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There are five components of code that need to be in place to use events. I will cover each of them in the following sections, and they are illustrated in Figure 16-4. These components are the following: Delegate type declaration: The event and the event handlers must have a common signature and return type, which is described by the delegate type declaration. Event handler declarations: These are the declarations in the subscriber classes of the methods (event handlers) to be executed when the event is raised. These do not have to be separate methods. They can be anonymous methods or lambda expressions. Event declaration: This is the declaration in the publisher class of the event that holds and invokes the event handlers. Event registration: This is the code that connects the event handlers to the event. Code that raises the event: This is the code in the publisher that calls the event, causing it to invoke its event handlers.

This is convenient for the built-in types, but it doesn t work for classes or structs because the sort routine doesn t know how to order them.

Figure 7-10. Our feature.xml file after inserting the Code Snippet Figure 7-10 loses a little bit of its usefulness when it gets printed in black and white, but take a look at your screen. The parts highlighted in green are the ones we re interested in. These are the pieces we need to customize for our particular workflow. Table 7-8 provides details on the changes we need to make to each of these entries in our feature.xml file.

No matter where tempdb is located, it should be located on the fastest I/O subsystem available to your SQL Server instance. Your hardware will limit what you can do, but you might want to consider the following options, assuming your hardware (and budget) permits:

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Now you know how to write more compact IL code and how to use managed exception handling to protect it from crashes. Managed exception handling is important in .NET programming because the managed methods of the .NET Framework class library (and even separate IL instructions) routinely throw exceptions instead of returning error codes. In the next chapter, I will show you how to make IL programming a little less boring.

The previous examples used iterators that returned either an IEnumerator<T> or an IEnumerable<T>. You can also create iterators that return the non-generic versions as well. The return types you can specify are the following: IEnumerator<T> (generic substitute an actual type for T) IEnumerable<T> (generic substitute an actual type for T) IEnumerator (non-generic) IEnumerable (non-generic) For the two enumerator types, the compiler generates a nested class that contains the implementation of either the non-generic or the generic enumerator, with the behavior specified by the iterator block. For the two enumerable types, it does even more. It produces a nested class that is both enumerable and the enumerator. The class, therefore, implements both the enumerator and the GetEnumerator method. Notice that GetEnumerator is implemented as part of the nested class not as part of the enclosing class. Figure 20-10 illustrates the generic enumerable produced by the enumerable iterator in the last example. The iterator s code is shown on the left side of the figure, and shows that its return type is IEnumerable<string>. On the right side of the figure, the diagram shows that the nested class implements both IEnumerator<string> and IEnumerable<string>.

When you retrieve a Bid from the database, the association property may hold an instance of an NHibernate generated subclass of Item that delegates all method invocations to a different instance of Item that is fetched lazily from the database (this is the more elaborate definition of an NHibernate proxy). In order to delegate method (and property) invocations, these members need to be virtual. NHibernate 1.2 uses a validator that verifies that proxied entities have a default constructor which isn t private, that they aren t sealed, that all public methods and properties are virtual, and that there is no public field. It s possible to turn off this validator; but you should carefully think about why you do that. Here is the element to add to your configuration file to turn it off:

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