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Converting from the display format back to the number you want is a little trickier. The Parse() and TryParse() methods of the Decimal type are logical choices to do the work, but ordinarily they can t handle strings that include currency symbols. The solution is to use an overloaded version of the Parse() or TryParse() method that accepts a System.Globalization.NumberStyles value. If you supply NumberStyles.Any, you ll be able to successfully strip out the currency symbol, if it exists. Here s the complete code for the value converter that deals with price values like the Product.UnitCost property: <ValueConversion(GetType(Decimal), GetType(String))> _ Public Class PriceConverter Implements IValueConverter Public Function Convert(ByVal value As Object, ByVal targetType As Type, _ ByVal parameter As Object, ByVal culture As CultureInfo) As Object _ Implements IValueConverter.Convert Dim price As Decimal = CDec(value) Return price.ToString("c", culture) End Function Public Function ConvertBack(ByVal value As Object, _ ByVal targetType As Type, ByVal parameter As Object, _ ByVal culture As CultureInfo) As Object _ Implements IValueConverter.ConvertBack Dim price As String = value.ToString(culture) Dim result As Decimal If Decimal.TryParse(price, NumberStyles.Any, culture, result) Then Return result End If Return value End Function End Class To put this converter into action, you need to begin by mapping your project namespace to an XML namespace prefix you can use in your markup. Here s an example that uses the namespace prefix local and assumes your value converter is in the namespace DataBinding: xmlns:local="clr-namespace:DataBinding" Typically, you ll add this attribute to the <Window> tag that holds all your markup. Now, you simply need to create an instance of the PriceConverter class and assign it to the Converter property of your binding. To do this, you need the more long-winded syntax shown here: <TextBlock Margin="7" Grid.Row="2">Unit Cost:</TextBlock> <TextBox Margin="5" Grid.Row="2" Grid.Column="1"> <TextBox.Text>

Figure 14-8. The Administrative Tools Services application As you can see in Figure 14-8, SimpleWinService is now available on your system, but the status is blank or currently not run. In addition, the startup type is manual and the Windows service uses the LocalSystem security context. Your implementation could be different if you selected different property values for ServiceProcessInstaller and ServicesInstaller. Double-clicking the SimpleWinService line causes the Services application to present the Windows services properties dialog box as shown in Figure 14-9. The tabs across the top of the control point out the different properties that can be customize for the Windows service: Change state and startup method of Windows service. Specify user login security context for the Windows service. Specify action to perform on Windows service failure. View Windows service dependencies.

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The project manager creates a new team project using Visual Studio Team System (selecting the appropriate methodology template). He adds all of the resources that he knows about to the new team project. John opens Microsoft Project and adds all of the project resources to the new project file. John creates the basic outline of the project (SDLC phases and high-level deliverables) and assigns some deliverables to the available resources. In real life this usually takes more than a day, but in this case John is very fast. John updates the changes he made in Microsoft Project with the Team Foundation Server.

<Binding Path="UnitCost"> <Binding.Converter> <local:PriceConverter></local:PriceConverter> </Binding.Converter> </Binding> </TextBox.Text> </TextBox> In many cases, the same converter is used for multiple bindings. In this case, it doesn t make sense to create an instance of the converter for each binding. Instead, create one converter object in the Resources collection, as shown here: <Window.Resources> <local:PriceConverter x:Key="PriceConverter"></local:PriceConverter> </Window.Resources> Then, you can point to it in your binding using a StaticResource reference, as described in 11: <TextBox Margin="5" Grid.Row="2" Grid.Column="1" Text={Binding Path=UnitCost, Converter={StaticResource PriceConverter}"> </TextBox>

Value converters are indispensable when you need to bridge the gap between the way data is stored in your classes and the way it s displayed in a window. For example, imagine you have picture data stored as a byte array in a field in a database. You could convert the binary data into a System.Windows.Media.Imaging.BitmapImage object and store that as part of your data object. However, this design might not be appropriate. For example, you might need the flexibility to create more than one object representation of your image, possibly because your data library is used in both WPF applications and Windows Forms applications (which use the System.Drawing.Bitmap class instead). In this case, it makes sense to store the raw binary data in your data object and convert it to a WPF BitmapImage object using a value converter. (To bind it to a form in a Windows Forms application, you d use the Format and Parse events of the System.Windows.Forms.Binding class.)

Figure 14-9. Services application properties dialog box I usually only deal with the General tab, where I change the Windows service startup method from Manual (user controlled) to Automatic (system controlled started during startup process). You can also specify stop, start, etc. on the General tab, but I usually use the middle panel on the Services application or use the right-click context menu (see Figure 14-10) associated with the Windows service.

John sends out an e-mail to the stakeholders detailing where the team project portal is and how to access the available reports. John sets the policy that changesets must be associated with work items, and then John spends the rest of the week fishing. Okay, it is not quite that cushy for a project manager, but you get the idea. Much of the tedious work simply does not need to be done. In the rest of this chapter, you will see how this is actually accomplished.

s To convert a block of binary data into an image, you must first create a BitmapImage object and read Tip

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