create barcode bitmap c# Part I The ASP.NET Runtime Environment in Visual C#

Generator QR in Visual C# Part I The ASP.NET Runtime Environment

Part I The ASP.NET Runtime Environment
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FIGURE 2-16 Predefined transformations of the web.config file.
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Here s how the root <configuration> element appears for transformation files:
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<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
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The element includes the definition of a new namespace whose suffix is xdt. The namespace refers to a specific XML schema used to express transformations required on the content of the file. You use xdt elements to insert commands in the configuration file to be processed during the publish process to apply transformations to the actual web.config file being deployed for a given configuration (debug, release, or any other one you want to support). Suppose, for example, that the web.config file you use for development purposes contains a <connectionString> node that needs be updated for a production install to target a real database. You edit the web.release.config file to contain the following:
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<connectionStrings> <add name="YourDatabase" xdt:Locator="Match(name)" xdt:Transform="Replace" connectionString="..." /> </connectionStrings>
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The Transform attribute indicates the operation to perform on the current element. In this case, you intend to perform a Replace. The Locator attribute, on the other hand, refers to the attribute to process. In the example, the target of the replacement is any attribute that matches the value of the name attribute. In other words, when processing the development web.config file, the Publish Wizard will try to locate any connection string entry there that matches the YourDatabase name. If any is found, the entire <add> subtree is replaced with the one provided in the transformation file.
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2 ASP.NET and IIS
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If you open up the Release transformation file that comes with the default Visual Studio ASP.NET template, you find the following:
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<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform"> <system.web> <compilation xdt:Transform="RemoveAttributes(debug)" /> </system.web> </configuration>
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The <compilation> element is definitely one that needs to be updated when you move to a production environment. The Transform element indicates that a given attribute the debug attribute must be removed. As a result, when the web.release.config file is transformed, the debug attribute is removed from the <compilation> element. The overall idea is that you write a base web.config file for the development environment and then express the delta between it and any other one you might need through transformations. At a minimum, you need a transformation for the release version for the configuration file. The delta results from the transformation applied via the XDT transform. The XDT processor is incorporated in the Web Deployment Tool. You can have a distinct transformation of the web.config for each build configuration you handle in your solution. Figure 2-17 shows how to define a custom build configuration. After you successfully add a new custom build configuration, you right-click the web.config file and select the Add Config Transform menu item. This will add a new web.Xxx.config file, where Xxx is the name of the new configuration. At this point, you can edit the file at will and add as many XDT tags as needed. The file transformation occurs only when you generate a deployment package from the Project menu.
FIGURE 2-17 Adding a new build configuration.
Part I The ASP.NET Runtime Environment
Site Precompilation
Another aspect related to deploying an ASP.NET application is the site precompilation. Every ASP.NET page needs an extra step of runtime compilation to serve its markup. As you ll see in the upcoming chapters, when you author an ASP.NET page you write a markup file (ASPX) plus a code-behind class using C#, Visual Basic, or any other supported .NET language. In a WSP scenario, you deploy markup and code-behind classes as is and wait for the users to make requests to have them compiled. In a WAP scenario, you deploy markup files and one or more assemblies containing the compiled code-behind classes. In both cases, the dynamic compilation step for each available page is still required at least the first time a given page is served. The WAP project type simply saves you from deploying the source code of your classes. In Visual Studio, when you attempt to publish a WSP project you are shown a different user interface than for a WAP project where a new term is introduced: site precompilation. In spite of this, site precompilation is a general ASP.NET feature and is not limited to WSP projects. It s the Visual Studio 2010 user interface that seems to limit it to Web site projects. Is site precompilation really useful Site precompilation consists of programmatically invoking all pages so that the ASP.NET runtime can process them as if a user had already invoked each. The benefit is that users won t experience any extra delay after the first request. In addition, you catch any compile-time errors that slipped into pages after the previous tests. Precompilation doesn t necessarily deliver a huge performance improvement; most of the time, it is a small-scale optimization instead. However, if you have pages that cache a lot of data and take a while to initialize, this little bit of speed can improve the user s perception of your application. Precompilation can take two forms: in-place precompilation and deployment precompilation. Note Site precompilation is sometimes sold as a feature that saves you from having to deploy
your source code to the production environment. This is definitely the wrong way to approach things. ASP.NET allows you to deploy pages with their source code-behind classes, but it doesn t mandate it. It s ultimately your choice, and the option has both pros and cons. If you don t want to deploy source code, just opt for a Web application project instead of a Web site project. Site precompilation can be applied to any ASP.NET project regardless of the type and in spite of the Visual Studio tooling support that for some reason is only offered if you opt for a WSP.
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