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ADVANCED TOPIC Circumventing Encapsulation and Access Modifiers Given appropriate permissions, it is possible to circumvent encapsulation and access modifiers via a mechanism known as reflection Reflection provides late binding by enabling support for browsing through a type s members, looking up the names of particular constructs within an object s metadata, and invoking the type s members Code Access Security The runtime can make security checks as the program executes, allowing and disallowing the specific types of operations depending on permissions Permission to execute a specific function is not restricted to authentication of the user running the program The runtime also controls execution based on who created the program and whether she is a trusted provider Similarly, you might want to note that Code Access Security (CAS) also applies security policy based on the location of the code by default, code installed on the local machine is more trusted than code from the LAN, which is much more trusted than code on the Internet Permissions can be tuned such that partially trusted providers can read and write files from controlled locations on the disk, but they are prevented from accessing other locations (such as email addresses from an email program) for which the provider has not been granted permission Identification of a provider is handled by certificates that are embedded into the program when the provider compiles the code Platform Portability One theoretical feature of the runtime is the opportunity it provides for C# code and the resultant programs to be platform-portable, capable of running on multiple operating systems and executing on different CLI implementations Portability in this context is not limited to the source code such that recompiling is necessary A single CLI module compiled for one platform should run on any CLI-compatible platform without needing to be recompiled This portability occurs because the work of porting the code lies in the hands of the runtime implementation rather than the application developer The restriction is, of course, that no platform-specific APIs are used Because of this restriction, many developers forgo CLI platform-neutral.

declaration so that it now looks something like this:

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code in favor of accessing the underlying platform functionality, rather than writing it all from scratch The platform portability offered by NET, DotGNU, Rotor, and Mono varies depending on the goals of the platform developers For obvious reasons, NET was targeted to run only on the Microsoft series of operating systems Rotor, also produced by Microsoft, was primarily designed as a means for teaching and fostering research into future CLI development Its inclusion of support for FreeBSD proves the portability characteristics of the CLI Some of the libraries included in NET (such as WinForms, ASPNET, ADONET, and more) are not available in Rotor DotGNU and Mono were initially targeted at Linux but have since been ported to many different operating systems Furthermore, the goal of these CLIs was to provide a means for porting NET applications to operating systems in addition to those controlled by Microsoft In so doing, there is a large overlap between the APIs found in NET and those available in Mono and DotGNU Unfortunately, the variance in the Based Class Library alone (even just within the Microsoft-developed CLI platforms) makes portability difficult at best Perhaps the best option is for Silverlight development to be compatible with the full NET Framework (but the reverse is unlikely to work unless development is restricted to the set of compatible APIs)

Performance Many programmers accustomed to writing unmanaged code will correctly point out that managed environments impose overhead on applications, no matter how simple The trade-off is one of increased development productivity and reduced bugs in managed code versus runtime performance The same dichotomy emerged as programming went from assembler to higher-level languages such as C, and from structured programming to object-oriented development In the vast majority of scenarios, development productivity wins out, especially as the speed and reduced price of hardware surpass the demands of applications Time spent on architectural design is much more likely to yield big performance gains than the complexities of a low-level development platform In the climate of security holes caused by buffer overruns, managed execution is even more compelling

If your plug-in requires not just any version of another plug-in, select that plug-in in the Dependencies tab of the plug-in manifest editor and and click the Properties button This opens the required plug-in properties dialog (see Figure 3 5) where you can specify an exact version or a range of versions using the Minimum Version and Maximum Version fields Changing one or both of these fields and clicking OK results in a modification to the RequireBundle declaration looking something like the following:

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