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Linking Tables and Views The link between the DataTable object and the DataView object is typically established at creation time through the constructor, as shown here: public DataView(DataTable table); However, you could also create a new view and associate it with a table at a later time using the DataView object's Table property, as in the following example: DataView dv = new DataView(); dvTable = dataSetTables["Employees"]; You can also obtain a DataView object from any table In fact, the DefaultView property of a DataTable object simply returns a DataView object initialized to work on that table, as shown here: DataView dv = dtDefaultView; Originally, the view is unfiltered, and the index array contains as many elements as there are rows in the table Getting Views of Rows The contents of a DataView object can be scrolled through a variety of programming interfaces, including collections, lists, and enumerators.

Figure 1-3. When a site administrator adds a new user, the administrator can choose the level of permission to assign the user.

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The GetEnumerator method in particular ensures that you can walk your way through the records in the view using the familiar foreach statement The following code shows how to access all the rows that fit into the view: DataView myView = new DataView(table); foreach(DataRowView rowview in myView) { // Dereferences the DataRow object DataRow row = rowviewRow; } When client applications access a particular row in the view, the class expects to find it in an internal rows cache If the rows cache is not empty, the specified row is returned to the caller via an intermediate DataRowView object The DataRowView object is a wrapper for the DataRow object that contains the actual data You access row data through the Row property If the rows cache is empty, the DataView class fills it with an array of DataRowView objects, each of which references an original DataRow object.

The rows cache can be empty either because it has not yet been used or because the sort expression or the filter string has been changed in the meantime Serializing DataView Objects The AdoNetXmlSerializer class also provides overloaded methods to serialize a DataView object You build a copy of the original DataTable object with all the rows (and only those rows) that match the view, as shown here: public static void WriteDataView(DataView dv, string outputFile, XmlWriteMode mode) 341.

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{ DataTable dt = CreateTempTable(dv); WriteDataTable(dt, outputFile, mode); } You create a temporary DataTable object and then serialize it to XML using the previously defined methods. The structure of the internal CreateTempTable routine is fairly simple, as shown here: private static DataTable CreateTempTable(DataView dv) { // Create a temporary DataTable with the same structure // as the original DataTable dt = dv.Table.Clone(); // Fill the DataTable with all the rows in the view foreach(DataRowView rowview in dv) dt.ImportRow(rowview.Row); return dt; } The ImportRow method creates a new row object in the context of the table. Like many other ADO.NET objects, the DataRow object can't be referenced by two container objects at the same time. Using ImportRow is logically equivalent to cloning the row and then adding the clone as a reference to the table. Figure 9-8 shows a DataView object saved to XML.

There are basically two ways to serialize ADONET objects: using the object's own XML interface, and using NET Framework data formatters So far, we have reviewed the DataSet object's methods for serializing data to XML, and you've learned how to persist other objects like DataTable and DataView to XML Let's look now at what's needed to serialize ADONET objects using the standard NET Framework data formatters The big difference between methods like WriteXml and NET Framework data formatters is that in the former case, the object itself controls its own serialization process When NET Framework data formatters are involved, any object can behave in one of two ways The object can declare itself as serializable (using the Serializable attribute) and passively let the formatter extrapolate any significant information that needs to be serialized This type of object serialization uses .

A SharePoint site is nothing more than a web site, but it s a web site with a distinct advantage. Rather than using web site design tools or HTML to lay content out on blank pages, a SharePoint site consists of web part pages, web parts, document libraries, and lists. A web part is a component designed to display specific information, such as an announcements list, a calendar, or a document library. A web part page is a web page that contains preestablished zones where web parts can be positioned. Figure 1-4 shows a newly created web part page and a list of available web parts to add to the page.

NET Framework reflection to list all the properties that make up the state of an object The second behavior entails the object implementing the ISerializable interface, thus passing the formatters the data to be serialized After this step, however, the object no longer controls the process A class that neither is marked with the Serializable attribute nor implements the ISerializable interface can't be serialized No ADONET class declares itself as serializable, and only DataSet and DataTable implement the ISerializable interface For example, you can't serialize to any NET Framework formatters a DataColumn or a DataRow object Ordinary NET Framework Serialization The NET Framework comes with two predefined formatter objects defined in the SystemRuntimeSerializationFormatters namespace the binary formatter and the SOAP formatter The classes that provide these two serializers are BinaryFormatter and SoapFormatter The former is more efficient, is faster, and produces more compact code.

Figure 1-4. You can add web parts to a web part page to display information such as announcements, events, and document libraries.

The latter is designed for interoperability and generates a SOAP-based description of the class that can be easily consumed on non-NET platforms Note A formatter object is merely a class that implements the IFormatter interface to support the serialization of a graph of objects The SoapFormatter and BinaryFormatter classes also implement the IRemotingFormatter interface to support remote procedure calls across AppDomains No technical reasons prevent you from implementing custom formatters In most cases, however, you only need to tweak the serialization process of a given class instead of creating an extension to the general serialization mechanism Quite often, this objective can be reached simply by implementing the ISerializable interface..

To add your own AutoText entries, click Insert AutoText and select AutoText on the submenu. In the Box labeled Enter AutoText Entries here, type your AutoText entry (see Figure 9-12). Then click Add. Repeat for each entry you d like to create. Once you re done, click OK.

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