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tionship mapped to a class association. For example, suppose you store the User s name in log records instead of mapping an association from LogRecord to User. The classes don t know anything about each other, because they aren t associated. You can then find all the Users and their LogRecords with the following theta-style join:
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Table 11.2 Mapping of XML to database for Book attributes Location in XML /Items/Item/ItemAttributes/Title /Items/Item/ItemAttributes/ISBN /Items/Item/ItemAttributes/PublicationDate /Items/Item/ItemAttributes/ListPrice/FormattedPrice Location in database Book.Title Book.ISBN Book.PubDate Book.Price
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To set the date and time, touch the Set Date & Time button to see the pop-up window with the wheels that rotate as you touch and move them. In Figure 1 17, you touch and slide the hour wheel and to move it upwards to change the time from 10 to 11.
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An icon taken from an ImageList instance is associated with each node. An alternate icon from the ImageList can be displayed when a node is selected.
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Maintaining state One not-so-obvious aspect of working with embedded code is that you can maintain state in it. For example, you can use class-level members to preserve the values of the variables between calls to embedded code methods from the moment the report processing starts until the report is fully processed. We will demonstrate this technique in the forecasting example that we will explore in section 6.2. Please note that state can be maintained within the duration of single report request only. As we explained in chapter 2, the RS report-processing model is stateless. For this reason, the report state gets discarded at the end of the report processing. Reporting Services is a web-based application, and just like any other web application, once the request is handled, its runtime state gets released. For this reason, subsequent requests to the same report cannot share state stored in class-level variables. Let s now look at a practical example where embedded code can be useful. Writing embedded code You can write embedded code to create reusable utility functions that can be called from several expressions in your report. Let s examine an example of how we can do just that. Suppose that the Adventure Works users have requested that we change the Territory Sales Crosstab report to display N/A when data is missing, as shown in figure 6.1.
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Frequently, you ll use a variable in a loop that changes value each time through the loop. In our example, the variable i was incremented by one each time through the loop. The first time through the loop, i had a value of 1. The second time, i had a value of 2. Variables that maintain a value based on the number of times through a loop are known as counters. In the interest of clarity, some programmers use names like counter or loopCounter. The nice thing about names like i, j, and k is that they don t get in the way, as they don t take up a lot of space on the line. On the other hand, your goal should be to make your code as readable as possible, so it would seem that a name like counter would be better than the uninformative i, j, or k. One popular compromise holds that the closer a variable s use is to its declaration, the shorter its name can be. Once again, pick a style you are comfortable with, and stick with it!
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A Smart playlist is one that iTunes creates for you based on your selections. You can create a Smart playlist for your top 10 songs that you play all the time, specific artists, a specific genre, or even limit the playlist to a certain size based on the number of songs or their size (in MB or GB). To start creating a Smart playlist, select File New Smart Playlist. Or, you can press Ctrl + Alt + N (Windows) or Command + Alt + N (Mac), and then select New Smart Playlist from the File menu. Figure 30 13 illustrates that you have many options for creating a Smart playlist. All of the default playlists you see in iTunes are Smart playlists. Default categories include 90 s Music, Classical Music, Music Videos, My Top Rated, Recently Added, Recently Played, and Top 25 Most Played.
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extern int screamingZombieHitCount; extern void killAZombie( Zombie *victim ); The statement in Listing 2-16 declares that some other module has defined a global integer variable named screamingZombieHitCount (from Listing 2-13) and a C function named killAZombie. The module is compiled with the assumption that this variable and function exist in some other module, or
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In chapter 2 we discussed commonly used RAID levels such as RAID 0 and RAID 10, both of which stripe data across multiple disks. Striping works by dividing data to be written to disk into chunks and spreading the chunks over the separate disks in the RAID array. When the data is read, the RAID controller reads the individual chunks from the required disks and reconstructs the data into the original format. The RAID stripe size, not to be confused with the allocation unit size, determines the size of each chunk of data. Setting the stripe size too small will create additional work for the RAID controller in splitting and rejoining requested data. The best RAID stripe size is a contentious issue, and there s no single best answer. Storage vendors, particularly for their enterprise SAN solutions, typically optimize the stripe size based on their expert knowledge of their systems. In almost all cases, the best option is to leave the existing default stripe size in place. Changes should be verified with the storage vendor and undergo thorough tests to measure the performance impact before making the change to a production system. Once the RAID array is built, the next task is to create one or more partitions on the array that prepares the disk for use by Windows. As you ll see shortly, disk partitions should be built using the diskpart.exe tool, which provides a method to offset, or align, the partition.
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This example uses a Horizontal StackPanel as the ItemsPanel B to arrange the Items in the ListBox horizontally. It s highly likely that you ll only use a StackPanel as an ItemsPanel. Although you can technically use another Panel element, the other options require actual code. This code will be based entirely on your particular situation, so we won t cover that topic in this section. The ControlTemplate class enables you to redefine the way a Control looks. This new definition can use the target Control property values through a TemplateBinding. When it comes to displaying the Content of a ContentControl, you should use a ContentPresenter within a ControlTemplate. If this ControlTemplate is associated with an ItemsControl, you may need to use an ItemsPresenter to show the Items. These Items can be rendered in new ways thanks to the ItemsPanel property. Once you ve settled on a ControlTemplate, you may want to use it across multiple controls. Thankfully, Silverlight makes it easy to create reusable templates.
Importing by Manually Dragging and Dropping
External Assembly Aliases
Network Clients Allow/deny transactions with network clients over the network Transaction Internet Protocol (TIP) Transactions Allow/deny TIP transactions All of these options are pretty straightforward except for the last one. TIP is a protocol that can be used between heterogeneous transaction coordinators over the Internet. Basically, it allows you to use the DTC over the Internet, instead of being limited to your intranet (i.e., due to the firewall issues that plagued DCOM). Also in this section, you can allow or deny XA transactions. XA is a standard that enables resource managers that are running on other systems to participate in a DTC transaction. For example, you can use an XA transaction to participate in an IBM Customer Information Control System (CICS) transaction running on a mainframe. The second section allows you to specify a context account for the DTC. The default is the NetworkService account, though you can use a specific domain account for the DTC context. After you make your selections in the Security Configuration dialog box, click OK. You ll be returned to the MSDTC tab of the Properties box. The final configuration option on the MSDTC tab is Tracing Options, which determines how your transactions will be traced throughout their lifetime. When you click the Tracing Options button, you ll see the dialog box shown in figure 6.8. Here, you can select from these output options: Trace Output Enable/disable DTC trace output Trace Transactions Enable/disable transaction tracing Trace All Transactions Enable/disable tracing of all transactions Trace Aborted Transactions Enable/disable tracing of aborted transactions Trace Long-Lived Transactions Enable/disable tracing of long-running transactions
Listing 1-14. Using an Index with Select
Transition effects
Adapted Object Type .NET Adapter
Figure 22 8. Using Google Street View.
That s it for menus in .NET. In this chapter we showed how both menu bars and context menus can be created, modified, and handled within the .NET Framework by adding these controls to our MyPhotos application. We looked at submenus, and showed how a single event handler can be used by multiple menu objects. The shared event handlers we created supported both our menu bar as well as our context menu. The contents of our context menu were cloned, or copied, based on the contents of the top-level View menu so that the behavior and processing of both constructs were identical. We also examined some C# keywords such as the is, in, and foreach keywords, as well as the bool type. We looked at the Properties window in Visual Studio .NET in more detail, and used this window to add various events to our program. Future chapters will rely on our knowledge of menus and the C# and Visual Studio items we have learned here. The next chapter will take us to the bottom of the application window, where the status bar normally resides.
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