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Note As always, when moving from one user interface platform to another, you should only be forced to migrate the user interface. Other details, such as data access code, validation rules, file access, and so on, should be abstracted away in separate classes (and possibly even separate assemblies), which you can plug into a WPF front-end just as easily as a Windows Forms application. Of course, this level of componentization isn t always possible, and sometimes other details (such as data binding considerations and validation strategies) can lead you to shape your classes a certain way and inadvertently limit their reusability.

08/02/2010 08/02/2010 11/10/2010

You might turn to WPF to use a control you know and love from Windows Forms if there s no equivalent in WPF. As always, you need to evaluate your options carefully and check for possible alternatives before using the interoperability layer. Table 30-1 presents an overview of missing controls and where to the find equivalent functionality. Table 30-1. Missing Controls and Features in WPF

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Use the inline Hyperlink in a TextBlock. 24 shows how. There is no equivalent control (although you can build one yourself using the System.ComponentModel.MaskedTextProvider class). Use a TextBox with two RepeatButton controls to emulate these controls. If you don t use data binding, you can place multiple CheckBox elements in a ScrollViewer. If you need binding support, you can use the ListBox with a custom control template. See 20 for an example (and for a RadioButtonList replacement). There is no equivalent control. You can use these components in WPF. However, most of these common dialog boxes are easily re-created in WPF, without the old-fashioned look. ( 18 demonstrates a basic color-picking custom control.)

First, you will create the service contract for a service that will serve up OPML: 1. Rename Class1.cs to IOPMLService. 2. This service will expose a single-operation GetOPML that returns an OPML object. Populate the class with the following code: using using using using using System; System.Collections.Generic; System.Text; System.ServiceModel; Rss;

There are several do-it-yourself approaches. The easiest is to construct a FlowDocument programmatically, which you can then display in a document viewer and send to the printer. Although the PrintPreviewControl and PrintPreviewDialog are a more mature solution and require less work, using them in WPF is not recommended. That s because you d need to switch to the older Windows Forms printing model. Of course, if you have existing printing code that uses the Windows Forms libraries, interoperability avoids a lot of work. There is no support in WPF for Windows Forms extender providers. If you have forms that use these features, you may continue using them in a WPF application through interoperability. However, you can t use these providers to display error messages or context-sensitive help for WPF controls. Although WPF includes AutoComplete functionality in the ComboBox ( 20) through the IsTextSearchingEnabled property, it s a simple AutoComplete feature that fills in a single suggestion from the current list. It doesn t provide the full list of suggestions that Windows Forms does with its AutoComplete feature, and it doesn t provide access to the recent URLs recorded by the operating system. Using Windows Forms to get this support is generally overkill it s better to leave this feature out or dig in and build it yourself. WPF does not support MDI windows. However, the layout system is flexible to accommodate a wide range of different custom-built approaches, including do-ityourself tabbed windows. However, this involves significant work. If you need MDI, it s best to build a full Windows Forms application, rather than try to combine WPF and Windows Forms.

Note For more information about Windows Forms specifics, including AutoComplete, its support for MDI, and its print model and extender providers, refer to my book Pro .NET 2.0 Windows Forms and Custom Controls in C# (Apress, 2005).

As you can see from Table 30-1, a few Windows Forms controls are good candidates for integration because they can be easily inserted into WPF windows and would take considerable work to re-create.

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