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invoked by an entirely different method in an entirely different object. Compiling and running the code in Listing 10-23 produces the following result: Result 0 = 0 Result 1 = 1 Result 2 = 4 Result 3 = 9 Result 4 = 16 calculationCount: 5 Press enter to finish Variables that are accessed outside the anonymous method are called captured variables. The calculationCount variable in Listing 10-23 was captured by the anonymous method. An anonymous method that captures variables is called a closure. Captured variables are evaluated when the delegate is invoked, which means that you should take care when making assumptions about the value of a variable. Listing 10-24 provides a demonstration. Listing 10-24. Evaluating Captured Variables using System; class Listing 24 { static void Main(string[] args) { // define a variable that will be captured string message = "Hello World"; // define an anonymous method that will capture // the local variables Action printMessage = delegate() { Console.WriteLine("Message: {0}", message); }; // modify one of the local vaiables message = "Howdy!"; // invoke the delegate printMessage(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } When the anonymous method is defined, the value of the message variable is Hello World. But defining an anonymous method doesn t capture the variables it references that doesn t happen until

First, it s important to recognize that the key classes in the framework are those that business developers will use as they create business objects, but that these are a small subset of what s available. In fact, many of the framework classes are never used directly by business developers. Figure 2-10 shows only those classes the business developer will typically use.

The two steps can be combined by initializing the variable with the object-creation expression. Declare variable. Dealer theDealer = new Dealer(); // Declare and initialize. Initialize with an object-creation expression. In the case of local variables, but not fields, you can simplify the syntax a bit more by having the compiler infer the type in the declaration part on the left. But I ll cover that in the section on local variables in the next chapter.

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It s very easy to reach erroneous conclusions based on previous experience. Let me give you an example. Working a lot with Oracle Real Application Clusters (RAC), I learned pretty much all the common symptoms and causes for node evictions in an Oracle RAC cluster. I knew there are a few components that cause node eviction, and I could always quickly determine by running Oracle 10g Release 2 on Linux (let s be specific) that it s one of three Clusterware components that can evict a node: the CSSD daemon, the OCLSOMON daemon, and the hangcheck-timer module (which is actually part of the Linux operating system).

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