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while(rw.Read()) { switch(rw.NodeType) { case XmlNodeType.Element: rw.Writer.WriteStartElement(prefix, rw.Reader.LocalName, null); rw.Writer.WriteAttributes(rw.Reader, false); if (rw.Reader.IsEmptyElement) rw.Writer.WriteEndElement(); break; } } // Close the root tag rw.Writer.WriteEndElement(); // Close the document and any internal resources rw.WriteEndDocument(); } The code starts by manually writing the root node of the source file. Next it adds an xmlns attribute with the specified prefix and the URN. The main loop scans all the contents of the XML file below the root node. For each element node, it writes a fully qualified new node whose name is the just-read local name with a prefix and namespace URN supplied by the caller, as shown here: rw.Writer.WriteStartElement(prefix, rw.Reader.LocalName, null); Because attributes are unchanged, they are simply copied using the writer's WriteAttributes method, as shown here: rw.Writer.WriteAttributes(rw.Reader, false); The node is closed within the loop only if it has no further contents to process. Figure 413 shows the sample application. In the upper text box, you see the original file. The bottom text box contains the modified document with the specified namespace information.

Returns the smallest value among the arguments Returns the most frequently recurring value among the arguments Gives an estimate of standard deviation, or how widely values are dispersed from the average

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Figure 4-13: All the nodes in the XML document shown in the bottom text box now belong to the specified namespace Updating Attribute Values The ultimate goal of our second example is changing the values of one or more attributes on a specified node The XmlTextReadWriter class lets you do that in a single visit to the XML tree You specify the node and the attribute name as well as the old and the new value for the attribute In general, the old value is necessary just to ensure that you update the correct attribute on the correct node In fact, if an XML document contains other nodes with the same name, you have no automatic way to determine which is the appropriate node to update Checking the old value of the attribute is just one possible workaround.

To create an organization chart, place the cursor where you would like to insert the chart. It can be in a separate document, or you can insert it within another document. On the Insert menu, select Picture Organization Chart (see Figure 7-1).

=MIN([Small], [Medium],[Large], [Extra Large], [2X]) =MODE([Small], [Medium],[Large], [Extra Large], [2X])

If you can make some assumptions about the structure of the XML document, this constraint can be easily released As mentioned, the update takes place by essentially rewriting the source document, one node at a time In doing so, you can use updated values for both node contents and attributes The attributes of a node are written in one shot, so multiple changes must be cached somewhere There are two possibilities One approach passes through the addition of enrichment of a set of properties and methods that more closely mimics the reader You could expose a read/write Value property Next, when the property is written, you internally cache the new value and make use of it when the attributes of the parent node are serialized Another approach the one you see implemented in the following code is based on an explicit and application-driven cache.

Each update is registered using an internal DataTable object made up of four fields: node name, attribute name, old value, and new value rwAddAttributeChange(nodeName, attribName, oldVal, newVal); The same DataTable object will contain attribute updates for each node in the document To persist the changes relative to a specified node, you use the XmlTextReadWriter class's WriteAttributes method, shown here: public void WriteAttributes(string nodeName) { 155.

MODE([Column1], [Column2],[Column3])

if (m_reader.HasAttributes) { // Consider only the attribute changes for the given node DataView view = new DataView(m_tableOfChanges); view.RowFilter = "Node='"+ nodeName + "'"; while(m_reader.MoveToNextAttribute()) { // Begin writing the attribute m_writer.WriteStartAttribute(m_reader.Prefix, m_reader.LocalName, m_reader.NamespaceURI); // Search for a corresponding entry // in the table of changes DataRow[] rows = m_tableOfChanges.Select("Attribute='"+ m_reader.LocalName + "' AND OldValue='"+ m_reader.Value + "'"); if (rows.Length >0) { DataRow row = rows[0]; m_writer.WriteString(row["NewValue"].ToString()); } else m_writer.WriteString(m_reader.Value); } } // Move back the internal pointer m_reader.MoveToElement(); // Clear the table of changes m_tableOfChanges.Rows.Clear(); m_tableOfChanges.AcceptChanges(); } The following code, called by a client application, creates a copy of the source document and updates node attributes: void UpdateValues(string nodeName, string attribName, string oldVal, string newVal) 156

As you see in Figure 7-2, Word will insert a basic organization chart with one top-level box and three subordinate levels. Additionally, the Organization Chart toolbar opens.

