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public IEnumerator<string> GetEnumerator() // GetEnumerator { return ColorFlag Colors // Return Colors enumerator : BlackAndWhite; // Return BlackAndWhite enumerator } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return ColorFlag Colors // Return Colors enumerator : BlackAndWhite; // Return BlackAndWhite enumerator } } class Program { static void Main() { MyClass mc1 = new MyClass( true ); foreach (string s in mc1) Console.Write("{0} ", s); Console.WriteLine(); MyClass mc2 = new MyClass( false ); foreach (string s in mc2) Console.Write("{0} ", s); Console.WriteLine(); } } This code produces the following output: blue red yellow black gray white

Addition and subtraction operators are now supported for System.IntPtr and System.UIntPtr. Add()() and Subtract() methods have also been added to these types.

Whenever the selected item in the ListBox changes, the ListBox s SelectionChanged event is raised. If you create an event handler in the code-behind, you can assign the name of the event handler to the event, and when the event is raised, the event handler is called. The markup and code-behind shown below create a window that shows a ListBox with the names of three dogs, as shown on the left in Figure 6-22. When the user selects one of the items in the ListBox, the event handler produces a dialog box showing the item selected, as shown on the right in Figure 6-22.

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The following are some other important things to know about iterators: Iterators require the System.Collections.Generic namespace, so you should include it with a using directive. In the compiler-generated enumerators, the Reset method is not supported. It is implemented, since it is required by the interface, but the implementation throws a System.NotSupportedException exception if it is called. Notice that the Reset method is shown grayed out in Figure 20-9.

The CLR contains support for tail recursion, although this is only currently accessible through F#.

Behind the scenes, the enumerator class generated by the compiler is a state machine with four states: Before: The initial state before the first call to MoveNext. Running: The state entered when MoveNext is called. While in this state, the enumerator determines and sets the position for the next item. It exits the state when it encounters a yield return, a yield break, or the end of the iterator body. Suspended: The state where the state machine is waiting for the next call to MoveNext. After: The state where there are no more items to enumerate. If the state machine is in either the before or suspended states and there is a call to the MoveNext method, it goes into the running state. In the running state, it determines the next item in the collection and sets the position. If there are more items, the state machine goes into the suspended state. If there are no more items, it goes into the after state, where it remains. Figure 20-12 shows the state machine.

Action and Func delegates now can accept up to 16 generic parameters, which might result in unreadable code. This reminds me of an API that a health care provider (who shall remain nameless) gave me that had a method with more than 70 ( !) parameters.

Figure 6-22. A ListBox with three items. When the item selected changes, a dialog box shows the new selection. The following is the markup and code-behind of the window shown in Figure 6-22. <StackPanel> <ListBox Name="lstbxDogs" HorizontalAlignment="Left" Width="100" SelectionChanged="lstbxDogs_SelectionChanged" >

What Is LINQ LINQ Providers Query Syntax and Method Syntax Query Variables The Structure of Query Expressions The Standard Query Operators LINQ to XML

The 4 GB size limit has been removed from System.IO.Compression methods. The compression methods in DeflateStream and GZipStream do not try to compress already compressed data, resulting in better performance and compression ratios.

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