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C HA PTER 7 XML IN ADO. NET
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Figure 7-22. The XmlElement retrieved by using the GetElementFromRow() method The Load event of the form is shown in Listing 7-24. Listing 7-24. Creating XmlDataDocument XmlDataDocument doc = null; private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\employees.xml"); doc = new XmlDataDocument(ds); dataGridView1.DataSource = ds.Tables[0]; } The code should be familiar to you, because it is the same code from our previous example. The code simply creates an instance of XmlDataDocument on the basis of a DataSet. The code from the Click event handler of the Get Element From Row button is shown in Listing 7-25. Listing 7-25. Using the GetElementFromRow() Method private void button1_Click(object sender, EventArgs e) { int index=dataGridView1.CurrentCell.RowIndex; XmlElement element = doc.GetElementFromRow(doc.DataSet.Tables[0].Rows[index]); MessageBox.Show(element.OuterXml); } The code retrieves the current row index of the DataGridView by using the CurrentCell property of the DataGridView object. Then the GetElementFromRow() method is called by passing the DataRow reference. Notice how the DataSet is accessed by using the DataSet property of the XmlDataDocument class. The return value of GetElementFromRow() is an XmlElement object; the OuterXml property of the XmlElement is then displayed in a message box.
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CHAPTER 7 XML IN A DO.NE T
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Note The GetRowFromElement() method is the counterpart of the GetElementFromRow() method.
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GetRowFromElement() accepts an XmlElement and returns a DataRow corresponding to the element.
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Summary
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ADO.NET is a very important part of the overall .NET Framework. Modern data-driven applications tend to work with relational as well as hierarchical data stores. The ADO.NET object model, though primarily inclined toward RDBMSs, has tight integration with XML. This chapter gave you a thorough understanding of the XML features of ADO.NET. You learned how to work with XML data in connected and disconnected mode. The DataSet class is the cornerstone of the ADO.NET disconnected model and allows you to read and write XML data, and to work with schemas. Further, typed DataSets make your development easy by providing typed DataTable and DataColumn names. The DataSet and the underlying XML document class can be used interchangeably. The XmlDataDocument class provides a bridge between the relational and hierarchical data models involved in such communication.
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XML Serialization
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our .NET applications consist of one or more classes. The objects of these classes are used to store state information. As long as your objects are available in the memory of your application, this state information is readily available. But what if you would like to persist object state across application shutdowns At first you may think of saving object state in a database. However, databases generally store information in relational format, whereas objects often have a hierarchical structure. Moreover, you would need to create many tables in the database on your own. Storing object data in a database comes with its own overheads. Wouldn t it be nice if the entire object state could be stored to a medium and retrieved later That is what serialization offers. Serialization is a process by which object state is persisted to a medium. The medium can be a physical disk file, memory, or even a network stream. The serialized objects can be retrieved later in your application by a process called deserialization. The .NET Framework provides extensive support for serialization and uses serialization in many places. Remoting and web services are two main areas where serialization is heavily used. In this chapter, you are going to learn about the following topics: Understanding the flavors of serialization Using the XmlSerializer class to serialize object state in XML format Customizing the serialization process with the help of certain attributes Using the SoapFormatter class to serialize object state in SOAP format Customizing the SOAP serialization process with the help of certain attributes
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CHAPTER 8 XML S ERIA LIZATION
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Understanding the Flavors of Serialization
Serialization can be classified based on the format of serialization or on the depth of serialization. The three formats in which you can serialize data in the .NET Framework are as follows: Binary: This format is generally better in terms of performance than the others. However, in terms of extensibility and cross-application integration, the other formats are better. XML: Objects serialized in this way are stored as plain XML. If you are talking with multiple heterogeneous systems, this format will prove useful. For example, your .NET applications may serialize objects as XML documents, and a Java application may read these serialized objects by using its standard XML parser and work with the data further. Simple Object Access Protocol (SOAP): Objects serialized in this way store information as per the SOAP standards. SOAP is the core pillar for web services. The other way to classify serialization is based on the depth of serialization. The two flavors based on the depth of serialization are as follows: Deep serialization: This serializes all the public, protected, and private members of your class. Even the nested classes and their public, protected, and private members are serialized. Shallow serialization: This serializes only the public members of your class. In the .NET Framework, the classes that serialize objects in binary format use deep serialization, whereas the classes that serialize objects in XML format use shallow serialization.
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