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In C#, you apply a custom attribute to a target by placing the attribute in square brackets immediately before the target So, in this case, the StructLayout attribute is applied to the OSVERSIONINFO class, the MarshalAs attribute is applied to the CSDVersion field, the DllImport attribute is applied to the GetVersionEx method, and the In and Out attributes are applied to GetVersionEx s ver parameter Every programming language defines the syntax that a developer must use in order to apply a custom attribute to a target Microsoft Visual Basic, for example, requires angle brackets (<, >) instead of square brackets The CLR allows attributes to be applied to just about anything that can be represented in a file s metadata Most commonly, attributes are applied to entries in the following definition tables: TypeDef (class, struct, enum, interfaces, and delegates), MethodDef (including constructors), ParamDef, FieldDef, PropertyDef, EventDef, AssemblyDef, and ModuleDef.

The Visual Studio tools for Silverlight do not automatically add a reference to the support library that enables dynamic to work. So when you first add a dynamic variable to a Silverlight application, you ll get a compiler error. You need to add a reference to the Microsoft.CSharp library in your Silverlight project. This applies only to Silverlight projects other C# projects automatically have a reference to this library.

In this example, we are registering a reference to the MyEJB2 under the ejb/reference ToMyEJB2 name. Business logic running inside the MyEJBBean is able to do JNDI lookups to find this reference. Each environment annotation, such as @javax.annotation.EJB, has a name() attribute that specifies the JNDI ENC name to which you want the service reference to be bound. The second half of this chapter describes all the details of each of these different environment annotations.

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Although it s rare, attributes can also be applied to entries in reference tables, such as AssemblyRef, ModuleRef, TypeRef, and MemberRef Finally, custom attributes can be applied to other pieces of metadata such as security permissions, exported types, and resources Although the CLR allows custom attributes to be applied to any of these entities, most programming languages allow attributes to be applied only to entries in the various definition metadata tables This is certainly true of Microsoft s C# compiler Specifically, C# allows you to apply an attribute only to source code that defines any of the following targets: assembly, module, type, field, method, method parameter, method return value, property, and event When you re applying an attribute, C# allows you to specify a prefix specifically indicating what target the attribute applies to The following code shows all the possible prefixes.

To explicitly implement a particular member of an interface, you drop the accessibility modifier and add the interface name as a prefix, as shown in Example 4-24.

Compare two instances for equality . Obtain a hash code for the instance . Query the true type of an instance . Perform a shallow (bitwise) copy of the instance . Obtain a string representation of the instance object s current state .

In many cases, if you leave out the prefix, the compiler can still determine what target an attribute applies to, as shown in the previous example However, explicitly specifying a prefix removes all ambiguity..

Table 3.5 Ant s built-in FilterReaders Description Generates name=value" lines for basic and String datatype constants found in a class file. Replaces Ant property values. (See section 3.12 for property discussion.) Extracts the first specified number of lines. Only lines containing the specified string are passed through. All lines have a prefix prepended. Performs token substitution, just as filtersets do. Removes Java style comments. Removes line breaks, defaulting to \r" and \n" but characters stripped can be specified. Removes lines beginning with a specified set of characters. Replaces tabs with a specified number of spaces. Extracts the last specified number of lines. FilterReader <classconstants>. <expandproperties> <headfilter> <linecontains> <prefixlines> <replacetokens> <stripjavacomments> <striplinebreaks> <striplinecomments> <tabstospaces> <tailfilter>

The JAXM API consists of two packages, as summarized in table 2.9. Your components access JAXM services via a ConnectionFactory and Connection interface, in the same way you would obtain a handle to a message queue in the Java Messaging Service (JMS) architecture. After obtaining a Connection, you can use it create a structured SOAP message and send it to a remote host via HTTP(S). JAXM also provides a base Java servlet for you to extend when you need to handle inbound SOAP messages.

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INSERT INTO LineItems (OrderID, CustomerID, ProductID, Quantity) VALUES (10002, 'BW3', 'BEV01COF', 1)

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