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64. End Sub
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4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 20.
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Private Sub addPerson_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles addPerson.Click Try personList.Items.Add(New Person(personsName.Text)) Catch nameException As NameFormatIncorrectException If Not IsNothing(nameException.InnerException) Then MessageBox.Show(nameException.Message & ControlC hars.CrLf _ & nameException.InnerException.Message) Else MessageBox.Show(nameException.Message) End If Catch ex As Exception MessageBox.Show(ex.Message) End Try personsName.Text = ""
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19. End Sub 21. // Visual C# 22. private void addPerson_Click(object sender, System.EventArgs e ){ 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. } Test the application Press F5 to run the application. Entering a string like Bob Smith in the TextBox correctly adds Smith, Bob to the ListBox. Entering a string like Bob results in a thrown exception. } personsName.Text = ""; } catch (Exception ex) { MessageBox.Show(ex.Message); } } else { MessageBox.Show(nameException.Message); } catch (NameFormatIncorrectException nameException) { if (nameException.InnerException != null) { MessageBox.Show(nameException.Message + "\n" + nameException.InnerException.Message); try { personList.Items.Add(new Person(personsName.Text));
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Quick Reference
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To Declare an event for your control class Do this In Visual Basic, declare the event name and its signature. Public Event CaughtOnFire(ByVal sender As Object, _ ByVal e As CaughtOnFireEventArgs)
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In Visual C#, declare the delegate type of the event, and then declare the delegate of that type. public delegate void CaughtOnFireEventHandler(object sender, CaughtOnFireEventArgs e); public event CaughtOnFireEventHandler CaughtOnFire; Add an event handler using the designer and code editor Visual Basic Declare a class field of the object using the WithEvents keyword. In the Class Name list click the class. In the Method Name list click the event. The event handler is added to the code.
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Add and remove event handlers at run time
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Visual C# In the form designer, select the control. In the Properties window, click the Events button. Double-click the event, and the event handler is added to the code. In Visual Basic, use the AddHandler and RemoveHandler statements. AddHandler newButton.Click, AddressOf newButton_Click RemoveHandler newButton.Click, AddressOf newButton_Click
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In Visual C#, use the += and = operators .newButton.Click += new EventHandler(this.newButton_Click); newButton.Click = new EventHandler(this.newButton_Click); Derive an EventArg s class Create a class that inherits from System.EventArgs, and add the properties to pass information about the event. Visual Basic Public Class CaughtOnFireEventArgs Inherits System.EventArgs End Class // Visual C# public class CaughtOnFireEventArgs : System.EventArgs { } Custom exceptions should derive from the System.Application class, and provide the three constructors. Visual Basic Public Class NewException Inherits System.ApplicationException Public Sub New() MyBase.New() End Sub
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Derive a custom exception class from the Applicati onExceptio n class
Public Sub New(ByVal message As String) MyBase.New(Message)
Do this End Sub Public Sub New(ByVal message As String,_ ByVal innerException As Exception) MyBase.New(message, InnerException) End Sub End Class // Visual C# public class NewException: System.ApplicationException { public NewException () : base() { } public NewException (string message) : base(message) { } public NewException (string message, Exception innerException) : base(message, innerException) { } }
Throw your custom exception
When the code determines that the error condition occurs, throw a new instance of the exception, using one of the three constructors. Visual Basic Throw New NewException("Error text") // Visual C# throw new NewException("Error Message");
Catch your custom exception
Add a catch statement to the try block for the custom exception. Visual Basic Try Normal executionCatch ne As NewException Respond to NewExceptionCatch ex As Exception Respond to all other exceptionsEnd Try // Visual C# try { // Normal execution } catch (NewException ne) { // Respond to NewException } catch (Exception ex) { // Respond to all other exceptions }
8: Putting It All Together with Components
Overview
ESTIMATED TIME 3 hr. 30 min.
In this chapter, you ll learn how to Turn a class into a component. Create a class library.
Select and use a namespace for your control library. Add design-time support for your control and component classes, including Toolbox icons, Properties window categories, and description strings.
In the previous chapters, you learned about the basic constructs of object-oriented programs in the .NET Framework, including fields, properties, methods, constructors, events, and inheritance. You now have a solid basis for designing your object-oriented projects. It s time to use that knowledge to think about how a developer would use the classes you ve created in the Visual Studio .NET development environment. You want to create objects that are easy to use and, when appropriate, can be used by simply dragging them from the Toolbox onto a form. When a developer selects your custom control or component in the form designer, you d like the control s properties to display help text in the Properties window, and you want the control to have its own icon in the Toolbox. In this chapter, you ll write a complete application that uses classes, events, exceptions, and inheritance. You ll design these classes with other developers in mind the developers who will use your classes.
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