Self validating controls

16-Jan-2020 13:21

Errors collection when an exception is thrown in the setter of the source property.For example, it would be useful if the Age property of the view model was constrained to only accept values between 10 and 100 and threw an exception if the value was outside of this range: interface.if you are typing a letter into a Text Box bound to a source property of type int: The actual message that is describing the error is stored in the Error Content property of a objects in it, another attached property named Validation. To be able to see the error messages in the view you can replace the default control template that draws the red border around the element with your own custom template by setting the Validation.Error Template attached property of the control: Note that the Validation.

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If you want to bind a view model property of a specific type to a dependency property in the view of a different type you may need to implement a custom converter class by implementing the interface and setting the Converter property of the binding to an instance of this.Note that the Text Block will appear on top of any elements that are located right below the Text Box as adorners are always visually on top.