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Although this part of the book is named LINQ to DataSet, you will find that the added operators really pertain to DataTable, DataRow, and DataColumn objects Don t be surprised that you don t see DataSet objects referenced often in this chapter We understand that in real-life circumstances, your DataTable objects will almost always come from DataSet objects However, for the purpose of database independence, brevity, and clarity, we have intentionally created simple DataTable objects programmatically, rather than retrieved them from a database, for most of the examples The LINQ to DataSet operators consist of several special operators from multiple assemblies and namespaces that allow the developer to do the following: Perform set operations on sequences of DataRow objects Retrieve and set DataColumn values Obtain a LINQ standard IEnumerable<T> sequence from a DataTable so Standard Query Operators may be called Copy modified sequences of DataRow objects to a DataTable.

Since it provides functionality that might be useful in another context, FontPropertiesPanel appears to be a good candidate for reuse if it can be decoupled from SampleTextFrame. The existing dependence is because FontPropertiesPanel calls refreshDisplayFont() directly. Consequently, FontPropertiesPanel depends not only upon the existence of SampleTextFrame but also upon it implementing the refreshDisplayFont() method. Obviously, changes to the font must be communicated to the text display somehow but in a way that allows FontPropertiesPanel and SampleTextFrame to be loosely coupled.

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Properties onLine property - Indicates whether or not the system is connected to the network with a Boolean value. When connected to a network and when IE is not running in Offline Mode, true is returned; false is returned otherwise. In IE7 and below, this property indicates only if the browser is running normally (true) or in Offline Mode (false). onoffine event - Fired whenever Internet Explorer detects a loss of network connectivity or the browser has entered Offline Mode. ononline event - Fired whenever Internet Explorer detects that network connectivity has resumed or the browser has left Offline Mode.

In addition to these LINQ to DataSet operators, once you have called the AsEnumerable operator, you can call the LINQ to Objects Standard Query Operators on the returned sequence of DataRow objects, resulting in even more power and flexibility.

One solution to this problem is to use a technique that s simple but powerful: couple a class to an interface instead of another class. For example, you might create an interface called FontListener that defines a single fontChanged() method, which is called when the font property value changes. In fact, you can use this technique to reduce SampleTextFrame s dependence upon FontPropertiesPanel as well. Notice that currently when a property changes, SampleTextFrame is responsible for extracting the font properties from FontPropertiesPanel and using that information to construct an instance of Font. This is a poor design not only because it makes the two classes more tightly coupled but also because it actually requires more code than building a Font instance inside of FontPropertiesPanel, which has all the information needed to do so. This illustrates another important point related to class design: functionality should usually be assigned to the class that contains the information needed to perform the function. So, to make these two classes more loosely coupled, we ll specify that the listener s fontChanged() method should be passed a reference to a new font that was built using the newly selected properties. The following is an implementation of such an interface: public interface FontListener { public void fontChanged(java.awt.Font newFont); } Next, you ll implement the previous interface in SampleTextFrame and have it update the label s font when it receives a message from the FontPropertiesPanel instance (see Listing 2-3). Listing 2-3. Implementing the FontListener Interface import import import import import java.awt.*; javax.swing.*; javax.swing.border.*; javax.swing.event.*; javax.swing.text.*;

For the examples in this chapter, you will need to add references to your project for the System.Data.dll and System.Data.DataSetExtensions.dll assembly DLLs, if they have not already been added.

public class SampleTextFrame extends JFrame implements FontListener { protected FontPropertiesPanel propertiesPanel; protected JTextField sampleText; protected JLabel displayArea; public static void main(String[] args) { SampleTextFrame stf = new SampleTextFrame(); stf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); stf.setVisible(true); } public SampleTextFrame() { super(); createComponents(); createDocumentListener(); buildLayout(); displayArea.setFont(propertiesPanel.getSelectedFont()); propertiesPanel.setFontListener(this);

To use the LINQ to DataSet operators, add a using directive to the top of your code for the System.Linq and System.Data namespaces if they are not already there: using System.Data; using System.Linq; This will allow your code to find the LINQ to DataSet operators.

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