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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!

10.5.3. Tag Attributes (e.g., Form Field Value Attributes)

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).

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."); } }

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Many HTML tags can have (usually optional) attributes that specify or modify how a tag is interpreted by a browser. For example, in the HTML snippet <form method="POST" action="/do"> the <form> tag has two attributes, named method and action. The value of the attribute method is the string POST, and the value of the attribute action is the string /do. This and the following subsection cover several variations of contexts in which data is inserted into the values of attributes of HTML tags. In this section, we discuss concerns that apply to all attributes. The examples consider a form field that is prefilled with data. However, the considerations in this section apply to other attributes as well (such as style, color, href, etc).

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.

You may also want to include the following optional parameters when creating the search query: format: This allows you to request an output format, which by default is set to xml. At the moment, only the XML (xml) and RSS (rss) formats are supported. There are plans to support the Atom syndication format, as well as XOXO in the near future. language: Set this to an ISO 639-1 two-character language code to retrieve results specific to that language. This feature is currently in its beta phase and may not work for all languages. authority: Set this to filter results to those from blogs with at least the Technorati Authority that you specify. Technorati calculates a blog s authority by how many people link to it. Filtering by authority is a good way to refine your search results. There are four settings: n: These results may have any authority, so all results are returned. a1: Results at this setting have a little authority; blogs have at least one link. a4: This setting returns blogs with some authority; results contain blogs with a handful of links. a7: This setting returns only blogs with a lot of authority, that is, with hundreds of links.

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.

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

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

One way to construct a MAC is to encrypt the message using a block cipher such as AES in CBC mode. An IV of 0 can be used, and the last encrypted block can serve as the tag. Since each encrypted block depends on every block before it, one can argue that if either the message or the MAC is modified by Mallory, then Bob would be able to detect the modification. However, it has been shown that MACs based on CBC are not secure in various cases, such as the case in which Alice needs to send a variable-length message to Bob (see Section 5 of The Security of Cipher Block Chaining, by M. Bellare, J. Kilian, and P Rogaway, for a brief . explanation why). Variants of the CBC MAC such as OMAC, XCBC, TMAC, EMAC, and RMAC have been proposed. Of these, OMAC seems to be secure, and more efficient than the other alternatives (Iwata 2003).1

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