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Many controls have baked-in command support. You can add this to your controls in two ways: x x Add command bindings that link your control to specific commands. That way, your control can respond to a command without the help of any external code. Create a new RoutedUICommand object for your command as a static field in your control. Then, add a command binding for that command. This allows your control to automatically support commands that aren t already defined in the basic set of command classes that you learned about in 9.

In the following example, you ll use the first approach to add support for the ApplicationCommands.Undo command.

Figure 2-17. What happens when using CardSpace Here s how it breaks down: 1. During checkout, the user clicks the Use My Information Card link. 2. The link triggers a request that returns Contoso Vineyard s policy. The policy includes the names of the claims that it requires, in this case the first name, the last name, the state of residence, and the date of birth. The policy also identifies which identity providers it trusts. The policy is received, and the CardSpace identity selector is displayed. This presents a list of the information cards on the user s computer that contains the claims requested in the policy.

Tip For more information about commands and how to create custom RoutedUICommand objects, refer to

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This method takes a list of SKUs that have been purchased (most likely by a Customer) and prints a receipt. There are two instances where the Law of Demeter has been broken: lines 8 and 11. Line 8 accesses the Name property of a Product, but the Product is part of the StockKeepingUnit. A dependency has been implicitly added between this method and the interface of the Product class. If the Product s Name changes (perhaps it is split into FullName and ShortName), this code will have to be changed. The second example, line 11, is an obvious and egregious breaking of encapsulation. Not only does it access the CurrentLocale s Taxes SalesTaxPercentage property which would be sufficient to warrant refactoring according to the Law of Demeter the calculation of sales tax should be hidden away. It is highly likely that sales tax will be calculated all over a model such as this; without implementing the calculation in one location, code duplication becomes a necessity. For all of this, the first example is still an example of breaking the Law of Demeter. It could be argued that circumventing the problem is not really worth the benefits. In contrast, line 11 should definitely be fixed to look more like what is shown in Listing 3 16. Listing 3 16. Sales Tax Calculation Refactored salesTax += this.CurrentLocale.CalculateSalesTax(sku.Price); The method now does not need to know of the CurrentLocale s Taxes property at all, it merely delegates the calculation to the CurrentLocale. If the method of calculating sales tax changes, it changes in one place only.

9.

To support an Undo feature in the color picker, you need to track the previous color in a member field: private Color previousColor; It makes sense to make this field nullable, because when the control is first created, there shouldn t be a previous color set. (You can also clear the previous color programmatically after an action that you want to make irreversible.) When the color is changed, you simply need to record the old value. You can take care of this task by adding this line to the end of the OnColorChanged() method: colorPicker.previousColor = (Color)e.OldValue;

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