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This code doesn t need to know what type T is and in fact T can be any type. If we want a wrapper for an int, we can write Wrapper<int>, and that generates a class exactly like the example, except with the T replaced by int throughout. Some classes take multiple type parameters. Dictionary collections (which are described in 9) require both a key and a value type, so you would specify, say, Dictionary<string, MyClass>. An instantiated generic type is a type in its own right, so you can use one as an argument for another generic type, for example, Diction ary<string, List<int>>. You can also specify a type parameter list for a method. For example, .NET defines an extension method for all collections called OfType<TResult>. If you have a List<object> that happens to contain a mixture of different kinds of objects, you can retrieve just the items that are of type string by calling myList.OfType<string>().

You may be wondering why .NET offers arrays when List<T> appears to be more useful. The answer is that it wouldn t be possible for List<T> to exist if there were no arrays: List<T> uses an array internally to hold its elements. As you add elements, it allocates new, larger arrays as necessary, copying the old contents over. It employs various tricks to minimize how often it needs to do this.

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multiple pieces of information, as programs often do, it s very common to need some flexibility around the amount of information fixed-size lists are the exception rather than the rule. (An individual s calendar tends to change over time, for example.) So have we just wasted your time with the first half of this chapter Not at all not only do arrays crop up a lot in APIs, but List<T> collections are very similar in use to arrays. We could migrate most of the examples seen so far in this chapter from arrays to lists. Returning to our earlier, nonrectangular example, we would need to modify only the first line of Example 7-10, which creates an array of CalendarEvent objects. That line currently reads:

It is followed by the list of objects to add to the array, contained within a pair of braces. If you change that line to this:

the initializer list can remain the same. Notice that besides changing the variable declaration to use the List<T> type (with the generic type argument T set to the element type CalendarEvent, of course) we also need an explicit call to the constructor. (Normally, you d expect parentheses after the type name when invoking a constructor, but those are optional when using an initializer list.) As you saw earlier, the use of new is optional when assigning a value to a newly declared array, but C# does not extend that courtesy to other collection types. While we can initialize the list in much the same way as we would an array, the difference is that we are free to add and remove elements later. To add a new element, we can use the Add method:

Thinking about firewalls In Proceedings of the Second International Conference on Systems and Network Security and Management (SANS-II) Rivest, R, A Shamir, and L Adelman 1978 A method for obtaining digital signatures and public-key cryptosystems Communications of the ACM 21 (2): 120 126 Schneider, Steve 1998 Formal analysis of a non-repudiation protocol In PCSFW: Proceedings of the 11th Computer Security Foundations Workshop, 54 65 Oakland, CA: IEEE Computer Society Press Schneier, Bruce 2000 Crypto-Gram Newsletter, May 15 wwwschneiercom/ crypto-gram-0005html 2004 The Witty worm: A new chapter in malware Computerworld, June 2 http://www computerworldcom/networkingtopics/networking/story/0,10801,93584,00html Schneier, Bruce, and John Kelsey 1999 Tamperproof audit logs as a forensics tool for intrusion detection systems Computer Networks and ISDN Systems Scott, George M 1977 Auditing large scale data bases VLDB, 515 522..

CalendarEvent newEvent = new CalendarEvent { Title = "Dean Collins Shim Sham Lesson", StartTime = new DateTimeOffset (2009, 7, 14, 19, 15, 00, TimeSpan.Zero), Duration = TimeSpan.FromHours(1) }; events.Add(newEvent);

This appends the element to the end of the list. If you want to put the new element somewhere other than at the end, you can use Insert:

XML-RPC is a remote procedure call protocol that uses XML to encode its calls and HTTP as a transport mechanism.

events.Insert(2, newEvent);

The first argument indicates the index at which you d like the new item to appear any items at or after this index will be moved down to make space. You can also remove items, either by index, using the RemoveAt method, or by passing the value you d like to remove to the Remove method (which will remove the first element it finds that contains the specified value).

List<T> does not have a Length property, and instead offers a Count. This may seem like pointless inconsistency with arrays, but there s a reason. An array s Length property is guaranteed not to change. A List<T> cannot make that guarantee, and so the behavior of its Count property is necessarily different from an array s Length. The use of different names signals the fact that the semantics are subtly different.

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