.Ensures(Contract.Result <IAsyncValidationRule>() != null);
Func <IValidatable> getter = childValidatableGetter.Compile();
return(validator.AddAsyncRule(PropertyName.For(childValidatableGetter), () =>
{
IValidatable validatable = getter();
if (validatable != null)
{
#if SILVERLIGHT_4
validatable.Validate(result =>
{
#else
return validatable.Validate().ContinueWith(r =>
{
ValidationResult result = r.Result;
#endif
var ruleResult = new RuleResult();
foreach (ValidationError error in result.ErrorList)
{
ruleResult.AddError(error.ErrorText);
}
return ruleResult;
});
}
return Task.Factory.StartNew(() => RuleResult.Valid());
}));
}
private Task <bool> ExecuteNextRuleFromQueueAsync(Queue <ValidationRule> rulesQueue, ISet <object> failedTargets,
ValidationResult validationResultAccumulator, SynchronizationContext syncContext)
{
if (rulesQueue.Count == 0)
{
return(TaskEx.FromResult(false));
}
var rule = rulesQueue.Dequeue();
// Skip rule if the target is already invalid
if (failedTargets.Contains(rule.Target))
{
// Assume that the rule is valid at this point because we are not interested in this error until
// previous rule is fixed.
SaveRuleValidationResultAndNotifyIfNeeded(rule, RuleResult.Valid(), syncContext);
return(TaskEx.FromResult(true));
}
return(ExecuteRuleCoreAsync(rule).ContinueWith(t =>
{
RuleResult ruleResult = t.Result;
SaveRuleValidationResultAndNotifyIfNeeded(rule, ruleResult, syncContext);
AddErrorsFromRuleResult(validationResultAccumulator, rule, ruleResult);
if (!ruleResult.IsValid)
{
failedTargets.Add(rule.Target);
}
return true;
}));
}
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();
}));
}
public static IAsyncValidationRule AddChildValidatableCollection([NotNull] this ValidationHelper validator,
[NotNull] Expression <Func <IEnumerable <IValidatable> > > validatableCollectionGetter)
{
Contract.Requires(validator != null);
Contract.Requires(validatableCollectionGetter != null);
Contract.Ensures(Contract.Result <IAsyncValidationRule>() != null);
Func <IEnumerable <IValidatable> > getter = validatableCollectionGetter.Compile();
return(validator.AddAsyncRule(PropertyName.For(validatableCollectionGetter), () =>
{
IEnumerable <IValidatable> items = getter();
if (items == null)
{
return Task.Factory.StartNew(() => RuleResult.Valid());
}
return Task.Factory.StartNew(() =>
{
var result = new RuleResult();
// Execute validation on all items at the same time, wait for all
// to fininish and combine the results.
var results = new List <ValidationResult>();
var syncEvent = new ManualResetEvent(false);
var itemsArray = items as IValidatable[] ?? items.ToArray();
int[] numerOfThreadsNotYetCompleted = { itemsArray.Length };
foreach (var item in itemsArray)
{
#if SILVERLIGHT_4
item.Validate(r =>
{
Exception ex = null;
#else
item.Validate().ContinueWith(tr =>
{
ValidationResult r = tr.Result;
AggregateException ex = tr.Exception;
#endif
lock (results)
{
// ReSharper disable ConditionIsAlwaysTrueOrFalse
if (ex == null && r != null)
// ReSharper restore ConditionIsAlwaysTrueOrFalse
{
results.Add(r);
}
if (Interlocked.Decrement(ref numerOfThreadsNotYetCompleted[0]) == 0)
{
syncEvent.Set();
}
}
});
}
if (numerOfThreadsNotYetCompleted[0] > 0)
{
// Wait for all items to finish validation
syncEvent.WaitOne();
// Add errors from all validation results
foreach (ValidationResult itemResult in results)
{
foreach (ValidationError error in itemResult.ErrorList)
{
result.AddError(error.ErrorText);
}
}
}
return result;
});
}));
}
public static IAsyncValidationRule AddChildValidatableCollection([NotNull] this ValidationHelper validator,
[NotNull] Expression <Func <IEnumerable <IValidatable> > > validatableCollectionGetter)
{
Guard.NotNull(validator, nameof(validator));
Guard.NotNull(validatableCollectionGetter, nameof(validatableCollectionGetter));
Func <IEnumerable <IValidatable> > getter = validatableCollectionGetter.Compile();
return(validator.AddAsyncRule(PropertyName.For(validatableCollectionGetter), () =>
{
IEnumerable <IValidatable> items = getter();
if (items == null)
{
return TaskEx.FromResult(RuleResult.Valid());
}
items = items as IValidatable[] ?? items.ToArray();
if (!items.Any())
{
return TaskEx.FromResult(RuleResult.Valid());
}
var result = new RuleResult();
// Execute validation on all items at the same time, wait for all
// to finish and combine the results.
var results = new List <ValidationResult>();
var tasks = new List <Task <ValidationResult> >();
foreach (var item in items)
{
var task = item.Validate().ContinueWith(tr =>
{
ValidationResult r = tr.Result;
AggregateException ex = tr.Exception;
lock (results)
{
if (ex == null && r != null)
{
results.Add(r);
}
}
return tr.Result;
});
tasks.Add(task);
}
var resultTask = TaskEx.WhenAll(tasks).ContinueWith(tr =>
{
if (tr.Exception == null)
{
// Add errors from all validation results
foreach (ValidationResult itemResult in results)
{
foreach (ValidationError error in itemResult.ErrorList)
{
result.AddError(error.ErrorText);
}
}
return result;
}
throw new AggregateException(tr.Exception);
});
return resultTask;
}));
}