This topic explains how to ensure that common controls are displayed in
the user's preferred visual style when running under Microsoft Windows
XP or later versions of the operating system.
WPF, in conjunction with the .NET Framework add-in model, allows you to address a wide variety of scenarios that require host applications to display UIs from add-ins.
Addins (plugins) for WPF can even do UI. I'm not convinced this is necessary to do UIs with plugins, but it's necessary if you want to allow untrusted code to do it.
This module provides basic functions for handling mime-types. It can handle matching mime-types against a list of media-ranges. See section 14.1 of the HTTP specification RFC 2616 for a complete explanation.
Don't worry: the code will always tell you what to do. Just listen.
The key points here are that a class is only a singleton if all applications treat it exactly the same and if its clients can use the class without an application context.
"singletons are unnecessarily difficult to test and may make strong assumptions about the applications that will use them [...] I know where you live anti-pattern [...] Liskov Substitution Principle".
"To decide whether a class is truly a singleton:
* Will every application use this class exactly the same way? (exactly is the key word)
* Will every application ever need only one instance of this class? (ever and one are the key words)
* Should the clients of this class be unaware of the application they are part of?"
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