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The visual appearance of your bound control also changes when an error occurs. WPF automatically switches the template that a control uses when its Validation.HasError property is true to the template that s defined by the attached Validation.ErrorTemplate property. In a text box, the new template changes the outline of the box to a thin red border. In most cases, you ll want to augment the error indication in some way and give specific information about the error that caused the problem. You can use code that handles the Error event, or you can supply a custom control template that provides a different visual indication. But before you tackle either of these tasks, it s worth considering two other ways WPF allows you to catch errors by using IDataErrorInfo in your data objects and by writing custom validation rules.

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Many object-orientation purists prefer not to raise exceptions to indicate user input errors There are several possible reasons, including the following: a user input error isn t an exceptional condition, error conditions may depend on the interaction between multiple property values, and it s sometimes worthwhile to hold on to incorrect values for further processing rather than reject them outright In the Windows Forms world, developers could use the IDataErrorInfo interface (from the SystemComponentModel namespace) to avoid exceptions but still place the validation code in the data class The IDataErrorInfo interface was originally designed to support grid-based display controls such as the DataGridView, but it also works as an all-purpose solution for reporting errors Although IDataErrorInfo wasn t supported in the first release of WPF, it is supported in WPF 35 The IDataErrorInfo interface requires two members: a string property named Error and a string indexer.

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The Error property provides an overall error string that describes the entire object (which could be something as simple as Invalid Data ) The string indexer accepts a property name and returns the corresponding detailed error information For example, if you pass UnitCost to the string indexer, you might receive a response such as The UnitCost cannot be negative The key idea here is that properties are set normally, without any fuss, and the indexer allows the user interface to check for invalid data The error logic for the entire class is centralized in one place Here s a revised version of the Product class that implements IDataErrorInfo Although you could use IDataErrorInfo to provide validation messages for a range of validation problems, this validation logic checks just one property ModelNumber for errors: public class Product : INotifyPropertyChanged, IDataErrorInfo { ...

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The universal identity metasystem must define the human user to be a component of the distributed system integrated through unambiguous human-machine communication mechanisms offering protection against identity attacks. Although much can be done to secure the connections between identity providers, relying parties, and the desktop of the consumer, there is still the challenge of the two feet between the desktop and the user. A number of things can happen in those two feet that can defeat the most expensive and complex software and hardware security. The threat of most concern, phishing, attacks at the user interface level. Because there are a patchwork of identity solutions out there and there are changes from site to site, there are no hard expectations of how user interaction should occur. And as a result, some parties exploit this lack of consistency as opportunities to steal information. Think about password fatigue. Users are requested to use strong passwords. Users have difficulty remembering many of them, so many will write down a password on a Post-it note and affix it to the monitor. Others will use one or a small number of passwords and reuse them across all sites, effectively minimizing the additional security provided through strong passwords. When defining an identity solution, one must recognize that even with the most expensive and efficient technology in the world, if the aspect of how humans interact with that technology is not properly thought out, it leaves the door open for breaches of security as a result.

private string modelNumber; public string ModelNumber { get { return modelNumber; } set { modelNumber = value; OnPropertyChanged(new PropertyChangedEventArgs("ModelNumber")); } } // Error handling takes place here public string this[string propertyName] { get.

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