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Deconstructing Add-In Architecture in Visual Studio .NET : Page 4

The Visual Studio .NET extensibility model included with the IDE allows any developer to design and compile value-adding custom add-ins right out-of-the-box. No additional APIs or tools are required. Visual Studio .NET even provides a starting point for add-in developers with the Visual Studio .NET Add-In Project type.




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Understanding the Preload Process
The behavior involved in preloading add-ins will not seem intuitive at first. If you follow the SDK documentation regarding the use and behavior of CommandPreload, you will likely be left scratching your head. Two key registry entries work together to provide both Administrator and User add-ins to accomplish a single preload event for any add-in requiring UI or general add-in initialization upon first load. The entire decision logic tree followed by Visual Studio .NET is shown in Figure 7. The preload logic requires the use of the user-specific registry key PreloadAddinState. The path for this key is HKEY_CURRENT_USER\SOFTWARE\Microsoft\VisualStudio\7.1\AddIns\. Within this key you should place DWORD values with names matching the ProgID of your add-in. The value will be used as a flag to track whether an add-in requiring preloading has been initialized.

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