Windows Dev Center

The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

NotifyDataErrorValidationRule Class

.NET Framework 4.6 and 4.5

Represents a rule that checks for errors that are raised by a data source that implements INotifyDataErrorInfo.


Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public sealed class NotifyDataErrorValidationRule : ValidationRule
<NotifyDataErrorValidationRule .../>

The NotifyDataErrorValidationRule type exposes the following members.

Public methodNotifyDataErrorValidationRuleCreates a new instance of the NotifyDataErrorValidationRule class.

Public propertyValidatesOnTargetUpdatedGets or sets a value that indicates whether the validation rule runs when the target of the Binding is updated. (Inherited from ValidationRule.)
Public propertyValidationStepGets or sets when the validation rule runs. (Inherited from ValidationRule.)

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodValidate(Object, CultureInfo)Performs validation checks on a value. (Overrides ValidationRule.Validate(Object, CultureInfo).)
Public methodValidate(Object, CultureInfo, BindingExpressionBase)Performs validation checks on a value. (Inherited from ValidationRule.)
Public methodValidate(Object, CultureInfo, BindingGroup)Performs validation checks on a value. (Inherited from ValidationRule.)

The WPF data binding model enables you to associate ValidationRules with a Binding or BindingGroup object. The NotifyDataErrorValidationRule class is a built-in rule that checks for exceptions that are thrown during the updates of the binding source property. You can provide custom logic to specify how the binding engine handles these exceptions by using a UpdateSourceExceptionFilterCallback. For more information, see UpdateSourceExceptionFilter.

An alternative syntax to setting the NotifyDataErrorValidationRule explicitly is to set the ValidatesOnExceptions property to true on your Binding, MultiBinding, or BindingGroup object. By default, the value of ValidatesOnExceptions is true, so you do not need to explicitly use a NotifyDataErrorValidationRule.

You can create a custom rule by creating a class that derives from ValidationRule. For more information and a detailed discussion of data validation, see Data Binding Overview.

.NET Framework

Supported in: 4.6, 4.5

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
© 2015 Microsoft