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Sometimes it s useful to call the LINQ query operator methods explicitly, rather than writing a query expression. Some operators offer overloads with advanced features that are not available in a query expression. For example, sorting strings is a locale-dependent operation there are variations on what constitutes alphabetical ordering in different languages. The query expression syntax for ordering data always uses the current thread s default culture for ordering. If you need to use a different culture for some reason, or you want a culture-independent order, you ll need to call an overload of the OrderBy operator explicitly instead of using an orderby clause in a query expression. There are even some LINQ operators that don t have an equivalent in a query expression. So understanding how LINQ uses methods is not just a case of looking at implementation details. It s the only way to access some more advanced LINQ features.

You already saw the main filtering feature of LINQ. We illustrated the where clause and the corresponding Where operator in Example 8-2 and Example 8-3, respectively. Another filter operator worth being aware of is called OfType. It has no query expression equivalent, so you can use it only with a method call. OfType is useful when you have a collection that could contain a mixture of types, and you only want to look at the elements that have a particular type. For example, in a user interface you might want to get hold of control elements (such as buttons), ignoring purely visual elements such as images or drawings. You could write this sort of code:

var controls = myPanel.Children.OfType<Control>();

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In our example, host B sends its response to host A, not host M However, if the command is delete all files on the hard disk, an attacker such as M does not need to receive the results of the command in order to cause damage IP spoofing is possible for an attacker even if more than one round of communication is necessary Consider a scenario in which host B from the previous example sends a message that says Are you sure you want to delete all files in response to receiving the delete all files on the hard disk command, and waits for a response prior to actually issuing the command Now, one might hope that since host B would require an answer back from host A confirming the deletion, the attack could be foiled.

If myPanel.Children is a collection of objects of some kind, this code will ensure that controls is an enumeration that only returns objects that can be cast to the Control type. Although OfType has no equivalent in a query expression, that doesn t stop you from using it in conjunction with a query expression you can use the result of OfType as the source for a query:

var controlNames = from control in myPanel.Children.OfType<Control>() where !string.IsNullOrEmpty(control.Name) select control.Name;

This uses the OfType operator to filter the items down to objects of type Control, and then uses a where clause to further filter the items to just those with a nonempty Name property.

Query expressions can contain an orderby clause, indicating the order in which you d like the items to emerge from the query. In queries with no orderby clause, LINQ does not, in general, make any guarantees about the order in which items emerge. LINQ to Objects happens to return items in the order in which they emerge from the source enumeration if you don t specify an order, but other LINQ providers will not necessarily define a default order. (In particular, database LINQ providers typically return items in an unpredictable order unless you explicitly specify an order.) So as to have some data to sort, Example 8-10 brings back the CalendarEvent class from 7.

In this chapter, you have learned how to use the rich functionality within Microsoft s Visual Web Developer (VWD) to create blocks using the Popfly Block SDK. You ve learned how to edit a block s JavaScript file and block definition files in its editor. You ve also learned about VWD s debugging capabilities and how to use the Block SDK schema files to help write and validate block definition files. In the next chapter, we ll return to the Popfly web site and explore the Popfly block creation area.

class CalendarEvent { public string Title { get; set; } public DateTimeOffset StartTime { get; set; } public TimeSpan Duration { get; set; } }

However, our attacker on host M will still be able to delete all the files on B s hard disk One problem the attacker would need to solve is that when host A receives the Are you sure you want to delete all files message, Alice may say No because she never sent the delete command to begin with (and she probably does not want all her files to be deleted) Indeed, if host A receives the Are you sure you want to delete all files message, it might be an.

When examples in this chapter refer to an events variable, assume that it was initialized with the data shown in Example 8-11.

List<CalendarEvent> events = new List<CalendarEvent> { new CalendarEvent { Title = "Swing Dancing at the South Bank", StartTime = new DateTimeOffset (2009, 7, 11, 15, 00, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(4) }, new CalendarEvent {

};

}, new CalendarEvent { Title = "Formula 1 German Grand Prix", StartTime = new DateTimeOffset (2009, 7, 12, 12, 10, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(3) }, new CalendarEvent { Title = "Swing Dance Picnic", StartTime = new DateTimeOffset (2009, 7, 12, 15, 00, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(4) }, new CalendarEvent { Title = "Stompin' at the 100 Club", StartTime = new DateTimeOffset (2009, 7, 13, 19, 45, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(5) }

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