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27. End Function
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33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. } #endregion
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string result; switch (format.ToUpper()) { case "L" : result = string.Format("({0}, {1})", X, Y); break; case "S" : result = string.Format("{0}:{1}", X, Y); break; default : result = X.ToString(formatProvider) + " " + Y.ToString(formatProvider); break; } return result;
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Overload the ToString method Add two more overloads of ToString so that the SortablePoint class is formatted consistently in all the ToString methods. Each overload calls the ToString method implemented for the IFormattable interface. The default ToString method for the SortablePoint class returns the long version. Visual Basic Public Overrides Function ToString() As String Return Me.ToString("L") End Function Public Function ToString(ByVal format As String) As String Return Me.ToString(format, Nothing) End Function // Visual C# public override string ToString() { return this.ToString("L"); } public string ToString(string format) { return this.ToString(format, null); } Test the IFormattable interface 1. Replace the code in the Click event handler for the Draw button with this code, which creates a few points and then draws them labeled with their coordinates: 2. Visual Basic 3. Private Sub Button1_Click(ByVal sender As System.Object, _ 4. ByVal e As System.EventArgs) Handles Button1.Click 5. Dim points As New SortedPointList() 6. points.AddRandomPoints(5, 200) 7. Dim graph As Graphics = Me.CreateGraphics 8. Dim pt As SortablePoint 9. 10. For Each pt In points
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12. 13. 14. 15. 16. 17. 18. // Visual C# 19. private void button1_Click(object sender, System.EventArgs e) { 20. SortedPointList points = new SortedPointList(); 21. points.AddRandomPoints(5, 200); 22. Graphics graph = this.CreateGraphics(); 23. 24. foreach (SortablePoint pt in points) { 25. graph.FillEllipse(System.Drawing.Brushes.Black, pt.X, pt.Y, 26. 10, 10); 27. string ptlocation = String.Format("{0:L}", pt); 28. graph.DrawString(ptlocation, new Font("Arial", 8), 29. System.Drawing.Brushes.Black, pt.X + 11, pt.Y); 30. } 31. } 32. Press F5 to run the program. Here s an example of the output:
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graph.FillEllipse(System.Drawing.Brushes.Black, pt.X, pt.Y, 10, 10) Dim ptlocation As String = String.Format("{0:L}", pt) graph.DrawString(ptlocation, New Font("Arial", 8), _ System.Drawing.Brushes.Black, pt.X + 11, pt.Y) Next End Sub
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Two Other Uses of Interfaces
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In programming with the .NET Framework, you ll implement interfaces primarily to provide services from your class. You might, in addition, use an interface for a project in the following two situations. Multiple inheritance Classes created in Visual Basic and Visual C# can have only one base class, but they can implement multiple interfaces. Because interfaces behave polymorphically, like base classes, you can use interfaces to simulate multiple inheritance. Suppose you were creating a Backyard class and wanted it to derive from both Lawn and Garden, but Lawn and Garden didn t share a common base class other than System.Object. You could choose to implement an ILawn interface and then implement the ILawn interface in a Lawn class. You then create Garden as a base class. When you create the Backyard class, it inherits from Garden and implements ILawn as you see here: Visual Basic
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Public Class Backyard Inherits Garden Implements ILawn End Class // Visual C# public class Backyard : Garden, ILawn { } It would appear that you haven t gained much from this code because you have to reimplement all the members of ILawn. Fortunately, you can use containment and delegation to reuse some of your work. In the Backyard class, you can create a private instance of the Lawn class. This is containment. You then implement the ILawn methods by calling the corresponding method of the private Lawn instance. This is called delegation. You re delegating the work of the ILawn interface to the contained Lawn member. Suppose the ILawn class has a Grow method and a Height property. Your code might look something like this: Visual Basic Public Class Backyard Inherits Garden Implements ILawn Private m_lawn As New Lawn() Public Sub Grow() Implements ILawn.Grow m_lawn.Grow() End Sub Public Property Height() As Integer Implements ILawn.Height Get Return m_lawn.Height End Get Set(ByVal Value As Integer) m_lawn.Height = Value End Set End Property End Class // Visual C# public class Backyard : Garden, ILawn { private Lawn m_lawn = new Lawn(); #region Implementation of ILawn public void Grow() { m_lawn.Grow(); } public int Height { get { return m_lawn.Height; }
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set { m_lawn.Height = value; } } #endregion } Data views In 3 you created an array of SourceFile classes that you were able to use as a data source in a DataGrid control. In general, you want the data model to fit the data well, and then you want to provide methods to support a user interface. You may also want to limit the amount of control the user interface has over the model. For example, you might not want to allow updates. You can prevent updates by implementing an interface on your class. When you create a reference to the data model for the user interface, you provide only a reference to the interface. You could, of course, provide a reference to the full model, but using an interface can let the compiler do some of the work, alerting you when you re attempting to update data.
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