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Such a system log could even potentially be used as evidence in a court of law It is also crucial to make sure that when the logging is done and audit trails are kept, the logs cannot be deleted or modified after the fact For example, you would not want the CFO to be able to transfer money into her own personal account and then delete or change the audit trail so that transaction no longer appears, or is covered up in any way to appear as if the transaction had a different recipient To prevent logs from being deleted or altered, they could immediately be transferred to another system that hopefully an attacker would not be able to access as easily.

We ve changed the signature of that method, so all our clients are sadly broken. They need to be rewritten to use the new method. That s not great. A better alternative is to provide both signatures keep the old single-parameter contract around, but add an overload with the extra argument. And to ensure that the overloads behave consistently (and to avoid duplicating code) we can make the simpler method call the new method as its actual implementation. The old method was just the equivalent of calling the new method with a delay of zero, so we could replace it with the method shown in Example 3-33. This lets us provide the newly enhanced SendMessage, while continuing to support the old, simpler version.

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The Tester directory holds the development examples and the block test harness (more on the test harness later). BlockSchema.xsd is an XML document used to validate the XML structure of blocks. If you recall from 7, XML documents are used to describe a block s operations and properties. The Adobe PDF document called Building Blocks.pdf is the documentation of the SDK. It has a brief overview of the block creation process. The Types.xsd document is another XML schema document; it s used to validate the types of objects that can be described in a block s operations and properties, for example, URL, string, decimal, and so on.

public void SendMessage(string messageName) { SendMessage(messageName, TimeSpan.Zero); }

(TimeSpan.Zero is a static field that returns a duration of zero.) Until C# 4.0 that s as far as we could go. However, the C# designers noticed that a lot of member overloads were just like this one: facades over an ber-implementation, with a bunch of parameters defaulted out to particular values. So they decided to make it easier for us to support multiple variations on the same method. Rather than writing lots of overloads, we can now just specify default values for a method s arguments, which saves us typing a lot of boilerplate, and helps make our default choices more transparent. Let s take out the single-parameter method overload we just added, and instead change the declaration of our multiparameter implementation, as shown in Example 3-34.

public void SendMessage( string messageName, TimeSpan delay = default(TimeSpan))

Even though we ve only got one method, which supports two arguments, code that tries to call it with a single argument will still work. That s because default values can fill in for missing arguments. (If we tried to call SendMessage with no arguments at all, we d get a compiler error, because there s no default for the first argument here.) But it doesn t end there. Say we had a method with four parameters, like this one:

Also, 15 discusses how MACs (message authentication codes) can be used to construct integrity check tokens that can either be added to each entry of a log or associated with an entire log file to allow you to detect any potential modifications to the system log You can also use write once, read many (WORM) media to store system logs, since once written, these logs may be hard (or even physically impossible) to modify short of destroying the media completely..

public void MyMethod( int firstOne, double secondInLine = 3.1416, string thirdHere = "The third parameter", TimeSpan lastButNotLeast = default(TimeSpan)) { // ... }

If we want to call it and specify the first parameter (which we have to, because it has no default), and the third, but not the second or the fourth, we can do so by using the names of the parameters, like this:

MyMethod(127, thirdHere: "New third parameter");

With just one method, we now have many different ways to call it we can provide all the arguments, or just the first and second, or perhaps the first, second, and third. There are many combinations. Before named arguments and defaults were added in C# 4.0, the only way to get this kind of flexibility was to write an overload for each distinct combination.

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