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Notice how we pulled out the code to check for null and execute the delegate into functions called OnXXX. This isn t strictly necessary, but it is a very common practice.

0.0.0.0/0

If we are designing our class as a base, we often mark this kind of method as a protected virtual so that derived classes can override the eventraising function instead of subscribing to the event. This can be more efficient than going through the event, and it allows us (optionally) to decline to raise the event by not calling on the base implementation. Be careful to document whether derived classes are allowed not to call the base, though!

Now we need to subscribe to those events. So let s create a couple of classes to simulate what the production department would need to do (see Example 5-22).

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Chain FORWARD (policy ACCEPT) target prot opt source RH Firewall 1 INPUT all 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source Chain RH Firewall 1 INPUT (2 references) target prot opt source ACCEPT all 0.0.0.0/0 ACCEPT icmp 0.0.0.0/0 ACCEPT esp 0.0.0.0/0 ACCEPT ah 0.0.0.0/0 ACCEPT udp 0.0.0.0/0 ACCEPT udp 0.0.0.0/0 ACCEPT tcp 0.0.0.0/0 ACCEPT all 0.0.0.0/0 ACCEPT tcp 0.0.0.0/0 REJECT all 0.0.0.0/0 icmp host prohibited

class ProductionDeptTool1 { public void Subscribe ( DocumentProcessor processor ) { processor.Processing += processor_Processing; processor.Processed += processor_Processed; } public void Unsubscribe(DocumentProcessor processor) { processor.Processing -= processor_Processing; processor.Processed -= processor_Processed; } void processor_Processing(object sender, EventArgs e) { Console.WriteLine("Tool1 has seen processing."); } void processor_Processed(object sender, EventArgs e) { Console.WriteLine("Tool1 has seen that processing is complete."); }

}

class ProductionDeptTool2 { public void Subscribe( DocumentProcessor processor ) { processor.Processing += (sender, e) => Console.WriteLine("Tool2 has seen processing."); processor.Processed += (sender, e) => Console.WriteLine("Tool2 has seen that processing is complete."); } }

icmp type 255 udp dpt:5353 udp dpt:631 tcp dpt:631 state RELATED,ESTABLISHED state NEW tcp dpt:22 reject with

To subscribe to an event we use the += operator, with a suitable delegate. You can see in ProductionDeptTool1.Subscribe that we used the standard delegate syntax, and in ProductionDeptTool2.Subscribe we used the lambda expression syntax.

Of course, you don t have to subscribe to events in methods called Subscribe you can do it anywhere you like!

When you re done watching an event for any reason, you can unsubscribe using the -= operator and another delegate to the same method. You can see that in the ProductionDeptTool1.Unsubscribe method. When you subscribe to an event your subscriber implicitly holds a reference to the publisher. This means that the garbage collector won t be able to collect the publisher if there is still a rooted reference to the subscriber. It is a good idea to provide a means of unsubscribing from events you are no longer actively observing, to avoid growing your working set unnecessarily. Let s add some code to our Main method to make use of the two new tools, as shown in Example 5-23.

Tip: Always use the n flag to display numeric addresses. Using DNS names in the firewall is unsafe because at

static void Main(string[] args) { // ... ProductionDeptTool1 tool1 = new ProductionDeptTool1(); tool1.Subscribe(processor); ProductionDeptTool2 tool2 = new ProductionDeptTool2(); tool2.Subscribe(processor); documentBeingProcessed = "(Document 1)"; // ... } Console.ReadKey();

Figure 8-3. SimpleActivity in the Toolbox Drag and drop the SimpleActivity from the Toolbox to the workflow. You ll see the same behavior as last time: there s a lock in the upper-left corner of each Code activity within the SimpleActivity. Execute the workflow, and you ll see the message boxes appear as they did with the last example.

If we compile and run, we now see the following output:

boot time when the firewall is loaded, the DNS will not be available, which means your firewall will fail to start. Using n will remind you to always use IP addresses.

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