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Lessons learned You need to think about the complexity of LINQ to Objects queries. Because we deal with lists and loops, it s particularly important to try to spare CPU cycles if possible. Keep in mind that you should avoid writing queries that iterate collections more than once; otherwise your queries may perform poorly. In other words, you don t want to waste your time counting chocolate chips again and again. Your goal is to find the cookie quickly, so you can attack the next one without delay. You also need to take into account the context in which they will be executed. For example, the same scenario in the context of a LINQ to SQL query would be very different because LINQ to SQL interprets queries in its own way, which is dictated by what the SQL language supports. The conclusion is that you should use LINQ to Objects wisely. LINQ to Objects is not the ultimate solution for all use cases. In some cases, it may be preferable to use traditional approaches, such as for and foreach loops. In other cases, you can stick to LINQ, but it s better to create your own query operators for optimal performance. There s a lesson from the Python philosophy: write everything in Python for simplicity, readability, and maintainability, and optimize what you need in C++. The analog here is: Write everything in LINQ, and optimize when you must using domain-specific operators. In this section, we have mainly compared different solutions that use LINQ. In the next section, we ll focus on comparing LINQ solutions to traditional ones. The goal is to give you an idea of LINQ s overhead.

But before you do that, be aware that, although Windows Movie Maker is able to generate a time stamp as a default name for each clip captured from a digital camera, it does not store that time-stamp information as a property of the clip As Figure 22-4 shows, the properties dialog box for a clip (which you can inspect in the usual way, by right-clicking and choosing Properties) provides data about the clip s duration, time offset within its source file, video and audio parameters (bit rate, frames per second, height, width, and so on), but aside from that default name there is no indication of when the clip was shot If you switch your Collections pane from Thumbnails view to Details view, you will find a column named Date Taken Alas, this misnamed column reports the capture date, not the shoot date.

disable site link transitivity:

Nor will you find the shoot date by inspecting the properties of the clip s source file (the wmv or avi file that you captured and stored on your hard disk) Again, the source file s properties will tell you when the video was captured, but not when it was recorded..

Site Link Bridges A site link bridge connects two or more site links in a transport where transitivity has been disabled in order to create a transitive and logical link between two sites that do not have an explicit site link. For example, in Figure 5-1, site link Ber-Lu connects the Bern and Lucerne sites. Site link Lu-Zur connects the Lucerne and Zurich sites. Site link bridge Ber-Lu-Zur connects site links Ber-Lu and Lu-Zur. Because site links are transitive by default, it is seldom necessary to create site link bridges. In other words, if site link transitivity is enabled, then manually creating a site link bridge is redundant and has no effect. However, if site link transitivity is disabled, you need to manually create a site link bridge if a transitive link is required to handle your organization s replication strategy.

22

This section contains information about editing the registry. Using the Registry Editor incorrectly can cause serious damage to your operating system. Use the Registry Editor at your own risk.

LINQ to Objects is fantastic because it allows you to write code that is simpler to read and write. Coding some of the operations that LINQ to Objects allows on

Figure 22-3. Freshly captured clips arrive in a folder named to match the name of the source file; the clips themselves are named by their date-and-time stamps, if they originated in a digital camcorder.

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