Additional Settings in .NET

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34 Additional Settings
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The best way to familiarize yourself with the various settings available for ASPNET applications is to open the machineconfig file on your system and peruse the elements Each element is carefully documented with available elements and attributes, and many examples are included It is also in this file that you can find out what the defaults for all of the ASPNET applications on your machine We discuss some of the additional elements in later chapters, wh they are more directly relevant to the topic at hand
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As you begin to develop ASPNET applications, you should be aware of two additional configuration elements: the assemblies element and the pages element If you find you are using the @Assembly directive to add a reference t GAC-deployed assembly to several pages in an application, you can instead reference that assembly once globally in t application'swebconfig file using the assemblies element For example, suppose you have built a utilities assembl Table of Contents called Util that contains a number of utility classes used throughout the applications on your server If you decide to Essential ASPNET with you can add anin C# reference to the assembly to all pages in your application by Examples implicit deploy this assembly in the GAC, ByFritz Onion adding it to the assemblies element in your root webconfig file, as shown in Listing 3-7
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Publisher Pub Date ISBN
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Listing 3-7 Adding an Application-wide Reference to a GAC-Deployed Assembly
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: February 11, 2003 : 0-201-76040-1
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: Addison Wesley
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Pages : 432 <configuration>
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<! > <systemweb> <compilation> "This <assemblies> and well-written book has extensive knowledge and priceless experience overflowing well-conceived from its<add assembly="Util, Version=1000, and walks the reader to a high level of technical and pages It captures the true essence of ASPNET Culture=neutral, PublicKeyToken=a77a5c561934e08 </assemblies> architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom </compilation> </systemweb> Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through </configuration> version 11 It provides experienced programmers with the information needed to fully understand the
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technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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Similarly, begins with a discussion of the rationale behind the design of ASPNET and an introduction application, you This book if you find that you are repeating the same @Page directives for many of the pages in your to how instead on the pages element in your Subsequent chapters explore file to change the default for many of it buildsuse top of the NET framework application-wide webconfigthe host of new features in ASPNET, the @Page including attributes For example, suppose you wanted to disable view state for all pages in your application by defaul directive the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom controlnecessary to doThroughout the book, working examples illustrate Listing 3-8 shows the configuration file development this best practices for building Web-based applications in C# Listing 3-8 Using the pages Element Among the topics explored in depth are:
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<configuration> ASPNET architecture <! > <systemweb> Web forms <pages enableViewState='false' /> </systemweb> Configuration </configuration>
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HTTP pipeline Diagnostics and error handling [ Team LiB ] Validation Data binding Custom controls Caching State management
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[ Team LiB ]
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35 Reading Configuration Information
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We have already seen how to retrieve values stored in the AppSettings element by calling ConfigurationSettingsAppSettings["xxx"], where xxx is the key we used to index the value This static indexer is actually a convenience wrapper around a more general way of retrieving any configuration setting element through the ConfigurationSettingsGetConfig() method, as shown in Listing 3-9 Listing 3-9 Reading Configuration Settings
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object settings = Table of Contents ConfigurationSettingsGetConfig("appSettings"); NameValueCollection nvc = settings as in C# Essential ASPNET with Examples NameValueCollection; if (nvc != ByFritz Onion null) { string val = (string)nvc["xxx"]; Publisher : Addison Wesley }
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Pub Date ISBN : February 11, 2003 : 0-201-76040-1
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Pages : 432 Any configuration element (except the processModel element) can be retrieved using this technique
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Internally, this maps into a request for the cached settings of the configuration file for that element, and if they have not yet been cached, a request to read them At the lowest level of the configuration hierarchy, the physical XML files on disk are read by a class called ConfigurationRecord, using the XmlTextReader class well-conceived and well-written book has extensive knowledge and priceless experience overflowing "This to efficiently pull in the configuration data Configuration information is parsed and stored on demand, so if its pages It captures the true essence of requested, it will never be read a high level of memory from a particular configuration element is neverASPNET and walks the reader toand loaded intotechnical and The job of parsing individual sections of the configuration file falls to NASDAQcom architectural skill"-J Fred Maples, Director of Software Engineering, configuration section handlers Conceptually, all ASPNET configuration files are divided into two sections: the configuration section handlers Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through and the configuration data Until now, we have been adding information to the to fully understand the version 11 It provides experienced programmers with the information needed configuration data section only and have not a clear guide the configuration section robust portion architected Web applications technology, and is even includedto using ASPNET to build handlerand well in our webconfig files If you look at the machineconfig file on your system, however, you will see that the top of the file includes a This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how number of configuration section handlers it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, The job of a server-side section handler is code-behind classes, server-side controls, which makes this including theconfigurationcompilation model, to parse a portion of the configuration file, form validation, the configuration file format custom control development Throughout the for reading in examples the file are data binding model, and extremely extensible The classes responsible book, working portions ofillustrate not practices for building Web-based read, at which point bestestablished until the file is actuallyapplications in C# instances of each parser object are created and passed the portion of the file they are responsible for Figure 3-4 shows this relationship in a portion of the systemwidemachineconfig file Note Among the topics explored in depth are:that the compilation section of the configuration file is parsed by a class called CompilationConfigurationHandler, specified under the configSections element It also falls under a sectionGroup element, which further scopes the name of the section it will parse in this case, ASPNET architecture to be under an element named systemweb The other configuration section handler shown in this sample is the one for appSettings Notice that this element is parsed by a class called Web forms NameValueFileSectionHandler and is a top-level element in the configuration file
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Configuration HTTP pipeline Diagnostics and error handling Validation Data binding Custom controls Caching State management