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WMI methods aren t documented in PowerShell s built-in help system; you ll need to use a search engine (usually searching on the WMI class name) to locate WMI method instructions and examples. Methods of non-WMI objects are also not available in
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and ClearType and grayscale font smoothing. Silverlight also includes the TextBlock element, which may be used to display read-only text. Though typically used for things such as field labels and description paragraphs, the TextBlock supports multiple Runs of text, each with their own distinct attributes. Any text element in Silverlight can take advantage of embedded fonts. Embedded fonts are useful for situations where you have a custom font or one that s unlikely to be on end-user machines. Rather than compromise and use a different font, you can embed the font or a subset of the glyphs in the font directly into your application. Silverlight has several ways for entering and displaying text. There s significant overlap between them, but each has its own niche where it performs best. Table 9.4, adapted from information from MSDN, shows how you should think of each control or element when trying to decide between them.
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We mentioned earlier that you can have multiple calendars displayed on your iPad. This option allows you to choose which calendar will be your Default calendar. That means that when you go to schedule every new appointment, this calendar will be selected by default. If you wish to use a different calendar say, your Work calendar you can change that when you actually set the appointment, as shown earlier in this chapter.
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s Note The best practice for modifying a script in MOM is to create a copy of the script
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This chapter explained how to handle legacy databases when you re writing the mapping. NHibernate supports the mapping of natural and composite keys. As a last resort, you can implement user types to handle custom situations. It s also possible to work with a database using triggers. After explaining how to implement and map the domain model s data, we moved to its business logic. We explained what persistence ignorance means and how to write a clean domain model that s free of unwanted dependencies. Then, we explained how the different kinds of business logic should be implemented. We also gave you some advice about errors to avoid. When you ve completed the domain model, you need to display it. This is where data binding comes into play. As you saw, doing it correctly can require quite a bit of work. We completed this chapter by looking at how you can obtain a DataSet from an entity s content. Although this process may require a lot of time at first, it can be automated. This chapter was just an introduction to the real world of domain models. You may need to do some research to find the perfect answer for your needs, and we hope the resources we ve mentioned will keep you busy for a while. Now, it s time to move to the persistence layer. So far, you ve been writing simple, short persistence operations that act on similar entities. Let s step back and look at the architectural issues that accompany writing a functional persistence layer in the real world.
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When setting the Left and Top positions in XAML, it more or less looked like we were setting properties on the Button, even though we knew that the properties belonged to the Canvas. When we re writing code, we can no longer hide this fact e. The Button does not have a Left or Top property. You may notice, though, that we re not exactly setting the Left on the Canvas (canvas1) either; we re calling a static method on the Canvas class called SetLeft(). SetLeft() takes the Control and the value for Left as arguments, but note that it doesn t take a reference to the Canvas. It s decorating the Button with some information that doesn t mean anything to the Button. When the Canvas looks at the Button, it looks at that decoration and says, Aha, this Button wants to be positioned 119 pixels from the left edge. You ll see this throughout WPF property values that don t belong to a control are nonetheless attached to the control for another control s consumption. Finally, we add the Button to the collection of Children for the Canvas f. All the layout Panels have a Children collection to contain the controls they own. We then add the other two Buttons g, h with slightly different property values. Note that the Padding property i takes a Thickness object that holds values for each edge. If you now run the application, you ll get something like figure 4.10. Note that this looks exactly the same as figure 4.6. This could be because we figured we could get away with copying and pasting the same screenshot, but it s mainly because there s no functional difference between the XAML approach and the programmatic approach. In a real-world example, it s unlikely that you d only create standard controls to add to a Canvas. It s more likely that you d respond to events and method calls and dynamically create appropriate content. The way you d do this is much the same as you see here. Even though the Canvas layout panel is the Figure 4.10 The Canvas layout with child elements added programmatically simplest of the panels to understand, we ve spent more time talking about it than we ll spend on the other layout panels. We spent so much time on this panel because we wanted to talk about and show the mechanisms behind the panels. No matter how complex the layout, these concepts won t change. But each of the following layout panels does have its own set of properties and behaviors.
Perhaps it s more instructive to consider what s missing from figure 1.4. For example, there are no CORBA or DCOM components. Instead, we leverage the Web server using ASP.NET s XML Web services infrastructure to expose system functions to remote callers. Neither do we employ any additional servers or filters to support multiple mobile devices such as Web-enabled phones and hand-held PCs. We use the controls from the Mobile Internet Toolkit to take care of detecting and supporting multiple devices. Although not evident in figure 1.4, no special steps are taken to support multiple browsers. Instead, we use ASP.NET controls that automatically take care of browser compatibility issues. This means that our ASP.NET applications can take advantage of the extended features of higher-level browsers, while automatically producing plain old HTML for older browsers. This example depicts a moderately complex system involving multiple interfaces and different user types, including bank staff, customers, and business partners, who
The process of testing software is, and likely always will be, inherently a spiky activity. Companies aren t always testing. Even in software groups that employ the most rigorous agile methodologies, it s unlikely that automated tests are running 24x7 if only because the humans who trigger those tests by making software changes aren t working around the clock. For this reason, testing is quickly becoming one of the killer apps for cloud computing.
The first bold section shows the filename used to store your data. You can actually give this any name you like: a.b, for example. The second bold section is where you choose the storage format. Your choices are NSXMLStoreType (the default, as an XML file), NSSQLiteStoreType (for a SQLite database), or NSBinaryStoreType (for the more traditional binary data format used for Mac OS X data stores before the days of Core Data). Generally speaking, the XML format is the best option to use during development, as it is easy to make changes to your data model and also to inspect the data file using external tools such as XML editors. When you go into production you may want to change over to one of the other storage formats SQLite is more scalable than XML if your database is likely to grow.
The body of the loop will spin for each element in the array, with the variable string holding each array value. It s much more concise than the enumerator syntax and much faster. Like all the new Objective-C 2.0 features, this is not available on Tiger (Mac OS X 10.4). If you or your users need to run your programs on Tiger, you can t use this new syntax. Bummer. OK, so now we have three ways to iterate through an array: by index, with NSEnumerator, and now with fast enumeration. Which one do you use If you re only going to be running on Leopard or later OS versions, use fast enumeration. It s more succinct and much faster. If you need to support Tiger, go the NSEnumerator way. Xcode includes a refactoring to convert code to Objective-C 2.0 and will automatically convert NSEnumerator loops into fast enumeration. Only use -objectAtIndex if you really need to access things by index, like if you re skipping around the array (for example, accessing every third object in it) or if you are iterating through multiple arrays at the same time.
What are aggregations
Terminology and Culture Shock
Select the Delete item from the control s context menu, or simply click on the control and press the Delete key.
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