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In this code, DerivedType and its DoSomething method are both considered Tasty because the TastyAttribute class is marked as inherited . However, DerivedType is not serializable because the FCL s SerializableAttribute class is marked as a noninherited attribute . Be aware that the .NET Framework considers targets only of classes, methods, properties, events, fields, method return values, and parameters to be inheritable . So when you re defining an attribute type, you should set Inherited to true only if your targets include any of these targets . Note that inherited attributes do not cause additional metadata to be emitted for the derived types into the managed module . I ll say more about this a little later in the Detecting the Use of a Custom Attribute section . Note If you define your own attribute class and forget to apply an AttributeUsage attribute

MS-CHAP v2 (VPN only for Windows 95)

10-12

to your class, the compiler and the CLR will assume that your attribute can be applied to all targets, can be applied only once to a single target, and is inherited . These assumptions mimic the default field values in the AttributeUsageAttribute class .

throw new ExceptionClass();

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When defining your own custom attribute class, you can define its constructor to take parameters that must be specified by developers when they apply an instance of your attribute type . In addition, you can define nonstatic public fields and properties in your type that identify settings that a developer can optionally choose for an instance of your attribute class . When defining an attribute class s instance constructor, fields, and properties, you must restrict yourself to a small subset of data types . Specifically, the legal set of data types is limited to the following: Boolean, Char, Byte, SByte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, String, Type, Object, or an enumerated type . In addition, you can use a single-dimensional, zero-based array of any of these types . However, you should avoid using arrays because a custom attribute class whose constructor takes an array is not CLS-compliant . When applying an attribute, you must pass a compile-time constant expression that matches the type defined by the attribute class . Wherever the attribute class defines a Type parameter, Type field, or Type property, you must use C# s typeof operator, as shown in the following code . Wherever the attribute class defines an Object parameter, Object field, or Object property, you can pass an Int32, String, or any other constant expression (including null) . If the constant expression represents a value type, the value type will be boxed at runtime when an instance of the attribute is constructed . Here s an example of an attribute and its usage:

Table 10-1

using System; internal enum Color { Red } [AttributeUsage(AttributeTargets.All)] internal sealed class SomeAttribute : Attribute { public SomeAttribute(String name, Object o, Type[] types) { // 'name' refers to a String // 'o' refers to one of the legal types (boxing if necessary) // 'types' refers to a 1-dimension, 0-based array of Types } } [Some("Jeff", Color.Red, new Type[] { typeof(Math), typeof(Console) })] internal sealed class SomeType { }

Requirement Encrypted authentication support for remote access clients that use other operating systems Encrypted authentication support for remote access clients running Shiva LAN Rover software Unencrypted authentication when the remote access clients support no other protocol Authentication credentials not supplied by the remote access client

C# introduces a shorthand syntax for rethrowing caught exceptions: the throw statement with no parameters. This is required when using the new catch syntax described in the preceding section. For example:

Exam Tip Expect to see more than one exam question in which you need to know the fea tures and limitations of various authentication protocols. At a minimum, you should be able to answer the following:

Logically, when a compiler detects a custom attribute applied to a target, the compiler constructs an instance of the attribute class by calling its constructor, passing it any specified parameters . Then the compiler initializes any public fields and properties using the values specified via the enhanced constructor syntax . Now that the custom attribute object is initialized, the compiler serializes the attribute object s state out to the target s metadata table entry .

Which protocol is required for smart cards Which protocol requires the use of certificates What are the special configuration requirements for CHAP When is MS-CHAP v1 the best choice for authentication method When is MS-CHAP v2 the best choice for authentication method What is the difference between authentication encryption and data encryption Which protocols support data encryption Which protocol does not encrypt authentication data Which protocols support mutual authentication Which protocol must be used in conjunction with Active Directory directory service

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