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.NET/Java PDF, Tiff, Barcode SDK Library

This list class is an example of a collection class NET offers several of these, and they are so extremely useful that s 7, 8, and 9 are related to working with collections Notice the return keyword near the end of Example 2-17 This is how we return the information calculated by our method to whatever code calls the method As well as specifying the value to return, the return keyword causes the current method to exit immediately, and for execution to continue back in the calling method (In methods with a void return type, which do not return any value, you can use the return keyword without an argument to exit the method Or you can just let execution run to the end of the method, and it will return implicitly.

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public class CustomerSummary { public string Name { get; set; } public bool Active { get; set; } public string ServiceLevel { get; set; } public string OrderCount { get; set;} public string MostRecentOrderDate { get; set; } }

) If you re wondering how the method remembers where it s supposed to go back to, see the sidebar on the next page With the ReadNumbersFromFile method in place, we can now write this sort of code:.

Content types are probably one of the most important things to understand about Drupal. In this chapter, I discuss what content types are, how you can use them to your advantage, and how to create one. Content types also have fields associated with them, and I take an in-depth look at the various fields provided by Drupal. I close the chapter by discussing taxonomy terms, also called tagging, and how you can use tagging to relate one or more pieces of content.

double[] lapTimes = ReadNumbersFromFile("LapTimes.txt"); double[] fuelLevels = ReadNumbersFromFile("FuelRemainingByLap.txt");

The Mutex class provides a similar style of locking to monitor. The name is short for mutually exclusive indicating that only one thread can acquire the lock at any time. A mutex is significantly more expensive than a monitor because it always gets the OS scheduler involved. And it does that because mutexes work across process boundaries you can create a Mutex object with a name, and if another process in the same Windows login session creates another Mutex object with the same name, that

This model is intentionally simple; it consists mostly of strings. That s what we re representing, after all: text on a page. The logic that displays the data in this object will be straightforward; the view will only output it. The presentation model is designed to minimize decision making in the view.

object refers to the same underlying Windows synchronization object. So to acquire a Mutex, you don t merely have to be the only thread in your application in possession of the lock; you will be the only thread on the whole login session in possession of the lock. (You can even make a global mutex that spans all login sessions, meaning that yours will be the only thread on the entire machine in possession of the lock.) If you create a mutex without a name, it will be local to the process, but it still relies on the OS because a Mutex is essentially a wrapper around a mutex object provided by the Windows kernel.

Monitors are not just for locking, of course they offer coordination facilities through pulsing and waiting. And the .NET Framework offers some slightly more specialized types for coordination too.

The model for the entire table is of type IEnumerable<CustomerSummary>. With a simple model like that, the view only has to iterate through it, writing a row for each CustomerSummary. In the next section, we ll discuss the programmatic creation of the model.

Events provide a very similar service to the WaitForIt class we built in Example 16-14 an event is effectively a Boolean variable you can wait on. And rather than being a simple one-shot mechanism as in Example 16-14, an event can go back and forth between its two states. .NET offers ManualResetEvent and AutoResetEvent classes. The latter automatically reverts to its default state when letting waiting threads go, whereas the manual one remains in its so-called signaled state until you explicitly reset it.

I talked about the concept of a node in 1 and described how most content in Drupal is entered as a node (blocks and comments are the exception) A content type is a logical grouping of nodes that have many shared attributes, such as publishing options, display settings, comment settings, and more A node belongs to only one content type, but a content type can have an unlimited number of nodes Content types can also have an unlimited number of fields attached to them, such as image uploads, select fields, text boxes, tags, and others The result is a powerful mechanism to enter, organize, and display content I tend to think of nodes as objects, in the object-oriented programming sense That is, nodes are data structures that have a set of data fields and instructions on how to use those data fields when required.

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