c# net qr code generator Loading from a Silverlight .xap File in Visual C#.NET

Print QR-Code in Visual C#.NET Loading from a Silverlight .xap File

Loading from a Silverlight .xap File
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Silverlight adds a complication: applications are downloaded from the Web, so it doesn t really make sense to talk about an application folder. However, in practice, the rules are pretty similar as for the full .NET Framework. When you build a Silverlight application, Visual Studio creates a ZIP file (with a .xap extension) that contains your program s main assembly. If you add a reference to any assemblies that are not part of the core set of assemblies offered by Silverlight, Visual Studio will add those assemblies to the ZIP too. This is conceptually equivalent to putting those DLLs in the application folder with a full .NET application. Silverlight doesn t have a GAC. It does have a core set of assemblies stored centrally, which are available to all applications, but you can t add additional assemblies to this, unlike with the GAC. The shared assemblies are the ones that are built into the Silverlight plug-in itself, and they are the main libraries in its version of the .NET Framework class library.
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A lot of the libraries in the Silverlight SDK are not part of the core set built into the plug-in. This is because Microsoft wanted to ensure that Silverlight was a small download if it was too hefty, that might put people off installing it. The downside is that some library features require you to include a copy of the library in your .xap file.
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Explicit Loading
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You can ask the .NET Framework to load an assembly explicitly. This makes it possible to decide to load additional components at runtime, making it possible to create applications whose behavior can be extended at runtime. The Assembly class in the System.Reflection namespace offers a static LoadFile method, and you can pass the path to the assembly s location on disk. If you don t know where the assembly is but you know its fully qualified name (i.e., a four-part name, like the one printed out by Example 15-10) you can call Assembly.Load. And if you have only part of the name just the simple name, for example you can call Assembly.LoadWith PartialName. Things are slightly different in Silverlight. You have to download the assembly yourself, which you can do with the WebClient class, described in 13. You ll need to get the assembly itself (and not a .xap containing the assembly), and then you can simply construct an AssemblyPart, passing the Stream containing the downloaded DLL to its Load method, and it will load the assembly. (If the assembly you want to use is in a .xap, it s still possible to load dynamically, it s just rather more complicated you need to use the Application.GetResourceStream method to extract the assembly from the .xap before passing it to an AssemblyPart.) All of these various techniques for loading assemblies will leave you with an Assembly object, which you can use to discover what types the assembly offers, and instantiate them at runtime. 17 shows how to use the Assembly class. If you re considering using any of these techniques, you should look at the Managed Extensibility Framework (MEF), a part of the .NET Framework class library designed specifically to support dynamic extensibility. It can handle a lot of the detailed issues of loading assemblies and locating types for you. This lets you focus on the types you want to use, rather than the mechanisms necessary to load them. You can find information about MEF at http://msdn.microsoft.com/library/dd460648 and you can even get hold of the source code for it from http://code.msdn.microsoft.com/mef. The advantage of loading assemblies explicitly is that you don t need to put a reference into your project at compile time. You can decide at runtime which assemblies to load. This can be useful for plug-in systems, where you want to load assemblies dynamically to extend your application s functionality. You might allow third-party assemblies, so other people or companies can extend your application. However, if you decide to support plug-ins, there s one thing you need to be aware of: unloading can be problematic.
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