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|
public class ValidationViewModel<TModel> : INotifyPropertyChanged, INotifyDataErrorInfo
where TModel : WCFContract
{
#region Fields
private readonly List<PropertyValidation<TModel>> _validations = new List<PropertyValidation<TModel>>();
private Dictionary<string, List<string>> _errorMessages = new Dictionary<string, List<string>>();
private TModel _model;
#endregion
public TModel Model
{
get { return _model; }
set { SetModel(value); }
}
private void SetModel(TModel value)
{
if (value != null)
{
CreateValidation(value.Rules);
if(_model != value)
{
_model = value;
//On s'abonne au PropertyCHanged de tous les descendant
NotifyPropertyChangedHelper.SetupPropertyChanged(_model, (s, e) => { ValidateProperty(s, e.PropertyName); });
OnPropertyChanged("Model")
}
}
}
protected ValidationViewModel()
{
PropertyChanged += (s, e) => { if (e.PropertyName != "HasErrors") ValidateProperty(s, e.PropertyName); };
}
private void CreateValidation(ObservableCollection<Rule> rules)
{
if (rules == null || rules.Count == 0)
return;
ValidationBase<TModel> valid = null;
foreach (var rule in rules)
{
var validation = AddValidationFor(rule.PropertyName);
switch (rule.ValidationType)
{
case ValidationType.String:
var sr = rule as StringRule;
if (sr != null)
{
valid = new StringValidation<TModel>(sr.MinLength, sr.MaxLength);
valid.PropertyName = rule.PropertyName;
validation.When(valid.GetCompareFunction())
.Show(sr.Message);
}
break;
}
}
}
#region INotifyDataErrorInfo
public IEnumerable GetErrors(string propertyName)
{
if (_errorMessages.ContainsKey(propertyName))
return _errorMessages[propertyName];
return new string[0];
}
public bool HasErrors
{
get { return _errorMessages.Count > 0; }
}
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { };
private void OnErrorsChanged(string propertyName)
{
ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
}
#endregion
protected PropertyValidation<TModel> AddValidationFor(Expression<Func<object>> expression)
{
return AddValidationFor(ExpressionHelper.GetPropertyName(expression));
}
protected PropertyValidation<TModel> AddValidationFor(string propertyName)
{
var validation = new PropertyValidation<TModel>(propertyName);
_validations.Add(validation);
return validation;
}
protected void AddAllAttributeValidators()
{
PropertyInfo[] propertyInfos = GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (PropertyInfo propertyInfo in propertyInfos)
{
Attribute[] custom = Attribute.GetCustomAttributes(propertyInfo, typeof(ValidationAttribute), true);
foreach (var attribute in custom)
{
var property = propertyInfo;
var validationAttribute = attribute as ValidationAttribute;
if (validationAttribute == null)
throw new NotSupportedException("validationAttribute variable should be inherited from ValidationAttribute type");
string name = property.Name;
var displayAttribute = Attribute.GetCustomAttributes(propertyInfo, typeof(DisplayAttribute)).FirstOrDefault() as DisplayAttribute;
if (displayAttribute != null)
{
name = displayAttribute.GetName();
}
var message = validationAttribute.FormatErrorMessage(name);
AddValidationFor(propertyInfo.Name)
.When(x =>
{
var value = property.GetGetMethod().Invoke(this, new object[] { });
var result = validationAttribute.GetValidationResult(value,
new ValidationContext(this, null, null) { MemberName = property.Name });
return result != ValidationResult.Success;
})
.Show(message);
}
}
}
public void ValidateAll()
{
var propertyNamesWithValidationErrors = _errorMessages.Keys;
_errorMessages = new Dictionary<string, List<string>>();
_validations.ForEach(PerformValidation);
var propertyNamesThatMightHaveChangedValidation =
_errorMessages.Keys.Union(propertyNamesWithValidationErrors).ToList();
propertyNamesThatMightHaveChangedValidation.ForEach(OnErrorsChanged);
OnPropertyChanged("HasErrors");
}
public void ValidateProperty(object sender, Expression<Func<object>> expression)
{
ValidateProperty(sender, ExpressionHelper.GetPropertyName(expression));
}
private void ValidateProperty(object sender, string propertyName)
{
_errorMessages.Remove(propertyName);
_validations.Where(v => v.PropertyName == propertyName).ToList().ForEach(PerformValidation);
OnErrorsChanged(propertyName);
OnPropertyChanged("HasErrors");
}
private void PerformValidation(PropertyValidation<TModel> validation)
{
if (validation.IsInvalid((TModel)this.Model))
{
AddErrorMessageForProperty(validation.PropertyName, validation.GetErrorMessage());
}
}
private void AddErrorMessageForProperty(string propertyName, string errorMessage)
{
if (_errorMessages.ContainsKey(propertyName))
{
_errorMessages[propertyName].Add(errorMessage);
}
else
{
_errorMessages.Add(propertyName, new List<string> { errorMessage });
}
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged.UISafeInvoke(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
} |
Validation en Silverlight
. Je vous expose le problème
), il faudrait que mon objet WCFContract implément INotifyDataErrorInfo pour que cela marche, seul problème, cette objet est généré par le service référence vers notre WCF service
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