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both modes. The unit tests for this data access layer include load tests that measure the time it takes to load a large set of FavoriteLink objects and then display the average time for both modes. These load tests are included with the code downloads for this chapter. These load tests, when run with a high number of items, showed that the reflection cost does not have a significant impact on the time to load the data into the FavoriteLink objects. The performance has been refined to minimize the cost of reflection. The mappings created by using reflection are created once when the first object is loaded. The mappings are reused for every new instance so that the performance penalty is nearly eliminated while the benefits are gained. However, if you want to take advantage of directly casting the data columns to properties without using reflection, the load methods are marked as virtual so you can override them.

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Metaprograms are programs that generate or manipulate other programs, and metaprogramming is, of course, the writing of metaprograms Based on these definitions, you can see why the LINQ Expression examples in 2 are metaprograms They are metaprograms because, in those examples, we construct LINQ expression trees and use those trees to generate executable IL code The code we write to construct and compile LINQ expression trees is a metaprogram The programs manipulated by the metaprograms consist of code represented by the LINQ expression tree Similarly, the DLR Hosting API examples in 6 are metaprograms because those examples take Python code or Ruby code as input and manipulate the code by running it and interacting with it The DLR Hosting API examples are metaprograms and the Python code and Ruby code are the programs manipulated by the metaprograms It s common to see the concept of code as data in metaprograms.

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With the data access layer ready to use, we can now start assembling the website The data will be brought into the website by using ObjectDataSources that are associated with databound controls held in user controls The user controls can be placed on any page, wherever they are needed The pages will also use a single master page for the website The user controls created for the website will become the building blocks for the website, and these building blocks will interface directly with the data access layer A user control may then expose properties, methods, and events to the parent container to provide rich functionality for the user interface layer You may choose to start building the website with just large pages, but you will soon have pages with 2,000-line code-behind files, which are hard to organize and maintain.

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In the case of the LINQ Expression examples in 2, the LINQ expression trees are data that represent code elements, such as if conditions and while loops Once code is in the form of data (ie, expression trees), we can write metaprograms that manipulate the code as data In the case of the DLR Hosting API examples, the Python and Ruby code is data Once that code is in the form of data, we can write metaprograms that manipulate the code via the DLR Hosting API Metaprograms can generate or manipulate programs at compile time or at runtime An example of a metaprogram that manipulates a program at compile time is code generation If you are a C++ programmer and you use C++ macros in your code, you are doing compile-time metaprogramming.

The next command, local, is a shell builtin that restricts a variable s scope to the function (and its children), but the variable will not change in the parent process Setting IFS to a period causes word splitting at periods, rather than whitepace, when a parameter is expanded Beginning with bash-40, local and declare have an option, -A, to declare an associative array local IFS= The set builtin replaces the positional parameters with its arguments Since $IFS is a period, each element of the IP address is assigned to a different parameter set -- $1 The final two lines check each positional parameter in turn If it s greater than 255, it is not valid in a dotted-quad IP address If a parameter is empty, it is replaced with the invalid value of 666.

Starting with just a page is a good way to prototype a new interface, but ultimately you will want to break out the sections of a page into the user controls for maintainability and to take advantage of decoupling the various sections of a page into well-defined containers Ultimately, you may choose to convert a user control into a server control, which can be deployed purely as an assembly This conversion makes the control work well as a dependency on many websites with minimal effort A server control requires more work to create and maintain, so creating one from the start is not normally the best first step As a user control matures, it may eventually be a good candidate for conversion Currently, if you want to use a user control across multiple websites, you have to copy the .

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