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The ExceptionValidationRule is a prebuilt validation rule that tells WPF to report all exceptions. To use the ExceptionValidationRule, you must add it to the Binding.ValidationRules collection, as shown here: <TextBox Margin="5" Grid.Row="2" Grid.Column="1"> <TextBox.Text> <Binding Path="UnitCost"> <Binding.Converter> <local:PriceConverter></local:PriceConverter> </Binding.Converter> <Binding.ValidationRules> <ExceptionValidationRule></ExceptionValidationRule> </Binding.ValidationRules> </Binding> </TextBox.Text> </TextBox> This example uses both a value converter and a validation rule. Usually, validation is performed before the value is converted, but the ExceptionValidationRule is a special case. It catches exceptions that occur at any point, including exceptions that occur if the edited value can t be cast to the correct data type, exceptions that are thrown by the property setter, and exceptions that are thrown by the value converter. So, what happens when validation fails Validation errors are recorded using the attached properties of the System.Windows.Controls.Validation class. For each failed validation rule, WPF takes three steps:

Figure 14-13. Attach to Process dialog box 3. Click Show processes from all users. You may not need this if you started the process using your own user security context. 4. Select your Windows service from the Available Processes list. 5. Click the Attach button.

s Caution In version 1 of VSTS you cannot assign multiple resources to a single task. You have to duplicate the task and set one resource per task. The VSTS development team is actively looking at this issue. If you try to assign multiple resources to a single task, an error message will be displayed when you publish the changes.

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It sets the attached Validation.HasError property to True on the bound element (in this case, the TextBox control). It creates a ValidationError object with the error details (as returned from the ValidationRule.Validate() method) and adds that to the attached Validation.Errors collection. If the Binding.NotifyOnValidationError property is set to True, WPF raises the Validation.Error attached event on the element. 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.

When you complete these steps, the dialog box will disappear, the debugger will be attached to your Windows service, and you will be in debug mode of Visual Studio 2005. At this point, you can set break point, watches, etc., just like you would for any other Windows or console application. The problem with this method is that you cannot test the OnStart() handler, as it has already run. And executing the OnStop() handler ends the debug session, so you can t restart the Windows service to test the OnStart() either. This is where the other testing process comes in.

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