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Figure 4-15: A sample application to test the class's ability to add and delete nodes. Note The entire sample code illustrating the XmlTextReadWriter class and its way of working is available in this book's sample files. The all-encompassing Microsoft Visual Studio .NET solution is named XmlReadWriter.

Returns a particular date based on year, month, and day columns. Returns an integer corresponding to the day of the week using Sunday (1) through Saturday (7) as the default. For Monday (1) through Sunday (7), use =WEEKDAY ([Column1],2); for Monday (0) through Sunday (6), use =WEEKDAY ([Column1],3). Extracts the year from a date. Extracts the month from a date. Extracts the day from a date. Decimal representation of the time of day. Extracts the hour from a date value. Extracts the minutes from a date value. Extracts the seconds from a date value.

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A Full-Access CSV Editor In 2, we looked at the XmlCsvReader class as an example of a custom XML reader. The XmlCsvReader class enables you to review the contents of a CSV file through nodes and attributes and the now-familiar semantics of XML readers. In this section, I'll go one step further and illustrate a full-access CSV reader capable of reading and writing the XmlCsvReadWriter class. The new class inherits from XmlCsvReader and modifies only a few methods and properties. The XmlCsvReadWriter class works by using a companion output stream in which each row read and modified is then persisted prior to reading a new row. The XmlCsvReadWriter class is declared as follows: public class XmlCsvReadWriter : XmlCsvReader 160

You can begin by adding text to the existing boxes. Click within a box and begin typing. The placeholder text that first appears will disappear when you start typing. You can format the text as you would in any other part of your document by using the buttons on the Formatting toolbar. You can change the font color and size, add bullets and numbers, add highlights, and change the alignment within the box. For more advanced options, right-click in the box and select Paragraph, as shown in Figure 7-3. This will give you more options for the way the text appears within the box. Or, select Font to specify more detailed options for the font itself.

{ public XmlCsvReadWriter( string filename, bool hasColumnHeaders, bool enableOutput) { .. } .. } The class has a new constructor with a third argument the Boolean value enableOutput, which specifies whether the class should use a hidden output stream Basically, by setting enableOutput to true, you declare your intent to use the class as a reader/writer instead of a simple reader When this happens, the constructor creates a temporary file and a stream writer to work on it At the end of the reading, this output file contains the modified version of the CSV and is used to replace the original file A new property, named EnableOutput, can be used to programmatically enable and disable the output stream Shadowing the Class Indexer The Item indexer property that is, the property that permits the popular reader[index] syntax is declared as read-only in the abstract XmlReader base class.

=DATE([Year], [Month],[Day])

This means that any derived class can't replace that property with another one that is read/write However, the XmlCsvReader class provides a total implementation of the abstract functionality defined in XmlReader So when deriving from XmlCsvReader, you can simply shadow the base Item property and replace it with a brand-new one with both get and set accessors The following code is at the heart of the new CSV reader/writer class It extends the Item property to make it work in a read/write fashion The get accessor is identical to the base class The set accessor copies the specified value in the m_tokenValues collection, in which the attributes of the current CSV row are stored (See 2 for more details about the internal architecture of the CSV sample XML reader) new public string this[int i] { get { return base[i].

ToString(); } set { // The Item[index] property is read-only, so // use the Item[string] overload string key = m_tokenValuesKeys[i]ToString(); m_tokenValues[key] = value; } } Notice the use of the new keyword to shadow the same property defined on the base class This trick alone paves the road for the read/write feature 161.

39021 or 10/31/2006

When you re adding text to a box in an organization chart, you can also add images this can be especially helpful when you are creating charts of a department. To insert an image, click Insert Picture From File. Navigate through the Insert Picture dialog box, shown in Figure 7-4, to find the correct image. Word accepts a wide variety of image types.

The new keyword is C#-specific To achieve the same effect with Microsoft Visual Basic NET, you must use the Shadows keyword Also note that, when it comes to overloading a method in a derived class, you don't need to mark it in any way if the language of choice is C# If you use Visual Basic NET, the overload must be explicitly declared using the Overloads keyword In addition, bear in mind that a standard NameValueCollection object allows you to update a value only if you can pass the key string to the indexer, as shown here: public string this[int] {get;} Note public string this[string] {get; set;} The new Item indexer property allows you to write code, as the following code snippet demonstrates: for(int i=0; i<readerAttributeCount; i++) { if (reader[i] == "Sales Representative") reader[i] = "SalesMan"; ...

WEEKDAY([Column1])

} The reader's Read method copies the contents of the current CSV row in the input stream, and from there the indexer will draw the values to return When updated, the indexer overwrites values in the internal memory collection When will changes actually be persisted to the CSV output stream Persisting Changes During the Next Read The Read method moves the internal pointer of an XML reader one element ahead An XML CSV reader moves that pointer to the next row The contents of the newly selected row is buffered into a local and transient structure the m_tokenValues collection for further use and investigation However, when the Read method is called to move ahead, all the changes on the current element have been performed This is a great time to persist those changes to the output stream if a stream is enabled.

After that, you go on as usual with the Read base class's implementation, as shown here: public override bool Read() { if (!EnableOutput) return baseRead(); // If we're not reading the first row, then save the the // current status to the output stream (If we're reading // first row, then the token collection is empty and there's // nothing to persist if (m_tokenValuesCount >0) { // If writing the first row, and used the first source 162.

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