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Enumerable classes and enumerators are used extensively in the .NET collection classes, so it s important that you know how they work. But now that you know how to create your own enumerable classes and enumerators, you might be pleased to learn that, starting with C# 2.0, the language got a much simpler way of creating enumerators and enumerables. In fact, the compiler will create them for you. The construct that produces them is called an iterator. You can use the enumerators and enumerables generated by iterators wherever you would use manually coded enumerators or enumerables. Before I explain the details, let s take a look at two examples. The following method declaration implements an iterator that produces and returns an enumerator. The iterator returns a generic enumerator that returns three items of type string. The yield return statements declare that this is the next item in the enumeration.

Figure 6-18. An Expander in contracted and expanded states The following markup produces the Expander shown in Figure 6-18. <Grid> <Expander Header="Important Buttons"> <StackPanel> <Button>Button 1</Button> <Button>Button 2</Button> <Button>Button 3</Button> </StackPanel> </Expander> </Grid>

There are a number of security changes: Applications that are run from Windows Explorer or network shares run in full trust. This avoids some tediousness because prior to .NET 4.0 local and network applications would run with different permission sets. Applications that run in a host (for example, ASP.NET, ClickOnce, Silverlight, and SQL CLR) run with the permissions the host grants. You thus need worry only that the host grants the necessary permissions for your application. Partial trust applications running within a host are considered transparent applications (see following) and have various restrictions on them.

Return a generic enumerator. public IEnumerator<string> BlackAndWhite() { yield return "black"; yield return "gray"; yield return "white"; }

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NOTE Full trust applications such as ASP.NET application can still call critical code, so they are not considered transparent.

While the ContentControl classes can have only a single item of content, the ItemsControl classes can have any number of content items. The content items are kept in an ordered collection, referenced by the Items property. The content items can be of the same or different types.

The following method declaration is another version that produces the same result: Return a generic enumerator. public IEnumerator<string> BlackAndWhite() { string[] theColors = { "black", "gray", "white" }; for (int i = 0; i < theColors.Length; i++) yield return theColors[i]; } I haven t explained the yield return statement yet, but on inspecting these code segments, you might have the feeling that something is different about this code. It doesn t seem quite right. What exactly does the yield return statement do For example, in the first version, if the method returns on the first yield return statement, then the last two statements can never be reached. If it doesn t return on the first statement but continues through to the end of the method, then what happens to the values And in the second version, if the yield return statement in the body of the loop returns on the first iteration, then the loop will never get to any subsequent iterations. And besides all that, an enumerator doesn t just return all the elements in one shot it returns a new value with each access of the Current property. So, how does this give you an enumerator Clearly this code is different from anything shown before.

Runtime support has been removed for enforcing Deny, RequestMinimum, RequestOptional, and RequestRefuse permission requests. Note that when you upgrade your applications to use .NET 4.0, you might receive warnings and errors if your application utilizes these methods. As a last resort, you can force the runtime to use legacy CAS policy with the new NetFx40_ LegacySecurityPolicy attribute. For migration options, see http://msdn.microsoft.com/ en-us/library/ee191568(VS.100).aspx.

An iterator block is a code block with one or more yield statements. Any of the following three types of code blocks can be iterator blocks: A method body An accessor body An operator body

You can associate items with an element derived from ItemsControl in several ways. You can place the items in the element s Items collection, or you can bind the items from a data source to the ItemsSource property. Since I ll cover data binding in 8, I ll postpone the explanation of how to use the ItemsSource property until then. Figure 6-19 shows the abridged derivation tree of the ItemsControl class.

CAUTION If you are considering using the NetFx40_LegacySecurityPolicy, Shawn Farkas on the Microsoft Security team warned me that

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