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Configuration HTTP pipeline Diagnostics and error handling Validation Data binding Custom controls Caching State management
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31 webconfig
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If you have configured a Web application with IIS before, many of the configuration settings available in webconfig will be familiar to you To begin with, let's see how to use the webconfig file to configure something simple, such as changing the session state timeout for an application At the top of your virtual root directory, you would create a new text file named webconfig, the contents of which specify a new value for the timeout attribute of the sessionState element, as shown in Listing 3-1 Listing 3-1 Sample webconfig File Changing the Session State Timeout
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Table <configuration> of Contents
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<systemweb> Essential ASPNET with Examples in C# <sessionState mode='Inproc' timeout='10' /> ByFritz Onion
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Publisher Pub Date
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</systemweb> </configuration>
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: Addison Wesley : February 11, 2003
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ISBN that the format of this file is standard XML, with a single top-level element named configuration : 0-201-76040-1 Note Pages of the :settings applied to ASPNET applications are elements within the <systemweb> element, so 432 Most
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that is the next element specified The sessionState element has a number of attributes, and even though in this case, we care about only the timeout attribute, we also have to specify the mode attribute because it is required for this element Once this file is placed at the root of our virtual directory, any subsequent requests will pick up the well-written book has extensive knowledge and priceless experience state timeout "This well-conceived and settings we have specified, which in our case means that the session overflowing would be set to 10 minutes, instead of the default 20 minutes A complete list of all the top-level elements from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and that apply to ASPNET applications and their purpose is Engineering, NASDAQcom architectural skill"-J Fred Maples, Director of Software shown in Table 3-1
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications Table 3-1 Top-Level Configuration Elements Available in webconfig This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the Purpose NET framework Subsequent chapters explore the host of new features in ASPNET, Element including the server-side compilation model, code-behind classes, server-side controls, form validation, the <authentication> Specify the client authentication mode to use data binding model, and custom control development Throughout the book, working examples illustrate <authorization> Allow or deny users or roles in C# best practices for building Web-based applications access <browserCaps> Specify browser capabilities based on user agent Among the topics explored in depth are: <clientTarget> Define client targets
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Control page compilation and assembly references ASPNET architecture <customErrors> Control error page display and define custom error pages
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<compilation>
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<globalization> Set the request and response encoding Web forms <httpHandlers> <httpModules> <identity>
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Configuration
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Add or remove HTTP handlers Add or remove HTTP modules Control aspects of HTTP request processing
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<httpRuntime> HTTP pipeline
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Specify impersonation for this application Diagnostics and error handling <machineKey> Control the validation and decryption key Validation <pages> Set defaults for page attributes globally
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<processModel>
Data binding
Control the behavior of the worker process
<securityPolicy> Define trust levels with associated policy files
Custom controls <sessionState> Control session state
<trace> Caching <trust>
Enable application-wide tracing
Select which trust level to use State management <webServices> Specify Web service protocols and extensions
<appSettings> [ Team LiB ]
Add application-specific data elements
311 Configuration Hierarchy
While it is most common to deploy a webconfig file at the root of your virtual root directory for an ASPNET application, there are several additional places where webconfig files can be placed ASPNET supports the hierarchical application of configuration settings in a top-down fashion Configuration files can be placed in four locations: machine, site, application, and subdirectory At the top of the hierarchy is a single, machine-wide configuration file called machineconfig, which contains the default settings for all ASPNET applications on that machine This file can be found in your $FRAMEWORK\CONFIG directory, where $FRAMEWORK is the path to the NET installation (typically something likec:\winnt\MicrosoftNET\Framework\v103705 ) The machineconfig file is the only required configuration file; all webconfig files are optional and are necessary only if you want to change some of the default settings of Contents machineconfig for your application Table defined in
Essential ASPNET to be consulted is the in C# The next configuration file with Examples webconfig file placed in the root directory of the Web
ByFritz Onion site Any configuration settings in this file are applied to all ASPNET applications running on that site
After that, : Addison Wesley Publisher the webconfig file at the root of the virtual directory of an ASPNET application is consulted, and any Pub Date configuration11, 2003 are applied to all pages and directories within that application : February settings
ISBN : 0-201-76040-1
Finally, you can also place webconfig files within subdirectories under the virtual root Any configuration : 432 settings in a subdirectory configuration file apply to all pages within that subdirectory or any subdirectories below it It is important to note that the subdirectory structure used to apply configuration settings is the one specified in the URL path, not the physical directory path on disk (although typically they mirror each other) "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It the hierarchy true essence of ASPNET an ASPNET application a high level ofdemonstrates Figure 3-1 shows captures the of configuration files for and walks the reader to This example technical and architectural skill"-J Fred Maples, Directorthe Software application living under the myvdir virtual directory, all the configuration files that would affect of ASPNET Engineering, NASDAQcom which is defined within the default site on the machine Note that when a request maps into a subdirectory Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through of the application, additional webconfig files may be applied to the processing for that request version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to buildConfiguration Files Figure 3-1 Hierarchy of robust and well architected Web applications