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The FileStream class provides an implementation for the abstract Stream members in a manner appropriate for file-based streaming. It is a fairly primitive stream; it can read or write only a single byte or an array of bytes. In reality, you will not often need to directly interact with the members of the FileStream type. Rather, you will most likely make use of various stream wrappers, which make it easier to work with textual data or .NET types. Nevertheless, for illustrative purposes, let s experiment with the synchronous read/write capabilities of the FileStream type. Assume you have a new console application named FileStreamApp. Your goal is to write a simple text message to a new file named myMessage.dat. However, given that FileStream can operate only on raw bytes, you will be required to encode the System.String type into a corresponding byte array. Luckily, the System.Text namespace defines a type named Encoding, which provides members that encode and decode strings to (or from) an array of bytes (check out the .NET Framework 2.0 SDK documentation for full details of the Encoding type). Once encoded, the byte array is persisted to file using the FileStream.Write() method. To read the bytes back into memory, you must reset the internal position of the stream (via the Position property) and call the ReadByte() method. Finally, you display the raw byte array and the decoded string to the console. Here is the complete Main() method: // Don't forget to 'use' System.Text. static void Main(string[] args) { Console.WriteLine("***** Fun with FileStreams *****\n"); // Obtain a FileStream object. FileStream fStream = File.Open(@"C:\myMessage.dat", FileMode.Create);

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// Encode a string as an array of bytes. string msg = "Hello!"; byte[] msgAsByteArray = Encoding.Default.GetBytes(msg); // Write byte[] to file. fStream.Write(msgAsByteArray, 0, msgAsByteArray.Length); // Reset internal position of stream. fStream.Position = 0; // Read the types from file and display to console. Console.Write("Your message as an array of bytes: "); byte[] bytesFromFile = new byte[msgAsByteArray.Length]; for (int i = 0; i < msgAsByteArray.Length; i++) { bytesFromFile[i] = (byte)fStream.ReadByte(); Console.Write(bytesFromFile[i]); } // Display decoded messages. Console.Write("\nDecoded Message: "); Console.WriteLine(Encoding.Default.GetString(bytesFromFile)); // Close stream. fStream.Close(); } While this example does indeed populate the file with data, it punctuates the major downfall of working directly with the FileStream type: it demands to operate on raw bytes. Other Stream-derived types operate in a similar manner. For example, if you wish to write a sequence of bytes to a region of memory, you can allocate a MemoryStream. Likewise, if you wish to push an array of bytes through a network connection, you can make use of the NetworkStream type. Thankfully, the System.IO namespace provides a number of reader and writer types that encapsulate the details of working with Stream-derived types.

Figure 2-25. Selecting a manager In the Macro window, run the GetSelectedManagerEmployeeListSQL subroutine, the results of which are shown in Figure 2-26.

The StreamWriter and StreamReader classes are useful whenever you need to read or write characterbased data (e.g., strings). Both of these types work by default with Unicode characters; however, you can change this by supplying a properly configured System.Text.Encoding object reference. To keep things simple, let s assume that the default Unicode encoding fits the bill. StreamReader derives from an abstract type named TextReader, as does the related StringReader type (discussed later in this chapter). The TextReader base class provides a very limited set of functionality to each of these descendents, specifically the ability to read and peek into a character stream. The StreamWriter type (as well as StringWriter, also examined later in this chapter) derives from an abstract base class named TextWriter. This class defines members that allow derived types to write textual data to a given character stream. The relationship between each of these new I/Ocentric types is shown in Figure 16-7.

To aid in your understanding of the core writing capabilities of the StreamWriter and StringWriter classes, Table 16-7 describes the core members of the abstract TextWriter base class. Table 16-7. Core Members of TextWriter

fieldset fieldset legend { font-size: 1.2em; } Here, we ve adjusted the margin on nested fieldset elements, given them a different background color, and also made their labels a bit smaller (Figure 11-8).

Close() Flush() NewLine Write() WriteLine()

Closes the writer and frees any associated resources. In the process, the buffer is automatically flushed. Clears all buffers for the current writer and causes any buffered data to be written to the underlying device, but does not close the writer. Indicates the newline constant for the derived writer class. The default line terminator is a carriage return followed by a line feed (\r\n). Writes a line to the text stream without a newline constant. Writes a line to the text stream with a newline constant.

Now it s time to let Excel 2007 do some real work. We ve seen a few different methods of retrieving data. Let s see what we can do to provide some updating capabilities to our worksheets. In this example, we will import a list of employees with some personal data ( personal data as defined by the AdventureWorks database; I don t know that many of us would agree that this meets our definition). Once we have that list, we ll create a routine that lets us update any information that has changed.

The last two members of the TextWriter class probably look familiar to you. If you recall, the System. Console type has Write() and WriteLine() members that push textual data to the standard output device. In fact, the Console.In property wraps a TextWriter, and the Console.Out property wraps a TextReader.

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