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paint the court as though it were a 1-meter-wide robot, just because we forgot to initialize it Looking at the distances traveled and the angles through which it has turned, the answer is clearly no!

Constraints such as this are useful in lots of cases. We might want to ensure that some UI element not extend off the screen, or grow too big or small, for example. But equally, an online banking application that doesn t permit transactions less than $10 shouldn t just clamp the amount the user entered from $1 to $10 and carry on happily!

If you look at the CultureInfo class, you ll see numerous properties, some of which define the culture s rules for formatting particular kinds of information. For example, there are the DateTimeFormat and NumberFormat properties. These are instances of Date TimeFormatInfo and NumberFormatInfo, respectively, and expose a large number of properties with which you can control the formatting rules for the relevant types. These types also implement IFormatProvider, so you can use these types to provide your own custom formatting rules to the string formatting methods we looked at earlier. Example 10-48 formats a number in an unusual way.

We will refer to the individual signature and certificate components of sig as sig.S and sig.C, respectively. The signature, sig, can be verified by any other party using Verify():

double value = 1.8; NumberFormatInfo nfi = new NumberFormatInfo(); nfi.NumberDecimalSeparator = "^"; Console.WriteLine(value.ToString(nfi));

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Here we use the NumberFormatInfo to change the decimal separator to the circumflex (hat) symbol. The resultant output is:

1^8

You can use this to control all sorts of features of the formatting engine, such as the default precision, percentage and positive/negative symbols, and separators. Now that we know how to format strings of various kinds, we ll go back to looking at some of the features of the string itself. In particular, we ll look at how to slice and dice an existing string in various ways.

Earlier, we saw how to enumerate the characters in a string; however, we often want to be able to retrieve a character at a particular offset into the string. String defines an indexer, so we can do just that. Example 10-49 uses the indexer to retrieve the character at a particular (zero-based) index in the string.

A new folder will appear in the project list called NewFolder. It will be highlighted so that you can rename it, so type MyBlocks. Remember what you learned in 7 blocks are made up of a definition XML file and a JavaScript execution file. So we will create both of them. Right-click the MyBlocks folder, and select Add New Item (see Figure 9-8).

In the preceding equation, we use the discrete logic operator to imply the logical AND operation. The conditions A and B must both hold true for A B to be true. The Verify() function checks that (1) the signature component (sig.S) successfully verifies against the message using the principal s public key, (2) the principal s certificate was signed by the CA, (3) the name of the principal matches the name in the signing certificate, and (4) the certificate has not expired. Should any of those checks fail, the entire verification fails. There have been vulnerabilities in which digital signature verifications have not been performed correctly. For instance, in June 2000, Microsoft fixed a vulnerability in which Internet Explorer web browsers did not correctly verify the expiration date or the domain name (principal) for requests from HTML frames or images (see www.ciac.org/ciac/ bulletins/k-049.shtml).

string myString = "Indexing"; char theThirdCharacter = myString[2]; Console.WriteLine(theThirdCharacter);

If you execute that code in a console application, you ll see:

d

What if we try to use the indexer to assign a value (i.e., to replace the character at that location in the string) as in Example 10-50

Well, that doesn t compile. We get an error:

15.3.3. Registration Authorities (RAs)

Once a string has been created, it is immutable. You can t slice it up into substrings, trim characters off it, add characters to it, or replace one character or substring with another. What I hear you ask. Then how are we supposed to do our string processing Don t worry, you can still do all of those things, but they don t affect the original string copies (of the relevant pieces) are made instead. Why did the designers of the .NET Framework make strings immutable All that copying is surely going to be an overhead. Well, yes, it is, and sometimes you need to be aware of it. That being said, there are balancing performance improvements when dealing with unchanging strings. The framework can store a single instance of a string and then any variables that reference that particular sequence of characters can reference the same instance. This can actually save on allocations and reduce your working set. And in multithreaded scenarios, the fact that strings never change means it s safe to use them

without the cross-thread coordination that is required when accessing modifiable data. As usual, performance considerations are largely a compromise between the competing needs of various possible scenarios. In our view, an overridingly persuasive argument for immutability relates to the safe use of strings as keys. Consider the code in Example 10-51.

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