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Occasionally, novice ADO.NET developers make the mistake of assuming that the DataSet should contain all the information from a given table in the data source. This is not the case. For performance reasons, you will generally use the DataSet to work with a small subset of the total information in the data source. Also, the tables in the DataSet do not need to map directly to tables in the data source. A single table can hold the results of a query on one table, or it can hold the results of a JOIN query that combines data from more than one linked table.

Octagon oct = new Octagon(); // We now must use casting to access the Draw() // members. IDrawToForm itfForm = (IDrawToForm)oct; itfForm.Draw(); // Shorthand notation if you don't need // the interface variable for later use. ((IDrawToPrinter)oct).Draw(); // Could also use the "as" keyword. if(oct is IDrawToMemory) ((IDrawToMemory)oct).Draw(); Console.ReadLine(); } While this syntax is quite helpful when you need to resolve name clashes, you can use explicit interface implementation simply to hide more advanced members from the object level. In this way, when the object user applies the dot operator, he or she will see only a subset of the type s overall functionality. However, those who require the more advanced behaviors can extract out the desired interface via an explicit cast.

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As you can see in Figure 8-3, each record is represented as a DataRow object. To manage disconnected changes, the DataSet tracks versioning information for every DataRow. When you edit the value in a row, the original value is kept in memory, and the row is marked as changed. When you add or delete a row, the row is marked as added or deleted. Always remember that the data in the data source is not touched at all when you work with the DataSet objects. Instead, all the changes are made locally to the DataSet in memory. The DataSet never retains any type of connection to a data source. If you want to extract records from a database and use them to fill a table in a DataSet, you need to use another ADO.NET object: a DataAdapter. The DataAdapter also allows you to update the data source according to the changes you make in the DataSet (although direct commands are a preferred approach to updating in ASP.NET). The DataSet also has methods that can write and read XML data and schemas and has methods you can use to quickly clear and duplicate data. Table 8-1 outlines these methods. You ll learn more about XML in 12.

Interfaces can be arranged in an interface hierarchy. Like a class hierarchy, when an interface extends an existing interface, it inherits the abstract members defined by the parent(s). Of course, unlike classbased inheritance, derived interfaces never inherit true implementation. Rather, a derived interface simply extends its own definition with additional abstract members. Interface hierarchies can be useful when you wish to extend the functionality of an existing interface without breaking existing code bases. To illustrate, create a new Console Application named InterfaceHierarchy. Now, let s design a new set of rendering-centric interfaces such that IDrawable is the root of the family tree: public interface IDrawable { void Draw(); } Given that IDrawable defines a basic drawing behavior, we could now create a derived interface that extends this interface with the ability to render in modified formats, for example: public interface IAdvancedDraw : IDrawable { void DrawInBoundingBox(int top, int left, int bottom, int right);

this.myInkCanvas.Strokes = strokes; } } private void Clear(object sender, System.Windows.RoutedEventArgs e) { // Clear all strokes. this.myInkCanvas.Strokes.Clear(); } You should now be able to save your data to a file, load it from the file, and clear the InkCanvas of all data. That wraps up the first tab of the TabControl, as well as your examination of the WPF digital Ink API. To be sure, there is more to say about this technology; however, you should be in a good position to dig into the topic further if that interests you. Next, you will learn how to use the WPF Documents API.

GetXml() and GetXmlSchema()

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