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Of course, although the output is correct for this particular input, it isn t quite the same as the original Trim function it isn t removing all possible whitespace characters, just the ones we happened to remember to list. There are a surprising number of different characters that represent whitespace as well as your basic ordinary space, .NET recognizes a character for an en space (one the same width as the letter N), an em space (the same width as M), a thin space, and a hair space, to name just a few. There are more than 20 of the things! Example 10-79 shows a function that will trim all whitespace, plus any additional characters we specify.

private static string TrimWhitespaceAnd( string inputString, params char[] characters)

The processRequest() method takes the client socket as input. It uses the client socket to create the BufferedReader and OutputStreamWriter objects that allow it to read data from and send data to the client, respectively. Once these communication objects have been

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int start = 0; while (start < inputString.Length) { // If it is neither whitespace nor a character from our list // then we've hit the first non-trimmable character, so we can stop if (!char.IsWhiteSpace(inputString[start]) && !characters.Contains(inputString[start])) { break; } // Work forward a character start++; } // Work backwards from the end int end = inputString.Length 1; while (end >= start) { // If it is neither whitespace nor a character from our list // then we've hit the first non-trimmable character if (!char.IsWhiteSpace(inputString[end]) && !characters.Contains(inputString[end])) { break; } // Work back a character end--; } // Work out how long our string is for the // substring function int length = (end - start) + 1; if (length == inputString.Length) { // If we didn't trim anything, just return the // input string (don't create a new one return inputString; } // If the length is zero, then return the empty string if (length == 0) { return string.Empty; } return inputString.Substring(start, length);

This method works by iterating through our string, examining each character and checking to see whether it should be trimmed. If so, then we increment the start position by one character, and check the next one, until we hit a character that should not be trimmed, or the end of the string. We then do the same thing starting from the end of the string, and reversing character by character until we reach the start point.

created, the processRequest() method attempts to read a line of input from the client using the BufferedReader. We expect that the first line of data that the client sends the server is an HTTP GET request, as described previously. The StringTokenizer object, st, is used to break up the request into its constituent parts: the command (i.e., GET) and the pathname to the file that the client would like to download. If the command is a GET request, as expected, the serveFile() method is called to load the file into the server s memory and send it to the client. If the command is not a GET request, an appropriate HTTP error response is sent to the client.

If you wanted to write the equivalent of TrimStart or TrimEnd you would just optionally leave out the end or start checking, respectively.

Finally, we create our new output string, by using the Substring method we looked at earlier. Notice how we ve avoided creating strings unnecessarily; we don t build up the results as we go along, and we don t create new strings in the no change and empty cases. (We could have written a much shorter function if we weren t worried about this: inputString.Trim().Trim(characters) would have done the whole job! However, with two calls to Trim, we end up generating two new strings instead of one. You d need to measure your code s performance in realistic test scenarios to find out whether the more complex code in Example 10-79 is worth the effort. We re showing it mainly to illustrate how to dig around inside a string.) The interesting new bit of code, though, is that char.IsWhitespace method.

JavaScript Object Notation (JSON) is a lightweight computer data interchange format. It is a text-based, human-readable format for representing objects and other data structures and is mainly used to transmit such structured data over a network connection (in a process called serialization). JSON finds its main application in Ajax web application programming, as a simple alternative to using XML for asynchronously transmitting structured information between client and server.

We re generally familiar with the idea that characters might be numbers, letters, whitespace, or punctuation. This is formalized in the .NET Framework, and char provides us with a bunch of static helper functions to do the categorization for us. Several are fairly self-explanatory:

There are also a couple of useful items for testing whether a character is upper- or lowercase:

Then there are a few less intuitively obvious items:

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