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Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-69

milliseconds. The null argument represents a state object that's passed into the callback method; we don't use this feature in the example. As soon as the timer is created, it will begin waiting for the initial delay to elapse. We keep an instance reference to the timer in the class that created it because the timer will continue to signal the delegate until it is disposed of. If we do not have a reference, we cannot make that call. A timer is terminated by calling the Dispose method. Another reason that we kept a reference to the Timer instance is that it's possible to change the details of the timer after it has been created, in effect restarting the timer. This can be done with the Change method, which takes two long arguments. The first argument specifies how many milliseconds should pass before the delegate is signaled again, and the second argument specifies how many milliseconds should elapse between subsequent signals. The output from this example will be something similar to the following:

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Lesson Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-70

At this point, we have discussed the relationship between source code, IL, and JITted code . We have also discussed the thread s stack, arguments, local variables, and how these arguments and variables refer to objects on the managed heap . You also see how objects contain a pointer to their type object (containing the static fields and method table) . We have also discussed how the JIT compiler determines how to call static methods, nonvirtual instance methods, and virtual instance methods . All of this should give you great insight into how the

Lesson 3: Troubleshooting Network Protocol Security . . . . . . . . . . . . . . . . . . 11-71

CLR works, and this insight should help you when architecting and implementing your types, components, and applications . Before ending this chapter, I d like to give you just a little more insight as to what is going on inside the CLR . You ll notice that the Employee and Manager type objects both contain type object pointer members . This is because type objects are actually objects themselves . When the CLR creates type objects, the CLR must initialize these members . To what you might ask . Well, when the CLR starts running in a process, it immediately creates a special type object for the System.Type type (defined in MSCorLib .dll) . The Employee and Manager type objects are instances of this type, and therefore, their type object pointer members are initialized to refer to the System.Type type object, as shown in Figure 4-13 . Of course, the System.Type type object is an object itself and therefore also has a type object pointer member in it, and it is logical to ask what this member refers to . It refers to itself because the System.Type type object is itself an instance of a type object . And now you should understand the CLR s complete type system and how it works . By the way, System.Object s GetType method simply returns the address stored in the specified object s type object pointer member . In other words, the GetType method returns a pointer to an object s type object, and this is how you can determine the true type of any object in the system (including type objects) .

Problem 1: Making Your IPSec Policy Work . . . . . . . . . . . . . . . . . . . . . . . 11-72

Timer Timer Timer Timer Called: Called: Called: Called: 14:23:10 14:23:12 14:23:14 14:23:16

Thread Stack Heap Manager Object e (Employee) year (int32) = 5 Type object ptr Sync block index Instance fields Manager Object Type object ptr Sync block index Instance fields

authoritative server reported that the queried name does not exist in the DNS namespace. authoritative server reported that the queried name exists but no records of the specified type exist for that name.