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Requiring this cast isn t obvious at all, and many developers won t figure this out on their own . But an even more troublesome problem exists: casting the Int32 value type to an IConvertible also boxes the value type, wasting memory and hurting performance . This is the second of the big problems I mentioned at the beginning of this section . The third and perhaps the biggest problem with EIMIs is that they cannot be called by a derived class . Here is an example:

Effect on Modified Member Indicates that the implementation of a member is external to the C# code. This usually means that the implementation is contained in a pre-.NET Microsoft Windows dynamic-link library (DLL).

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internal class Base : IComparable { // Explicit Interface Method Implementation Int32 IComparable.CompareTo(Object o) { Console.WriteLine("Base's CompareTo"); return 0; } } internal sealed class Derived : Base, IComparable { // A public method that is also the interface implementation public Int32 CompareTo(Object o) { Console.WriteLine("Derived's CompareTo"); // This attempt to call the base class's EIMI causes a compiler error: // error CS0117: 'Base' does not contain a definition for 'CompareTo' base.CompareTo(o); return 0; } }

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Welcome to MCSA/MCSE Self-Paced Training Kit (Exam 70-291): Implementing, Managing, and Maintaining a Microsoft Windows Server 2003 Network Infrastructure. This book prepares you for the 70-291 exam by teaching you how to configure, manage, and troubleshoot various aspects of a Microsoft Windows Server 2003 network infra structure. Each chapter walks you through the hands-on deployment and management of these various aspects, including the network addressing, name resolution, routing, remote access, and security. After you read this book, answer the associated questions, and perform all of the exercises included, you will have gained a thorough understand ing of the essential components supporting Windows Server 2003 networks.

If the external implementation is contained in a Windows DLL, members must be static and decorated with the DLLImport attribute. See "Attributes" in 6 for details. The extern modifier is mutually exclusive with abstract. The body of a member modified with extern must always be an empty statement.

In Derived s CompareTo method, I try to call base.CompareTo, but this causes the C# compiler to issue an error . The problem is that the Base class doesn t offer a public or protected CompareTo method that can be called; it offers a CompareTo method that can be called only

For more information about becoming a Microsoft Certified Professional (MCM), see the section entitled The Microsoft Certified Professional Program later in this introduction.

This book was developed for information technology (IT) professionals who plan to take the related Microsoft Certified Professional exam 70-291, as well as IT profession als who implement, administer, and support Windows Server 2003 networks.

by using a variable that is of the IComparable type . I could modify Derived s CompareTo method so that it looks like this:

readonly Identifies a field as being read-only. Read-only fields are more flexible than constants because they can be initialized at declaration or within an instance constructor. Static read-only fields can be initialized at declaration or within a static constructor. The ref and out parameter modifiers can be used only on readonly fields within the context of an instance constructor. The modified member exists within the context of the type in which it's declared, independently of a specific class or struct instance. Significantly, C# static members cannot be referenced through an instance of the type, only through a reference to the containing type.

Note Exam skills are subject to change without prior notice and at the sole discretion of Microsoft.

// A public method that is also the interface implementation public Int32 CompareTo(Object o) { Console.WriteLine("Derived's CompareTo"); // This attempt to call the base class's EIMI causes infinite recursion IComparable c = this; c.CompareTo(o); return 0; }

This training kit requires that students meet the following prerequisites:

In this version, I am casting this to an IComparable variable, c . And then, I use c to call CompareTo . However, the Derived s public CompareTo method serves as the implementation for Derived s IComparableCompareTo method, and therefore, infinite recursion occurs . This could be fixed by declaring the Derived class without the IComparable interface, like this:

18 months professional experience working with Windows networks Familiarity with networking concepts equivalent to that of a CompTIA Network+ certification

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