/// <summary>
/// Enumerates the current validation results for the specified object.
/// </summary>
/// <param name="obj">The object for which validation results are needed.</param>
/// <returns>The validation results.</returns>
public IEnumerable <ValidationResult> EnumerateValidationResults(ISupportValidation obj)
{
HashCollection <ValidationResult> validationResults;
if (this.validationResults.TryGetValue(obj, out validationResults))
{
foreach (ValidationResult validationResult in validationResults)
{
yield return(validationResult);
}
}
}
private void OnPropertyChanged(ModelObject sender, UndoablePropertyChangedEventArgs args)
{
ISupportValidation obj = sender as ISupportValidation;
if (obj != null)
{
PropertyDescriptor propertyDescriptor = Utilities.GetPropertyDescriptor(sender, args.PropertyName);
if (propertyDescriptor.Attributes.Contains(AffectsValidityAttribute.Yes))
{
this.BeginValidation(obj);
}
}
}
internal static void Validate(this ISupportValidation validating, string subject)
{
try
{
validating.Validate();
}
catch (Exception exception)
{
if (exception.IsFatal())
{
throw;
}
throw new BindingException(string.Format("{0} is not valid: {1}.", subject, exception.Message), exception);
}
}
/// <summary>
/// Starts a complete validation of the specified data object.
/// </summary>
/// <param name="obj">The object to validate.</param>
protected void BeginValidation(ISupportValidation obj)
{
if (obj != null)
{
lock (this.validationQueue)
{
if (!this.validationQueue.Contains(obj))
{
this.validationQueue.Add(obj);
this.Status = ValidationStatus.Validating;
this.queueResetEvent.Set();
}
}
}
}
internal static void Validate(this ISupportValidation validating, string subject)
{
try
{
validating.Validate();
}
catch (Exception exception) when(!exception.IsFatal())
{
var message = $"{subject} is not valid: {exception.Message}";
if (!message.EndsWith("."))
{
message += ".";
}
throw new BindingException(message, exception);
}
}
private void RegisterModelObject(ModelObject modelObject)
{
lock (this.registeredObjects)
{
// Make sure the ModelObject hasn't already been processed
if (modelObject != null && !this.registeredObjects.Contains(modelObject))
{
// Add the object to the list of already processed objects
this.registeredObjects.Add(modelObject);
// Add the object to the validation manager
ISupportValidation obj = modelObject as ISupportValidation;
if (obj != null)
{
this.AddObject(obj);
this.BeginValidation(obj);
}
// Examine the properties of the ModelObject to look for more ModelObjects to process
foreach (PropertyDescriptor propertyDescriptor in TypeDescriptor.GetProperties(modelObject))
{
// Check if the property itself is a ModelObject
if (propertyDescriptor.PropertyType.IsSubclassOf(typeof(ModelObject)))
{
// Recurse on the ModelObject property
this.RegisterModelObject((ModelObject)propertyDescriptor.GetValue(modelObject));
}
// Check if the property is a collection of child ModelObjects
else if (typeof(IEnumerable).IsAssignableFrom(propertyDescriptor.PropertyType))
{
INotifyingCollection notifyingCollection = propertyDescriptor.GetValue(modelObject) as INotifyingCollection;
if (notifyingCollection != null)
{
// Recurse on ModelObject children
foreach (object childObject in notifyingCollection)
{
this.RegisterModelObject(childObject as ModelObject);
}
}
}
}
}
}
}
/// <summary>
/// Adds an object to the Validation Manager.
/// </summary>
/// <param name="obj">The object to add.</param>
protected void AddObject(ISupportValidation obj)
{
lock (this.objects)
{
lock (this.validationResults)
{
if (!this.objects.Contains(obj))
{
this.objects.Add(obj);
ISupportValidationNotification notifyValidityAffected = obj as ISupportValidationNotification;
if (notifyValidityAffected != null)
{
notifyValidityAffected.ValidityAffected += this.OnValidityAffected;
}
this.validationResults.Add(obj, new HashCollection <ValidationResult> ());
}
}
}
}
protected bool ValidateProperty(object value, string propertyName)
{
var validationResults = ValidationHelper.ValidateProperty(this, value, propertyName);
ISupportValidation validation = this;
validation.OnPropertyValidating(value, propertyName, validationResults);
if (validationResults.Count > 0)
{
AddErrors(propertyName, validationResults);
}
else
{
ClearErrors(propertyName);
}
RaiseErrorsChanged(propertyName);
validation.OnPropertyValidated(propertyName);
return(!Errors.ContainsKey(propertyName) || Errors[propertyName].Count == 0);
}
/// <summary>
/// Removes an object from the Validation Manager.
