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This section will start by looking at the first in the preceding list: the non-generic interface form. This form of enumerator is a class that implements the IEnumerator interface. It is called non-generic because it does not use C# generics. The IEnumerator interface contains three function members: Current, MoveNext, and Reset. Current is a property that returns the item at the current position in the sequence. It is a read-only property. It returns a reference of type object, so an object of any type can be returned. MoveNext is a method that advances the enumerator s position to the next item in the collection. It also returns a Boolean value, indicating whether the new position is a valid position or is beyond the end of the sequence. If the new position is valid, the method returns true. If the new position is not valid (i.e., it s at the end), the method returns false. The initial position of the enumerator is before the first item in the sequence. MoveNext must be called before the first access of Current, or the CLR will raise an InvalidOperationException exception. Reset is a method that resets the position to the initial state. Figure 20-2 illustrates a collection of three items, which is shown on the left of the figure, and its enumerator, which is shown on the right. In the figure, the enumerator is an instance of a class called ArrEnumerator.

1CF1 = SubjectType/Subject.attach 1CI = .action 1CF2 = .notification 1CF3 = .detach Mediator: To manage the interactions of objects, allowing them to be more generic +: 1COIi = 1COF1(Ii)+lO(1COI0) ^ x = 1CF2(OI0)+lCFf (1COIf)

In the previous section, you saw that you can use the cast operator to get a reference to an object s interface. An even better idea is to use the as operator. The as operator will be covered in detail in 18, but I ll mention it here as well, since it s a good choice to use with interfaces. If you attempt to cast a class object reference to a reference of an interface that it doesn t implement, the cast operation will raise an exception. You can avoid this problem by using the as operator instead. It works as follows: If the class implements the interface, the expression returns a reference to the interface. If the class does not implement the interface, the expression returns null rather than raising an exception. The following code demonstrates the use of the as operator. The first line uses the as operator to obtain an interface reference from a class object. The result of the expression sets the value of b either to null or to a reference to an ILiveBirth interface. The second line checks the value of b, and if it is not null, executes the command that calls the interface member method. Class object ref Interface name ILiveBirth b = a as ILiveBirth; // Acts like cast: (ILiveBirth)a Interface Operator ref if (b != null) Console.WriteLine("Baby is called: {0}", b.BabyCalled());

By now, the hard part is over. Listing 6-12 shows how to identify where to insert the signature and connect back to the previously used body ID. The last sig.sign() call is what does the signing.

In the examples shown so far, the classes have implemented a single interface. A class or struct can implement any number of interfaces. All the interfaces implemented must be listed in the base class list and separated by commas (following the base class name, if there is one). For example, the following code shows class MyData, which implements two interfaces: IDataStore and IDataRetrieve. Figure 17-4 illustrates the implementation of the multiple interfaces in class MyData. interface IDataRetrieve { int GetData(); interface IDataStore { void SetData( int Interface Interface class MyData: IDataRetrieve, IDataStore { int Mem1; public int GetData() { return public void SetData( int x ) { Mem1 = } } x ); } // Declare interface // Declare interface

1CF1 = MediatorType/Mediator.newColleagues 1CF2 = .colleagueFunction Bridge: To make a logical parent-children relationship allow each to change independently +: Factory(lS=2C) ^ x = 1CFf (If)+1PFg(1CIg)+2CFh(1Ih)

private static void signTree(Node root, PrivateKey privateKey, XMLSignature sig) throws MarshalException, XMLSignatureException { Element envelope = getFirstChildElement(root); Element header = getFirstChildElement(envelope); DOMSignContext sigContext = new DOMSignContext(privateKey, header); sigContext.putNamespacePrefix(XMLSignature.XMLNS, "ds"); sigContext.setIdAttributeNS(getNextSiblingElement(header), "http://schemas.xmlsoap.org/soap/security/2000-12","id"); sig.sign(sigContext); }

// Declare class // Declare field Mem1; } x; }

class Program { static void Main() // Main { MyData data = new MyData(); data.SetData( 5 ); Console.WriteLine("Value = {0}", data.GetData()); } } This code produces the following output:

Similar to signing, validation (see Listing 6-13) isn t that complicated once you have the necessary pieces. Again, this requires you to find the signature element before locating the body element to validate. Finally, the validate() method of XMLSignature is called to see if the tree passes.

1C = Abstraction/RefinedAbstraction 2C = ImplementationType/Implementation Composite: To treat individual objects and compositions of them in the same way +: I = 1C2OF(1C1OI0) ^ x = 1C1OFf (I f) x = 1C2OFf (I f)