{ XmlTextReadWriter rw; rw = new XmlTextReadWriter(inputFile, outputFile); rw.WriteStartDocument(); // Modify the root tag manually rw.Writer.WriteStartElement(rw.Reader.LocalName); // Prepare attribute changes rw.AddAttributeChange(nodeName, attribName, oldVal, newVal); // Loop through the document while(rw.Read()) { switch(rw.NodeType) { case XmlNodeType.Element: rw.Writer.WriteStartElement(rw.Reader.LocalName); if (nodeName == rw.Reader.LocalName) rw.WriteAttributes(nodeName); else rw.Writer.WriteAttributes(rw.Reader, false); if (rw.Reader.IsEmptyElement) rw.Writer.WriteEndElement(); break; } } // Close the root tag rw.Writer.WriteEndElement(); // Close the document and any internal resources rw.WriteEndDocument(); }

STDEV([Column1], [Column2],[Column3])

Figure 4-14: The code can be used to change the value of the forecolor attribute from blue to black. Adding and Deleting Nodes A source XML document can also be easily read and modified by adding or deleting nodes. Let's look at a couple of examples. To add a new node, you simply read until the parent is found and then write an extra set of nodes to the XML writer. Because there might be other nodes with the same name as the parent, use a Boolean guard to ensure that the insertion takes place only once. The following code demonstrates how to proceed: void AddUser(string name, string pswd, string role) { XmlTextReadWriter rw; rw = new XmlTextReadWriter(inputFile, outputFile); rw.WriteStartDocument(); // Modify the root tag manually rw.Writer.WriteStartElement(rw.Reader.LocalName); // Loop through the document bool mustAddNode = true; // Only once while(rw.Read()) { switch(rw.NodeType) { case XmlNodeType.Element: rw.Writer.WriteStartElement(rw.Reader.LocalName); if ("Users" == rw.Reader.LocalName && mustAddNode) 158

=STDEV([Small], [Medium],[Large], [Extra Large], [2X])

{ mustAddNode = false; rw.Writer.WriteStartElement("User"); rw.Writer.WriteAttributeString("name", name); rw.Writer.WriteAttributeString("password", pswd); rw.Writer.WriteAttributeString("role", role); rw.Writer.WriteEndElement(); } else rw.Writer.WriteAttributes(rw.Reader, false); if (rw.Reader.IsEmptyElement) rw.Writer.WriteEndElement(); break; } } // Close the root tag rw.Writer.WriteEndElement(); // Close the document and any internal resources rw.WriteEndDocument(); }

To delete a node, you simply ignore it while reading the document. For example, the following code removes a <User> node in which the name attribute matches a specified string: while(rw.Read()) { switch(rw.NodeType) { case XmlNodeType.Element: if ("User" == rw.Reader.LocalName) { // Skip if name matches string userName = rw.Reader.GetAttribute("name"); if (userName == name) break; } // Write in the output file if no match has been found 159

Date functions are some of the most widely used functions available for use in SharePoint lists. With date functions, you can subtract dates to find out the difference in days; you can calculate what weekday a specific date is; and you can extract year, month, day, hour, minute, and second values from dates and times. With these functions, you can do analyses and projections based on date data. For example, let s say an expense must be submitted by the fifth day of the month after the expense was incurred in order to be paid that month. Using the MONTH function, you could automatically calculate the next month based on the expense date. Table 5-5 shows you more about the date and time functions.

As the figure shows, there are only a few parts to an organization chart: the shapes that hold a person, process, or department; the connector lines that connect the shapes, showing relationships; and the frame that surrounds the chart.

rw.Writer.WriteStartElement(rw.Reader.LocalName); rw.Writer.WriteAttributes(rw.Reader, false); if (rw.Reader.IsEmptyElement) rw.Writer.WriteEndElement(); break; } }

Figure 4-15 shows this code in action. The highlighted record has been deleted because of the matching value of the name attribute.

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

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