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Note Technically, your WPF window can access the controls in a user control by accessing the Controls collection of the user control. However, to use this back door, you need to write error-prone lookup code that searches for specific controls using a string name. That s always a bad idea.

Figure 2-2. CardSpace inside the Control Panel on Vista (in the new view)

As long as you re creating a user control, it s a good idea to make it behave as much like WPF content as possible so it s easier to integrate into your WPF window layout. For example, you may want to consider using the FlowLayoutPanel and TableLayoutPanel container controls so that the content inside your user controls flows to fit its dimensions. Simply add the appropriate control and set its Dock property to DockStyle.Fill. Then place the controls you want to use inside. For more information about using the Windows Forms layout controls (which are subtly different than the WPF layout panels), refer to my book Pro .NET 2.0 Windows Forms and Custom Controls in C# (Apress, 2005).

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WPF has no direct support for ActiveX interoperability. However, Windows Forms has extensive support in the form of runtime callable wrappers (RCWs), dynamically generated interop classes that allow a managed Windows Forms application to host an Active component. Although there are .NET-to-COM quirks that can derail some controls, this approach works reasonably well for most scenarios, and it works seamlessly if the person who creates the component also provides a primary interop assembly, which is a handcrafted, finetuned RCW that s guaranteed to dodge interop issues. So, how does this help you if you need to design a WPF application that uses an ActiveX control In this case, you need to layer two levels of interoperability. First you place the ActiveX control in a Windows Forms user control or form. You then place that user control in your WPF window or show the form from your WPF application.

The reverse approach hosting WPF content in a form built with Windows Forms is just as easy. In this situation, you don t need the WindowsFormsHost class. Instead, you use the System.Windows.Forms.Integration.ElementHost class, which is part of the WindowsFormsIntegration.dll assembly. The ElementHost has the ability to wrap any WPF element. However, the ElementHost is a genuine Windows Forms control, which means you can place it in a form alongside other Windows Forms content. In some respects, the ElementHost is more straightforward than the WindowsFormsHost, because every control in Windows Forms is displayed as a separate hwnd. Thus, it s not terribly difficult for one of these windows to be rendered with WPF instead of User32/GDI+. Visual Studio provides some design-time support for the ElementHost control, but only if you place your WPF content in a WPF user control. Here s what to do: 1. Right-click the project name in the Solution Explorer, and choose Add New Item. Pick the User Control (WPF) template, supply a name for your custom component class, and click Add.

First up is the OPML service. Three things need to happen you implement the interface defined in the service contract, you investigate the incoming claims from the card used to access the site, and an OPML file is read in from a file and returned to the user. In this test service, the OPML is being read from an XML file. In a more complex system, this feed could utilize the incoming claims from the information card and dynamically generate a list of services for the consumer. 1. Rename Class1.cs to OPMLService. 2. Open the file, and enter the following code: using System; using System.Collections.Generic; using System.Text; using ServiceContracts; using System.ServiceModel; using Rss; using System.IdentityModel.Claims; using System.IdentityModel.Policy; namespace Services {

Note This example assumes you re placing the WPF user control directly in your Windows Forms project. If you have a complex user control, you must choose to use a more structured approach and place it in a separate class library assembly.

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