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Using a custom value converter is only one of the ways to apply conditional formatting based on your data object. You can also use data triggers in a style, style selector, and template selector, all of which are described in this chapter. Each one of these approaches has its own advantages and disadvantages. The value converter approach works best when you need to set a single property in an element based on the bound data object. It s easy, and it s automatically synchronized. If you make changes to the bound data object, the linked property is changed immediately. Data triggers are similarly straightforward, but they support only extremely simple logic that tests for equality. For example, a data trigger can apply formatting that applies to products in a specific category, but it can t apply formatting that kicks in when the price is greater than a specific minimum value. The key advantage of data triggers is that you can use them to apply certain types of formatting and selection effects without writing any code. Style selectors and template selectors are the most powerful options. They allow you to change multiple properties in the target element at once and change the way items are presented in the list. However, they introduce additional complexity. Also, you need to add code that reapplies your styles and templates if the bound data changes.

OnPropertyChanged Use public string Result { get { return _result; } set { if(_result != value) { _result = value; OnPropertyChanged("Result"); } } } } Clients that subscribe to the PropertyChanged event specify a local method that responds to a change in the property value What the client does in response depends entirely on the client in question Many NET Framework classes automatically detect the presence of the INotifyPropertyChanged interface in order to react to property changes Windows Forms controls do this and the XAML-based user interfaces, WPF and Silverlight, also automatically detect changes in the value of properties In this case, their reaction is to refresh the data they are bound to, without having to either poll for changes or be directly informed that something has changed.

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So far, you ve used binding expressions to convert one piece of source data into a single, formatted result. And although you can t change the second part of this equation (the result), you can create a binding that evaluates or combines the information in more than one source property, with a little craftiness.

With the installation of the .NET Framework 3.0 comes the addition of CardSpace-related assemblies. System.IdentityModel.Selectors System.IdentityModel.Selectors provides a series of exceptions that can be captured when triggering the identity provider via code. System.IdentityModel System.IdentityModel provides a set of classes that deal with claims, policies, and tokens. System.IdentityModel.Selectors as found in System.IdentityModel also includes classes for token providers and token authentication.

The first trick is to replace your Binding object with a MultiBinding Then, you define the arrangement of bound properties using the MultiBindingStringFormat property Here s an example that turns Joe and Smith into Smith, Joe and displays the result in a TextBlock: <TextBlock> <TextBlockText> <MultiBinding StringFormat="{1}, {0}"> <Binding Path="FirstName"></Binding> <Binding Path="LastName"></Binding> </MultiBinding> </TextBlockText> </TextBlock> You ll notice in this example that the two fields are used as is in the StringFormat property Alternatively, you can use format strings to change it For example, if you were combining a text value and a currency value with a MultiBinding, you might set StringFormat to "{0} costs {1:C}" If you want to do anything more ambitious with the two source fields than simply stitching them together, you need the help of a value converter.

You can use this technique to perform calculations (such as multiplying UnitPrice by UnitsInStock) or apply formatting that takes several details into consideration (such as highlighting all high-priced products in a specific category) However, your value converter must implement IMultiValueConverter rather than IValueConverter Here s an example where a MultiBinding uses the UnitCost and UnitsInStock properties from the source object and combines them using a value converter: <TextBlock>Total Stock Value: </TextBlock> <TextBox> <TextBoxText> <MultiBinding Converter="{StaticResource ValueInStockConverter}"> <Binding Path="UnitCost"></Binding> <Binding Path="UnitsInStock"></Binding> </MultiBinding> </TextBoxText> </TextBox> The IMultiValueConverter interface defines similar Convert() and ConvertBack() methods as the IValueConverter interface The main difference is that you re provided with an array of values rather than a single value These values are placed in the same order that they re defined in your markup Thus, in the previous example, you can expect UnitCost to appear first, followed by UnitsInStock.

Here s the code for the ValueInStockConverter: public class ValueInStockConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, SystemGlobalizationCultureInfo culture) { // Return the total value of all the items in stock decimal unitCost = (decimal)values[0]; int unitsInStock = (int)values[1]; return unitCost * unitsInStock; }.

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