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Possibilities include the MaskedTextBox and PropertyGrid. If you ve created your own custom Windows Forms controls, they probably also belong to this list in other words, they re easier to port to WPF than re-create from scratch. There s a broader set of controls that aren t available in WPF but have reasonable (or sometimes improved) equivalents. These include the CheckedListBox and ImageList. Finally, there are some features that are out of reach in WPF, which means they aren t provided in WPF and there isn t a viable interoperability strategy. Examples include extender providers (such as the ErrorProvider, HelpProvider, or a custom provider of your own creation) and MDI windows. If you need these features, you ll be forced to build them yourself or turn to third-party components, and migrating from Windows Forms to WPF will require more work.

namespace ServiceContracts { [ServiceContract] public interface IOPMLService { [OperationContract] Rss.OPML GetOPML(); } }

10/02/2010

The cleanest way to integrate WPF and Windows Forms content is to place each in a separate window. That way your application consists of well-encapsulated window classes, each of which deals with just a single technology. Any interoperability details are handled in the glue code the logic that creates and shows your windows.

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The easiest approach to mixing windows and forms is to add one or more forms (from the Windows Forms toolkit) to an otherwise ordinary WPF application. Visual Studio makes this easy just right-click the project name in the Solution Explorer, and choose Add New Item. Then, select the Windows Forms category on the left side, and choose the Windows Form template. Lastly, give your form a file name, and click Add. The first time you add a form, Visual Studio adds references to all the required Windows Forms assemblies, including System.Windows.Forms.dll and System.Drawing.dll. You can design a form in a WPF project in the same way that you design it in a Windows Forms project. When you open a form, Visual Studio loads the normal Windows Forms designer and fills the Toolbox with Windows Forms controls. When you open the XAML file for a WPF window, you get the familiar WPF design surface instead.

Tip For better separation between WPF and Windows Forms content, you might choose to place the foreign content in a separate class library assembly. For example, a Windows Forms application might use the WPF windows defined in a separate assembly. This approach makes especially good sense if you plan to reuse some of these windows in both Windows Forms and WPF applications.

Next, you will create a service contract for a service that will serve up RSS to the requester: 1. Right-click the ServiceContracts project, and select Add New Item. 2. Specify Class, and name the class IRSSService. 3. Modify the contents of the file such that it resembles the following code: using using using using using System; System.Collections.Generic; System.Text; Rss; System.ServiceModel;

The reverse trick is a bit more awkward. Visual Studio doesn t directly allow you to create a new WPF window in a Windows Forms application. (In other words, you won t see it as one of the available templates when you right-click your project and choose Add New Item.) However, you can add the existing .cs and .xaml files that define a WPF window from another WPF project. To do so, right-click your project in the Solution Explorer, choose Add Existing Item, and find both these files. You ll also need to add references to the core WPF assemblies (PresentationCore.dll, PresentationFramework.dll, and WindowsBase.dll).

Tip There s a shortcut to adding the WPF references you need. You can add a WPF user control (which Visual Studio does support), which causes Visual Studio to add these references automatically. You can then delete the user control from your project. To add a WPF user control, right-click the project, choose Add New Item, pick the WPF category, and select the User Control (WPF) template.

This table poses a number of problems that render it so difficult and potentially problematic to use that it is almost useless. The most egregious problem is that there is so much repeated data. If the name of this book or its price were to change, the database would require changes in two different places. Similarly, if I changed my name or address, the database would have to be changed wherever this data occurred. The repetition is unnecessary and causes a maintenance headache, at best. Also, how is the correct A. Reader found without using both their name and address As it stands, there is no single distinguishing column that allows differentiation between the two customers, so their whole data record must be used to ensure uniqueness. Normalization is the process of refactoring a database so that it conforms to a structure more suitable for querying. It frees the database of anomalies that negatively affect the integrity of the data.

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