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Member Description Properties Returns the number of items in the collection. Count IsSynchronized Returns true if this instance is thread-safe. Returns an object that can be used to provide synchronized access to the SyncRoot collection. Methods Copies all of the elements in the collection into an array. Throws an exception CopyTo() if more elements are in the collection than can be held in the array or if the elements cannot be implicitly cast to the array type. The equivalent Java interface is java.util.Collection, containing 15 methods that provide commonality across all collection classes. .NET takes the approach of pushing method definitions down into specialized interfaces for lists and dictionaries.

5. Set the IPsecloginterval value to 60 seconds:

You do have to use the GCHandle type explicitly when you need to pass the address of a managed object to unmanaged code and then, the unmanaged function returns, but unmanaged code might still need to use the object later The most common example of this is when performing asynchronous I/O operations Let s say that you allocate a byte array that should be filled as data comes in from a socket Then, you would call GCHandle s Alloc method, passing in a reference to the array object and the Pinned flag Then, using the returned GCHandle instance, you call the AddrOfPinnedObject method This returns an IntPtr that is the actual address of the pinned object in the managed heap; you d then pass this address into the unmanaged function, which will return back to managed code immediately .

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6. Display information about Main Mode and Quick Mode SAs using the Show Mmsas All (Figure 11-36) and Show Qmsas All (Figure 11-37) commands.

The IEnumerable interface is very simple but useful. It contains only one method:

While the data is coming from the socket, this byte array buffer should not move in memory; preventing this buffer from moving is accomplished by using the Pinned flag When the asynchronous I/O operation has completed, you d call GCHandle s Free method, which will allow a future garbage collection to move the buffer Your managed code should still have a reference to the buffer so that you can access the data, and this reference will prevent a garbage collection from freeing the buffer from memory completely ..

Figure 11-36

21

Monitoring Network Protocol Security 11-65

IEnumerator.GetEnumerator();

In this exercise, you monitor IPSec activity using the IP Security Monitor snap-in. 1. Open IP Security Monitor on both computers by adding the snap-in to an MMC. 2. Check that the active IPSec policy is the one you assigned. 3. Examine the details about the active policy. Are the details what you expected

Automatic Memory Management (Garbage Collection)

4. Select the Main Mode (Figure 11-38) and Quick Mode (Figure 11-39) Security Associations nodes and double-click the SA in the details pane. This step tells you which encryption is being used.

It is also worth mentioning that C# offers a fixed statement that effectively pins an object over a block of code . Here is some code that demonstrates its use:

11-66

Classes that implement this method must return a class that implements the IEnumerator interface. The IEnumerator interface defines the notion of a cursor that moves over the elements of a collection. It has three members, as described in Table 9-2, for moving the cursor and retrieving elements from the collection.

unsafe public static void Go() { // Allocate a bunch of objects that immediately become garbage for (Int32 x = 0; x < 10000; x++) new Object(); IntPtr originalMemoryAddress; Byte[] bytes = new Byte[1000];

11

// Get the address in memory of the Byte[] fixed (Byte* pbytes = bytes) { originalMemoryAddress = (IntPtr) pbytes; } // Force a collection; the garbage objects will go away & the Byte[] might be compacted GC.Collect(); // Get the address in memory of the Byte[] now & compare it to the first address fixed (Byte* pbytes = bytes) { Console.WriteLine("The Byte[] did{0} move during the GC", (originalMemoryAddress == (IntPtr) pbytes) " not" : null); } }

Figure 11-38

Member Comments Properties The Current property returns the element at the position of the cursor. The type Current that is returned is determined by the implementation, but the return type is defined as object. Methods

Figure 11-39

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