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Dynamic mode can be quite useful, for example, if you need to immediately initiate a change to IPSec processing. Although some IPSec commands require you to stop and start the IPSec service, others do not. However, Dynamic mode can also be a mixed blessing. Should you make a mistake in Dynamic mode, you will have no opportunity to discover it before imple menting the change. You could end up creating an incorrect configuration without warning.

For complex business rules, a rule engine is often used to handle rule evaluation. Using a rule engine separates the rule evaluation concern from the core business logic. However, all core modules that need business rule support still have to embed code to populate the engine with business objects and invoke the rule evaluation. In this section, we examine a solution that allows the core modules to be completely oblivious to the business rule implementation; they no longer have to embed any business rule code. This creates an isolation layer between the rule engine and the business logic, allowing independent evolution of the two. At a high level, the rule engine based solution is similar to our earlier solution in section 12.5, except that here we employ a rule engine to carry out the rule evaluation.

To begin sharing programs or your desktop, click the Share button on the command bar or the link in the center of the screen. The first time you do this, you ll see an elaborate confirmation prompt, but you can select a check box to suppress this on future occasions:

The .size function allows you to determine the number of elements in the result set. This code returns the number of found items and sets the value to a variable.

Like operator overload methods, conversion operator methods must also be public and static. For conversion operator methods, you must also indicate whether a compiler can emit code to call a conversion operator method implicitly or whether the source code must explicitly indicate when the compiler is to emit code to call a conversion operator method. In C#, you use the implicit keyword to indicate to the compiler that an explicit cast doesn t have to appear in the source code in order to emit code that calls the method. The explicit keyword allows the compiler to call the method only when an explicit cast exists in the source code. After the implicit or explicit keyword, you tell the compiler that the method is a conversion operator by specifying the operator keyword. After the operator keyword, you specify the type that an object is being cast to; in the parentheses, you specify the type that an object is being cast from. Defining the conversion operators in the preceding Rational type allows you to write code like this (in C#):

In the New Project dialog box, select Silverlight as the project type and Silverlight Application as the template. Name the project Ch7_NavAppFromScratch, as shown in Figure 7-2.

Note that here you wrap the actual query in a CDATA block to ensure that the XML parser skips the query text. This is necessary since some symbols, such as < and >, can cause XML parsing errors. There is no limitation on the number of query elements you can have in a mapping file; just be sure that all of the query names are unique. You may name the queries anything you would like, although we have found that prefixing the name of the persistent class is helpful. Accessing named queries is simple: