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To manipulate an element for example, the button in the Window1.xaml file you need to find the corresponding control object in the dynamically loaded content. The LogicalTreeHelper serves this purpose because it has the ability to search an entire tree of control objects, digging down as many layers as necessary until it finds the object with the name you ve specified. An event handler is then attached to the Button.Click event. Another alternative is to use the FrameworkElement.FindName() method. In this example, the root element is a DockPanel object. Like all the controls in a WPF window, DockPanel derives from FrameworkElement. That means you can replace this code: button1 = (Button)LogicalTreeHelper.FindLogicalNode(rootElement, "button1"); with this equivalent approach: FrameworkElement frameworkElement = (FrameworkElement)rootElement; button1 = (Button)frameworkElement.FindName("button1"); In this example, the Window1.xaml file is distributed alongside the application executable, in the same folder. However, even though it isn t compiled as part of the application, you can still add it to your

LINQ revolves around the IEnumerable<T> interface. No matter what data source you use, every LINQ expression returns some object that implements IEnumerable<T>. Because IEnumerable<T> extends IEnumerable, you can bind it in a WPF window just as you bind an ordinary collection: lstProducts.ItemsSource = matches; Unlike ObservableCollection and the DataTable classes, the IEnumerable<T> interface does not provide a way to add or remove items. If you need this capability, you need to first convert your IEnumerable<T> object into an array or List collection using the ToArray() or ToList() method. Here s an example that uses ToList() to convert the result of a LINQ query (shown previously) into a strongly typed List collection of Product objects: List<Product> productMatches = matches.ToList();

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Figure 4 5. Choosing to generate a skeleton application in the MVVM project wizard Once the final step is complete, the wizard generates your new application. In Solution Explorer, you should have at least three projects that look something like what s shown in Figure 4 6.

The use of the government ID is justifiable to present proof of age, ensuring the transaction complies with the law..

Note ToList() is an extension method, which means it s defined in a different class from the one in which

is used. Technically, ToList() is defined in the System.Linq.Enumerable helper class, and it s available to all IEnumerable<T> objects. However, it won t be available if the Enumerable class isn t in scope, which means the code shown here will not work if you haven t imported the System.Linq namespace.

The ToList() method causes the LINQ expression to be evaluated immediately. The end result is an ordinary collection, which you can deal with in all the usual ways. For example, you can wrap it in an ObservableCollection to get notification events, so any changes you make are reflected in bound controls immediately: ObservableCollection<Product> productMatchesTracked = new ObservableCollection<Product>(productMatches); You can then bind the productMatchesTracked collection to a control in your window.

Writing data access code and filling in dozens of binding expressions can take a bit of time And if you create several WPF applications that work with databases, you re likely to find that you re writing similar code and markup in all of them That s why Visual Studio includes the ability to generate data access code and insert data-bound controls automatically To use these features, you need to first create a Visual Studio data source (A data source is a definition that allows Visual Studio to recognize your back-end data provider and provide code generation services that use it) You can create a data source that wraps a database, a web service, an existing data access class, or a SharePoint server.

A universal identity system must support both omnidirectional identifiers for use by public entities and unidirectional identifiers for use by private entities, thus facilitating discovery while preventing unnecessary release of correlation handles. If you do online banking or shop online today, you ll notice that the transactions are done using Secure Sockets Layer (SSL). The data between the site and your computer is encrypted. This is done through the use of a certificate. The certificate is attached to a website, and it broadcasts its identity to everyone. You can see who the certificate was issued to, who it was issued by, and the dates the certificate is valid. Here the identity of the website is omnidirectional. The identity is broadcast in public to anyone who uses the site.

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