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Part I CLR Basics
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Whenever the CLR attempts to locate an assembly file, it always looks in the application s directory first, and if it can t find the file there, it looks in the AuxFiles subdirectory . You can specify multiple semicolon-delimited paths for the probing element s privatePath attribute . Each path is considered relative to the application s base directory . You can t specify an absolute or a relative path identifying a directory that is outside of the application s base directory . The idea is that an application can control its directory and its subdirectories but has no control over other directories .
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Probing for Assembly Files
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When the CLR needs to locate an assembly, it scans several subdirectories . Here is the order in which directories are probed for a culture-neutral assembly (where firstPrivatePath and secondPrivatePath are specified via the config file s privatePath attribute):
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AppDir\AsmName.dll AppDir\AsmName\AsmName.dll AppDir\firstPrivatePath\AsmName.dll AppDir\firstPrivatePath\AsmName\AsmName.dll AppDir\secondPrivatePath\AsmName.dll AppDir\secondPrivatePath\AsmName\AsmName.dll ...
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In this example, no configuration file would be needed if the JeffTypes assembly files were deployed to a subdirectory called JeffTypes, since the CLR would automatically scan for a subdirectory whose name matches the name of the assembly being searched for . If the assembly can t be found in any of the preceding subdirectories, the CLR starts all over, using an .exe extension instead of a .dll extension . If the assembly still can t be found, a FileNotFoundException is thrown . For satellite assemblies, similar rules are followed except that the assembly is expected to be in a subdirectory, whose name matches the culture, of the application s base directory . For example, if AsmName .dll has a culture of en-US applied to it, the following directories are probed:
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C:\AppDir\en-US\AsmName.dll C:\AppDir\en-US\AsmName\AsmName.dll C:\AppDir\firstPrivatePath\en-US\AsmName.dll C:\AppDir\firstPrivatePath\en-US\AsmName\AsmName.dll C:\AppDir\secondPrivatePath\en-US\AsmName.dll C:\AppDir\secondPrivatePath\en-US\AsmName\AsmName.dll C:\AppDir\en-US\AsmName.exe C:\AppDir\en-US\AsmName\AsmName.exe C:\AppDir\firstPrivatePath\en-US\AsmName.exe C:\AppDir\firstPrivatePath\en-US\AsmName\AsmName.exe C:\AppDir\secondPrivatePath\en-US\AsmName.exe C:\AppDir\secondPrivatePath\en-US\AsmName\AsmName.exe
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C:\AppDir\en\AsmName.dll C:\AppDir\en\AsmName\AsmName.dll C:\AppDir\firstPrivatePath\en\AsmName.dll C:\AppDir\firstPrivatePath\en\AsmName\AsmName.dll C:\AppDir\secondPrivatePath\en\AsmName.dll C:\AppDir\secondPrivatePath\en\AsmName\AsmName.dll C:\AppDir\en\AsmName.exe C:\AppDir\en\AsmName\AsmName.exe C:\AppDir\firstPrivatePath\en\AsmName.exe C:\AppDir\firstPrivatePath\en\AsmName\AsmName.exe C:\AppDir\secondPrivatePath\en\AsmName.exe C:\AppDir\secondPrivatePath\en\AsmName\AsmName.exe
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As you can see, the CLR probes for files with either an .exe or .dll file extension . Since probing can be very time-consuming (especially when the CLR is looking for files over a network), in the XML configuration file, you can specify one or more culture elements to limit the probing that the CLR performs when looking for satellite assemblies . The name and location of this XML configuration file is different depending on the application type:
For executable applications (EXEs), the configuration file must be in the application s base directory, and it must be the name of the EXE file with .config appended to it . For Microsoft ASP .NET Web Form applications, the file must be in the Web application s virtual root directory and is always named Web .config . In addition, subdirectories can also contain their own Web .config file, and the configuration settings are inherited . For example, a Web application located at http://Wintellect.com/Training would use the settings in the Web .config files contained in the virtual root directory and in its Training subdirectory .
As mentioned at the beginning of this section, configuration settings apply to a particular application and to the machine . When you install the .NET Framework, it creates a Machine . config file . There is one Machine .config file per version of the CLR you have installed on the machine . The Machine .config file is located in the following directory: %SystemRoot%\Microsoft.NET\Framework\version\CONFIG Of course, %SystemRoot% identifies your Windows directory (usually C:\WINDOWS), and version is a version number identifying a specific version of the .NET Framework (something like v4 .0 .#####) .
Part I CLR Basics
Settings in the Machine .config file represent default settings that affect all applications running on the machine . An administrator can create a machine-wide policy by modifying the single Machine .config file . However, administrators and users should avoid modifying this file because it contains many settings related to various things, making it much more difficult to navigate . Plus, you want the application s settings to be backed up and restored, and keeping an application s settings in the application-specific configuration file enables this .
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