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Like all the numeric types, int is a value type, so we end up with a rather different structure. As Figure 7-3 shows, the array elements are the values themselves, rather than references to values. Why would you need to care about where exactly the value lives Well, there s a significant difference in behavior. Given the numbers array in Example 7-12, consider this code:

int thirdElementInArray = numbers[2]; thirdElementInArray += 1; Console.WriteLine("Variable: " + thirdElementInArray); Console.WriteLine("Array element: " + numbers[2]);

Remember that the lines at the top of the code will load the block class using the componentManager add operation. Select Debug Start Debugging. A browser window will open with the test harness running. You should see Loaded Block:TechnoratiClass. displayed at the bottom of the harness window. Delete any code that is in the test harness code text box, and type the following (see Figure 9-13):

which would print out the following:

Variable: 6 Array element: 5

Because we are dealing with a value type, the thirdElementInArray local variable gets a copy of the value in the array. This means that the code can change the local variable without altering the element in the array. Compare that with similar code working on the array from Example 7-10:

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1999 Distributed firewalls Special issue on security, ;login:, November wwwusenixorg/publications/login/1999-11/features/firewallshtml Berners-Lee, Tim, and Dan Connolly 1995 Hypertext Markup Language 20 RFC 1866 (historic; obsoleted by RFC 2854), November wwwietforg/rfc/rfc1866txt Berners-Lee, Tim, Roy Fielding, and Larry Masinter 2005 Uniform resource identifier (URI): Generic syntax RFC 3986 (standard), January wwwietforg/rfc/rfc3986txt Berners-Lee, Tim, Roy T Fielding, and Henrik Frystyk Nielsen 1996 Hypertext Transfer Protocol HTTP/10 RFC 1945, May wwww3org/Protocols/rfc1945/rfc1945 Bishop, Matt 1995 A standard audit trail format In Proceedings of the 18th National Information Systems Security Conference, 136 145 Bishop, Matt, Christopher Wee, and Jeremy Frank 1996 Goal-oriented auditing and logging Submitted to IEEE Transactions on Computing Systems Blaze, Matt Oblivious key escrow 2002 In Information Hiding: First International Workshop, Cambridge, UK, May 30 June 1, 1996, Proceedings (LNCS 1174), 335 343 Berlin: SpringerVerlag Boneh, Dan 1999.

CalendarEvent thirdElementInArray = events[2]; thirdElementInArray.Title = "Modified title"; Console.WriteLine("Variable: " + thirdElementInArray.Title); Console.WriteLine("Array element: " + events[2].Title);

This would print out the following:

This shows that we ve modified the event s title both from the point of view of the local variable and from the point of view of the array element. That s because both refer to the same CalendarEvent object with a reference type, when the first line gets an element from the array we don t get a copy of the object, we get a copy of the reference to that object. The object itself is not copied. The distinction between the reference and the object being referred to means that there s sometimes scope for ambiguity what exactly does it mean to change an element in an array For value types, there s no ambiguity, because the element is the value. The only way to change an entry in the numbers array in Example 7-12 is to assign a new value into an element:

numbers[2] = 42;

Twenty years of attacks on the RSA cryptosystem Notices of the AMS 46 (2): 203 213 Bos, Bert, Hakon Wium Lie, Chris Lilley, and Ian Jacobs 1998 Cascading Style Sheets, level 2 (CSS2 specification) W3C recommendation, May 12 wwww3org/TR/REC-CSS2 Brooks, Frederick P 1995 The mythical man-month: Essays on software engineering New York: Addison-Wesley Bulba and Kil3r 2000 Bypassing StackGuard and StackShield Phrack Magazine 56 (5) wwwphrackorg/archives/56/p56-0x05 Burns, Jesse 2005 Cross site reference forgery Information Security Partners, wwwisecpartnerscom/files/XSRF_Paper_0pdf..

But as you ve seen, with reference types the array element is just a reference, and we may be able to modify the object it refers to without changing the array element itself. Of course, we can also change the element, it just means something slightly different we re asking to change which object that particular element refers to. For example, this:

events[2] = events[0];

causes the third element to refer to the same object as the first. This doesn t modify the object that element previously referenced. (It might cause the object to become inaccessible, though if nothing else has a reference to that object, overwriting the array element that referred to it means the program no longer has any way of getting hold of that object, and so the .NET Framework can reclaim the memory it occupies during the next garbage collection cycle.) It s often tempting to talk in terms of the fourth object in the array, and in a lot of cases, that s a perfectly reasonable approximation in practice. As long as you re aware that with reference types, array elements contain references, not objects, and that what you really mean is the object referred to by the fourth element in the array you won t get any nasty surprises. Regardless of what element type you choose for an array, all arrays provide various useful methods and properties.

t= new TechnoratiClass() t.getSearchResults("Silverlight")

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