/// </summary>
/// <param name="obj">The object to be removed.</param>
protected void RemoveObject(ISupportValidation obj)
{
lock (this.objects)
{
lock (this.validationResults)
{
lock (this.validationQueue)
{
if (this.objects.Contains(obj))
{
this.objects.Remove(obj);
ISupportValidationNotification notifyValidityAffected = obj as ISupportValidationNotification;
if (notifyValidityAffected != null)
{
notifyValidityAffected.ValidityAffected -= this.OnValidityAffected;
}
HashCollection <ValidationResult> validationResults = this.validationResults[obj];
foreach (ValidationResult validationResult in new List <ValidationResult> (validationResults))
{
validationResults.Remove(validationResult);
ValidationResult currentValidationResult = validationResult;
SendOrPostCallback raiseRemovedEvent = delegate
{
this.RaiseValidationResultRemovedEvent(currentValidationResult);
};
this.asyncOperation.Post(raiseRemovedEvent, null);
}
this.validationResults.Remove(obj);
if (this.validationQueue.Contains(obj))
{
this.validationQueue.Remove(obj);
}
}
}
}
}
}
private void BeginValidation()
{
ThreadStart beginValidation = delegate
{
while (true)
{
// Wait if there is no work to do
this.queueResetEvent.WaitOne();
ISupportValidation obj = null;
lock (this.validationQueue)
{
if (this.validationQueue.Count == 0)
{
this.Status = ValidationStatus.Ready;
this.queueResetEvent.Reset();
continue;
}
else
{
obj = this.validationQueue[0];
this.validationQueue.RemoveAt(0);
}
}
lock (this.validationResults)
{
// Try to get the validation results (they may have been removed by a different
// thread calling RemoveObject)
HashCollection <ValidationResult> oldValidationResults;
if (this.validationResults.TryGetValue(obj, out oldValidationResults))
{
HashCollection <ValidationResult> newValidationResults = new HashCollection <ValidationResult> ();
foreach (ValidationResult validationResult in obj.Validate())
{
if (!newValidationResults.Contains(validationResult))
{
newValidationResults.Add(validationResult);
}
}
foreach (ValidationResult validationResult in new List <ValidationResult> (oldValidationResults))
{
if (!newValidationResults.Contains(validationResult))
{
oldValidationResults.Remove(validationResult);
ValidationResult currentValidationResult = validationResult;
SendOrPostCallback raiseRemovedEvent = delegate
{
this.RaiseValidationResultRemovedEvent(currentValidationResult);
};
this.asyncOperation.Post(raiseRemovedEvent, null);
}
}
foreach (ValidationResult validationResult in newValidationResults)
{
if (!oldValidationResults.Contains(validationResult))
{
oldValidationResults.Add(validationResult);
ValidationResult currentValidationResult = validationResult;
SendOrPostCallback raiseAddedEvent = delegate
{
this.RaiseValidationResultAddedEvent(currentValidationResult);
};
this.asyncOperation.Post(raiseAddedEvent, null);
}
}
}
}
}
};
Thread thread = new Thread(beginValidation);
thread.Name = "Validation Manager";
thread.IsBackground = true;
thread.Priority = ThreadPriority.BelowNormal;
thread.Start();
}
internal static void ClearErrors(System.Collections.Generic.IDictionary <string, HashSet <string> > errors, ISupportValidation isv, string propertyName)
{
errors.Remove(propertyName);
Execute.OnUIThread(() =>
{
isv.RaiseErrorsChanged(propertyName);
});
}
internal static void ClearErrors(System.Collections.Generic.IDictionary <string, HashSet <string> > errors, ISupportValidation isv)
{
var keys = errors.Keys.ToList();
errors.Clear();
Execute.OnUIThread(() =>
{
foreach (var key in keys)
{
isv.RaiseErrorsChanged(key);
}
});
}
