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OK, so you are working on why something went wrong in the code, and you want to try something different without having to stop and restart the test harness. Let s say you need to change a variable to another value. You can do this in the VWD Locals window. This window shows all of the variables that are defined in your JavaScript code. You can inspect the values and even change the values if the code is paused in a breakpoint. It should already be showing at the bottom to the VWD window. But you can show it by selecting Debug Windows Locals (see Figure 9-21). The Locals window has a list of all of the objects (some created by you, others created by other code) that you can inspect and change. You can see the reqUrl variable in the list also.

Since List<T> and arrays both implement IEnumerable<T>, this modified code in Example 7-30 will now work with List<string>, as well as arrays, or any other collection class that implements IEnumerable<string>. For more information on the subtleties of type compatibility and enumerations, see the sidebar on the next page.

Suppose you ve written a function that uses an enumeration of elements of some base type, perhaps an IEnumerable<FirefighterBase>. ( 4 defined FirefighterBase as a base class of various types representing firefighters.) For example:

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Prior to the advent of pay-per-click advertising, the threat of click fraud never existed. Pay-perclick advertising is an Internet advertising model in which advertisers provide advertisements to search engines. Search engines work with web site publishers to insert advertisements not only on search result pages, but also on publisher s content pages. The idea is that the entire page of content on a publisher s site is considered a query for the search engine, and relevant ads are inserted on the publisher s web page. Advertisers pay the search engine whenever users click on those advertisements. Web site publishers typically receive a revenue share for clicks on ads that occur on their site. Advertisers usually set a maximum daily budget for their advertising campaigns so that their advertising costs do not go unbounded. Such a pay-per-click advertising system can be abused in several ways. We will describe two of them. In one type of click fraud, an advertiser will click a competitor s ad with the intention of maxing out their competitor s budget. Once their competitor s budget has been exhausted, their ads may exclusively be shown to legitimate users. Such an attack ends up wasting the competitor s financial resources, and allows the attacker to receive all the legitimate ad clicks that their competitor might have received. In another type of click fraud, a web site publisher will click on ads shown on their own web site in an attempt to receive the revenue share for those clicks. In some cases, the fraudulent publisher can hire a third-party firm or deploy malware to click on the ads.

static void ShowNames(IEnumerable<FirefighterBase> people) { foreach (FirefighterBase person in people) { Console.WriteLine(person.Name); } }

What would you expect to happen if you tried to pass this method an IEnumera ble<TraineeFirefighter>, where TraineeFirefighter derives from FirefighterBase It seems like it should work ShowNames expects to get a sequence of FirefighterBase objects, and since TraineeFirefighter derives from FirefighterBase, an IEnumera ble<TraineeFirefighter> will return a sequence of objects that are all of type Firefight erBase (as well as being of type TraineeFirefighter). In C# 4.0, this works as you d expect. But it didn t in previous versions. In general, it s not safe to assume that types are necessarily compatible just because their type arguments happen to be compatible. For example, there s an IList<T> interface which defines an Add method. IList<TraineeFirefighter> cannot safely be converted to IList<FirefighterBase>, because the latter s Add method would allow anything derived from FirefighterBase (e.g., Firefighter, TraineeFirefighter) to be added, but in practice the implementer of IList<TraineeFirefighter> might not allow that it might accept only the TraineeFirefighter type.

IEnumerable<T> works here because the T type only ever comes out of an enumeration; there s no way to pass instances of T into IEnumerable<T>. The interface definition states this as Example 7-29 shows, the type argument is prefixed with the out keyword. In the official terminology, this means that IEnumerable<T> is covariant with T. This means that if type D derives from type B (or is otherwise type-compatible maybe B is an interface that D implements), IEnumerable<D> is type-compatible with IEnumerable<B>.

Generic arguments can also be prefixed with the in keyword, meaning that the type is only ever passed in, and will never be returned. The IComparable<T> interface we saw earlier happens to work this way. In this case, we say that IComparable<T> is contravariant with T it works the other way around. You cannot pass an IComparable<Train eeFirefighter> to a method expecting an IComparable<FirefighterBase>, because that method might pass in a different kind of FirefighterBase, such as Firefighter. But you can pass an IComparable<FirefighterBase> to a method expecting an ICompara ble<TraineeFirefighter> (even though you cannot pass a FirefighterBase to a method expecting a TraineeFirefighter). An IComparable<FirefighterBase> is capable of being compared to any FirefighterBase, and is therefore able to be compared with a TraineeFirefighter. By default, generic arguments are neither covariant nor contravariant. C# 4.0 introduced support for variance because the absence of variance with collection interfaces just seemed wrong IEnumerable<T> now works like most developers would expect.

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