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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 System.ComponentModel 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 3.5. The IDataErrorInfo interface requires two members: a string property named Error and a string indexer. 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 Implements INotifyPropertyChanged, IDataErrorInfo ...

The ability to publish only certain items is important. A project manager would probably not want to publish the roll-up tasks because those are not tasks that can be worked, per se.

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A Windows service is really just a specialized application. Due to this fact, you can write a slightly modified main() function to test your Windows service s startup process. I think it s easier just to show you the code first and walk you through it than try to explain things beforehand. Listing 14-7 shows the new main() method. Listing 14-7. Debug-enhanced main() Method #include "stdafx.h" #include "SimpleWinService.h" using namespace Simple; using namespace System::Collections; using namespace System::ServiceProcess; void main() { #ifndef COMMANDLINE_DEBUG array<ServiceBase^>^ ServicesToRun; ServicesToRun = gcnew array<ServiceBase^> { gcnew SimpleWinService() }; ServiceBase::Run(ServicesToRun); #else SimpleWinService ^svc = gcnew SimpleWinService(); svc->OnStart(nullptr); Console::WriteLine("Any key stop stop"); Console::ReadLine(); svc->OnStop(); #endif } The code uses the #ifndef directive (covered in 4) to split the main() method into two parts. If you recall, the #ifndef directive causes the compiler only to compile code in the enclosed region (between #else, #elseif, or #endif) when the symbol specified does not exist. Thus, the first block compiles the code just like normal, if the symbol COMMANDLINE_DEBUG does not exist, whereas the second block compiles the special code allowing you to debug the OnStart() handler, if the symbol does exist. You can place the symbol COMMANDLINE_DEBUG either as a #define directive in stdafx.h or in SimpleWinService.h anywhere before the line #include "SimpleWinService.h"

Private _modelNumber As String Public Property ModelNumber() As String Get Return _modelNumber End Get Set(ByVal value As String) _modelNumber = value OnPropertyChanged(New PropertyChangedEventArgs("ModelNumber")) End Set End Property ' Error handling takes place here. Default Public ReadOnly Property Item(ByVal propertyName As String) As String _ Implements System.ComponentModel.IDataErrorInfo.Item Get If propertyName = "ModelNumber" Then Dim valid As Boolean = True For Each c As Char In ModelNumber If Not Char.IsLetterOrDigit(c) Then valid = False Exit For End If Next If Not valid Then Return "The ModelNumber can only contain letters and numbers." End If End If Return Nothing End Get End Property ' WPF doesn't use this property. Public ReadOnly Property [Error]() As String _ Implements System.ComponentModel.IDataErrorInfo.Error Get Return Nothing End Get End Property End Class To tell WPF to use the IDataErrorInfo interface, and use it to check for errors when a property is modified, you must add the DataErrorValidationRule to the collection of Binding.ValidationRules, as shown here: <TextBox Margin="5" Grid.Column="1">

s To assign work items to multiple resources, you must create the work item several times and assign Tip

<TextBox.Text> <Binding Path="ModelNumber"> <Binding.ValidationRules> <DataErrorValidationRule></DataErrorValidationRule> </Binding.ValidationRules> </Binding> </TextBox.Text> </TextBox> Incidentally, you can combine both approaches by creating a data object that throws exceptions for some types of errors and uses IDataErrorInfo to report others. You just need to make sure you use both the ExceptionValidationRule and the DataErrorValidationRule.

or in the application s Processor Definitions property as shown in Figure 14-14. You need to place it before the preceding #include statement because SimpleWinService.h also uses the symbol, as I ll point out next.

s .NET 3.5 provides a shortcut. Rather than adding the ExceptionValidationRule to the binding, you can Tip

In addition to adding, retrieving, and updating items, you can also attach files and links to specific work items. To attach files and links, an item must already be published. Select a published item in the list and then select Links & Attachments. This will bring up the View/Edit Work Item Links and Attachments dialog box (Figure 4-5).

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