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Calling AddNumbers Starting main loop Starting AddNumbers In AddNumbers: Swing Dancing at the South Bank In main loop: 0: Swing Dancing at the South Bank In AddNumbers: Saturday Night Swing In main loop: 1: Saturday Night Swing In AddNumbers: Formula 1 German Grand Prix In main loop: 2: Formula 1 German Grand Prix In AddNumbers: Swing Dance Picnic In main loop: 3: Swing Dance Picnic In AddNumbers: Stompin' at the 100 Club In main loop: 4: Stompin' at the 100 Club Leaving AddNumbers Leaving main loop

Even though the main method calls AddNumbers only once, before the start of the loop, you can see from the output that the code flits back and forth between the main loop and AddNumbers for each item in the list. That s how yield return works it returns from the method temporarily. Execution will continue from after the yield return as soon as the code consuming the collection asks for the next element. (More precisely, it will happen when the client code calls MoveNext on the enumerator.) C# generates some code that remembers where it had got to on the last yield return so that it can carry on from where it left off.

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What we have just done is change the call to the search operation as if we typed it in the test harness. To see the results of the change, select Debug Continue. The results displayed in the test harness should reflect a search on Popfly , not Silverlight . This is the power of debugging the ability to make minor changes to see the impact on your code. VWD is a great tool for debugging your block JavaScript code. I would advise reading more about debugging in the VWD documentation to discover some of the other features available to you.

You might be wondering what happens if the consumer abandons the loop halfway through. If that happens, execution will not continue from the yield return. However, as you saw in Example 7-30, code that consumes an enumeration should have a using statement to ensure that the enumerator is always disposed of a foreach loop will always do this for you. The enumerator generated by C# to implement yield return relies on this to ensure that any using or finally blocks inside your enumerator method run correctly even when the enumeration is abandoned halfway through. This causes a slight wrinkle in the story regarding exception handling. You ll find that you cannot use yield return inside a try block that is followed by a catch block, for example, because it s not possible for the C# compiler to guarantee that exceptions will be handled consistently in situations where enumerations are abandoned.

This ability to continue from where we left off as the consumer iterates through the loop illustrates a subtler benefit of yield return: it doesn t just make the code slightly neater; it lets the code be lazy.

Another significant threat that e-commerce and financial institutions face are DoS attacks. In one type of DoS attack, the attacker sends so many packets to a web site that it cannot service the legitimate users that are trying access it. A financial institution or e-commerce site can end up losing money and revenue as the result of such a DoS attack because its customers will not be able to conduct transactions or make online purchases.

The AddNumbers method in Example 7-31 creates all of its output before it returns anything. We could describe it as being eager it does all the work it might need to do right up front. But the modified version in Example 7-32, which uses yield return, is not so eager: it generates items only when it is asked for them, as you can see from the output of Example 7-33. This approach of not doing work until absolutely necessary is often referred to as a lazy style. In fact, if you look closely at the output you ll see that the AddNumbers method in Example 7-33 is so lazy, it doesn t seem to run any code at all until we start asking it for items the Starting AddNumbers message printed out at the beginning of the AddNumbers method (before it starts its foreach loop) doesn t appear when we call AddNumbers as you can see, the Starting main loop message appears first, even though Main doesn t print that out until after AddNumbers returns. This illustrates that none of the code in AddNumbers runs at the point when we call AddNumbers. Nothing happens until we start retrieving elements.

Support for lazy collections is the reason that IEnumerable<T> does not provide a Count property. The only way to find out how many items are in an enumeration is to enumerate the whole lot and see how many come out. Enumerable sequences don t necessarily know how many items they contain until you ve asked for all the items.

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