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Iterator blocks are treated differently than other blocks. Other blocks contain sequences of statements that are treated imperatively. That is, the first statement in the block is executed, followed by the subsequent statements, and eventually control leaves the block. An iterator block, on the other hand, is not a sequence of imperative commands to be executed at one time. Instead, it s declarative; it describes the behavior of the enumerator class you want the compiler to build for you. The code in the iterator block describes how to enumerate the elements. Iterator blocks have two special statements: The yield return statement specifies the next item in the sequence to return. The yield break statement specifies that there are no more items in the sequence.

A ListBox is a collection of items displayed to the user, from which he or she can select one or more items. The following are some important things to know about ListBoxes: As with all ItemsControls, the items in the ListBox can be of any type derived from the UIElement class, including Images and Buttons. By default, a ListBox sets its width to the width of its widest item.

This will have other effects besides just re-enabling Deny, and Request* though, so its use should generally be as a last resort. In general, uses of Deny were a latent security hole, we ve found that most people tend to need LegacyCasPolicy in order to continue to use the old policy APIs (CodeGroups, etc) before they cut over to the newer sandboxing model.

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The compiler takes this description of how to enumerate the items and uses it to build an enumerator class, including all the required method and property implementations. The resulting class is nested inside the class where the iterator is declared. You can have the iterator produce either an enumerator or an enumerable depending on the return type you use for the iterator block, as shown in Figure 20-8.

For un-hosted code, Microsoft now recommends that security policies are applied by using Software Restriction Policies (SRPs,), which apply to both managed and unmanaged code. Hosted code applications (e.g., ASP.NET and ClickOnce) are responsible for setting up their own policies.

Figure 20-8. You can have an iterator block produce either an enumerator or an enumerable depending on the return type you specify.

There are two forms in which you can place items into a ListBox s Items collection either by explicitly wrapping each item in a ListBoxItem element or by just placing them in the collection and letting the system implicitly wrap them. You can place items in the ListBox s Items collection by creating ListBoxItem elements and placing those elements in the content part of the ListBox, as shown in the following markup. This example inserts three strings into the ListBox. Figure 6-20 shows this window on the left. <ListBox> <ListBoxItem>Sweetie</ListBoxItem> <ListBoxItem>Darwin</ListBoxItem> <ListBoxItem>Florence</ListBoxItem> </ListBox> You can place items in the ListBox s Items collection, even without explicitly creating ListBoxItems for them, as shown in the following markup. Rather than creating explicit ListBoxItems, it inserts two TextBlocks and a Button. Figure 6-20 shows this window on the right. <ListBox> <TextBlock>Sweetie</TextBlock> <TextBlock>Darwin</TextBlock> <Button>Florence</Button> </ListBox>

The following code illustrates how to use an iterator to create an enumerable class. MyClass uses iterator method BlackAndWhite to produce an enumerator for the class. MyClass also implements method GetEnumerator, which in turn calls BlackAndWhite, and returns the enumerator that BlackAndWhite returns to it. Notice that in Main, you can use an instance of the class directly in the foreach statement since the class is enumerable.

SecAnnotate is a new tool contained in the .NET 4.0 SDK that analyzes assemblies for transparency violations.

Figure 6-20. The items in a ListBox can be added as ListBoxItems or as raw elements, in which case the system implicitly wraps them in ListBoxItems.

class MyClass { public IEnumerator<string> GetEnumerator() { return BlackAndWhite(); } Returns an enumerator public IEnumerator<string> BlackAndWhite() { yield return "black"; yield return "gray"; yield return "white"; } } class Program { static void Main() { MyClass mc = new MyClass(); Use the instance of MyClass. foreach (string shade in mc) Console.WriteLine(shade); } } This code produces the following output: black gray white

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