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in which 1.0.5000.0 is the version of the assembly and b77a5c561934e089 is Microsoft s public key token.
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13:
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Components and Assemblies
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Figure 13-8 The global assembly cache viewer and the Properties dialog box for the System.Windows.Forms shared assembly
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This directory structure allows you to store different versions of the same assembly without any filename conflicts. You can bypass the Windows shell extension and freely explore the real structure of the GAC by opening an MS-DOS command prompt win dow and navigating to the C:\Windows\Assembly\GAC directory. You can add and delete shared assemblies to and from the GAC only if you have administrative rights on the system, which makes .NET applications that work with shared assemblies inherently more robust than those that work with private assemblies. You can add or remove assemblies to or from the GAC using a utility named GACUTIL, and you can delete an existing shared assembly by selecting Delete on the shortcut menu inside Windows Explorer. There are several key differences between a private and a shared assembly:
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A shared assembly supports version information, and the GAC can keep different versions of the same assembly without conflict so that each application can con tinue to work with the version it was compiled against (unless the administrator opts for a different binding policy, a topic that I take up later in this chapter). Pri vate assemblies can be versioned, but version information is for your reference only, and the runtime doesn t use it. A private assembly is supposed to be deployed with the application itself, so the runtime doesn t enforce any special versioning policy.
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Part III:
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A shared assembly in the GAC makes your applications more robust in two ways. First, when the assembly is added to the cache, an integrity check is performed on all the files in the assembly to ensure that they haven t been altered. Second, only the system administrator can delete an assembly from the GAC. A shared assembly in the GAC is more efficient than a private assembly because the runtime can locate it faster and it doesn t need to be verified. Moreover, if mul tiple applications reference the same shared assembly, the runtime loads only one instance in memory in most circumstances (which saves resources and improves load time even more). Two (or more) versions of a shared assembly can run in the same process. For example, an application might use version 1.0 of the AAA assembly and a BBB assembly that uses version 1.1 of the AAA assembly. This important feature is called side-by-side execution, and it ensures that you won t have a compatibility problem when you mix components together. A shared assembly can be signed with an Authenticode digital signature. The signing mechanism uses a public key encryption schema, which guarantees that a particular assembly was created by a given manufacturer and that no one tampered with it.
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Shared assemblies are usually stored in the GAC, but this isn t a requirement. For exam ple, you might deploy a shared assembly in a known directory on the hard disk, where two or more applications can find it. However, the advantages in the preceding list apply only to shared assemblies in the GAC. (Shared assemblies deployed in other directories do support side-by-side execution and public key signing, though.) As a rule, you write code for private and shared assemblies in the same way because you build a shared assembly by adding an attribute to your code. However, the main goal in building shared assemblies is to share them among different applications, so you must take this constraint into account. For example, a shared assembly shouldn t create temporary files with fixed names and paths because calls from different clients might overwrite such files. Moreover, the .NET Framework supports side-by-side exe cution of shared assemblies in the same process (not just the same machine), so a shared assembly shouldn t depend on processwide resources.
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