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If the source of a two-way binding implements the interface and the Validates On Notify Data Errors property of the binding is set to true (which it is by default), the WPF 4.5 binding engine automatically monitors the Errors Changed event and calls the Get Errors method to retrieve the updated errors once the event is raised from the source object provided that the Has Errors property returns true.
NET Framework 4.5 and the Windows Runtime (Win RT) – and update the dictionary based on the result of the validation: For the view to be able show more than a single error message you have to make some changes to the Validation. You typically use an Items Control present a collection of items in XAML: As mentioned, you can also return error objects of a any type from the Get Errors method and this can be very useful when you want to present custom error reporting in the view.could not be converted” when the conversion of the string value to an int fails, you may want to customize it.You can do this by implementing a custom validation rule and associate this with the object at any given step, any errors that were added to the Validation.Similarly, it makes it possible to invalidate a property when setting another property and it also supports setting multiple errors per property and custom error objects of some other type than that contains validation errors for the specified property or for the entire entity.You should always raise the Errors Changed event whenever the collection returned by the Get Errors method changes.
The latter can for example be very useful for bindings in Styles and Control Templates and when you want to bind to some property in a parent element.