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In these data access methods, the call into the database is always wrapped with a try...catch block. I have two main reasons for including this extra layer of protection. First, I want to be able to handle the problem within the data access layer, where I know how to handle the problem. Second, I want to trap in the data access layer any exception that may expose information about the database to a user. Doing so will head off problems that could lead to a security hole. However, the addition of the try...catch block can reduce performance. This choice was made with that fact in mind. The performance penalty should be minimal. To avoid the performance hit of entering this try...catch block, I can still use caching. If the data to be requested by the database query is already in the cache, the call to the database can be avoided along with the exception handling. And if you choose to lose the try...catch block completely, you can strip it off and just leave the using clause for resource management of the DbCommand. You may find that the trade-off for performance is not significant enough to give up the stability and security that the close exception handling offers.

BeforeInvoke advice 2 AfterInvoke AfterInvoke Expression.Assign(returnValue, originalExpression)

When you work with your application, you will want to pass around objects that make sense to your business A business object such as a Customer has properties such as FirstName, LastName, CurrentOrder, and LastOrder This business object fully implements the three parts of an object: data, behavior, and relationships A Customer has a first and last name and a relationship to his current and last order A Customer can also complete his CurrentOrder These are all processes that an application owner understands and conveys to the development team through carefully designed business objects Instead of having disjointed blobs of data held in a DataSet that directly mirrors the structure of your relational database, you have the opportunity to truly represent the real-world objects for the application.

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For the purpose of this chapter, the AOP framework implementation at this point is finished. Obviously, there are many things the framework does not support. The AopMetaObject class only overrides the BindGetMember method. A more complete implementation will override other Bind[Operation] methods and weave in the advice logic in those overridden methods. The AOP framework supports the order of advisor objects. Spring.NET provides a way for specifying the order of advice objects and our AOP framework does not account for that. Nonetheless, the AOP framework lays the groundwork for further enhancements. It also demonstrates one important scenario (i.e., the AOP programming paradigm) in which the DLR dynamic object infrastructure can be leveraged. To celebrate, let s take a break and have some fun with the AOP framework.

In this section, you will harvest the results of the AOP framework built in the previous sections. To use the AOP framework, I wrote a method called RunAopExample and put it in Program.cs. Listing 7-13 shows its code. Listing 7-13. An Example in Program.cs That Uses the AOP Framework 1) private static void RunAopExample() 2) { 3) dynamic customer = new Customer("John", 5); 4) Console.WriteLine("Customer {0} is {1} years old.\n", 5) customer.Name, customer.Age); 6) 7) IEmployee employee = (IEmployee)context["employeeBob"]; 8) Console.WriteLine("Employee {0} is {1} years old.", 9) employee.Name, employee.Age); 10) } The RunAopExample method creates a Customer instance in line 3 and fetches an IEmployee instance from the Spring.NET application context in line 7. Method calls to those two instances property getters will be intercepted, matched against the pointcuts specified in application-config.xml, and then advised as appropriate. You ll see the following output when you run the example: Customer Name getter is called. Advice BeforeInvoke is called. Intercepted method is get Age. Customer Age getter is called. Advice AfterInvoke is called. Intercepted method is get Age. Customer John is 5 years old. Employee Name getter is called. Advice BeforeInvoke is called. Intercepted method is get Age.

In addition to properly representing the real-world objects, you can also fully encapsulate the data access layer behind these business objects, which gives you the opportunity to use techniques such as lazy loading to boost performance while maintaining a consistent public interface The central business object of the Favorite Links website is the FavoriteLink object As a business object, it holds onto the various properties of a link such as the Title, Url, Rating, Note, and Tags Each of these properties is populated by columns returned from calls to stored procedures Mapping these values can be a considerable amount of work, especially in the early stages of your application, when you are still adjusting the columns and properties Updating the mappings can be time-consuming.

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