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8 Configuration
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Machine .config lays out the default settings for your computer (and ultimately for your applications) . The default settings are generally targeted toward the most common use cases you will encounter rather than some special configuration you might need to apply to a specific application . For example, sessionState is configured to be handled in process by default . That s fine when you re developing but almost certainly is not appropriate for a commercialgrade application that services many diverse clients . Because all your .NET applications depend on machine .config to configure them, making changes to machine .config could potentially affect multiple applications . It s a bad idea to update machine .config directly . To configure themselves, stand-alone .NET applications depend on configuration files named after the application . For example, an application named MyApp .EXE would have a configuration file named MyApp .EXE .config . Of course, ASP .NET applications do not follow that naming convention . Instead, the ASP .NET runtime expects configuration information to be declared in a file named web .config . Microsoft Visual Studio 2010 introduces a new feature: separate configurations for debug and release versions of your application . Earlier versions of Visual Studio provided only a single web .config file, and the debug and release versions of the application shared the same settings . In Visual Studio 2010, when you generate a Web application, Visual Studio provides three configuration files: web .config, web .debug .config, and web .release .config . Settings shared by the debug and release versions go in web .config . Settings specific to the debug or release version (such as the Trace setting) go in the respective web .config files . To override the default settings, you simply need to include a file named web .config in the application s virtual directory . For example, the following code sets up the Web application to which it applies . The configuration file turns on Forms Authentication and tracing, for example .
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< xml version="1.0" encoding="utf-8" > <configuration> <system.web> <authentication mode="Forms" /> <trace enable=true/> </system.web> </configuration>
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The configuration settings your application actually sees have been inherited from a (potentially) long line of other web .config files . The machine .config file sets up the default .NET configuration settings . The top-level web .config file (in the .NET configuration directory) sets up the initial ASP .NET configuration . Then, you can use subsequent child web .config files in the request path to tweak folder-specific settings for a single application .
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Part II Advanced Features
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This way of managing configuration information works well . Many of the usual defaults apply in most situations, and you sometimes need to tweak only a few items . When you do, you just drop a web .config in your virtual directory and/or subdirectory . However, managing settings by littering your hard disk with web .config files can get a bit unwieldy if many separate configurations are necessary . The ASP .NET configuration schema includes a location element for specifying different settings for different directories but all the settings can all go in a master configuration file for your application . For example, the following configuration section removes the ability of the AppSubDir directory to process standard ASP .NET Web Services . The remove instruction causes ASP .NET to have amnesia about all files with the extension .asmx .
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<configuration> <location path="AppSubDir"> <system.web> <httpHandlers> <remove verb="*" path="*.asmx" /> </httpHandlers> </system.web> </location> </configuration>
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You could also apply other specific settings to the subdirectory, such as for security purposes . ( 9, Logging In, explores security in depth .) You might not find it surprising that ASP .NET configuration files include terms to manage authorization and authentication . This is a perfect use for the location element . The following configuration code allows all users into the main (virtual) directory but requires that users who want to access the PagesRequiringAuth subdirectory be authenticated:
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<configuration> <system.web> <authorization> <allow users="*" /> </authorization> </system.web> <location path="PagesRequiringAuth"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location> </configuration>
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