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The first screen in the universal installer (shown in Figure 2-14) allows you to install ODAC.NET for the Oracle client or server. The first option is meant to be installed on client machines accessing the Oracle database, while the second option is meant to be installed on the server hosting the Oracle database. In a .NET Winforms application scenario for instance, you might have installed the Oracle database on a server. For each client machine that needs to access the database over the network, you would need to install ODAC for Oracle Client. ODAC for Oracle Client not only installs the ODP.NET libraries necessary but also the Oracle client software necessary for access to the Oracle database. It can therefore be used for installation on a clean machine.

The UnRegister() method, which is called when an empty string is passed to the SetHelpID() method, detaches the event handler and disposes the PictureBox. Private Sub UnRegister(ByVal control As Control) ' Detach event handler. RemoveHandler pictures(control).DoubleClick, AddressOf PicDoubleClick ' Remove the picture from the form. control.Parent.Controls.Remove(pictures(control)) pictures(control).Dispose() pictures.Remove(control) End Sub For good form, you should remove all PictureBox references when the provider is disposed. Of course, you could still get a fair bit more paranoid and perform even more cleanup work, but this is sufficient to keep the HelpIconProvider well behaved.

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Protected Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then ' Dispose all the PictureBox controls. For Each item As KeyValuePair(Of Control, PictureBox) In pictures item.Value.Dispose() Next End If End Sub Last, the GetHelpID() method is as simple as ever it simply retrieves the relevant Help context ID: Public Function GetHelpID(ByVal extendee As Control) As String If contextIDs.ContainsKey(extendee) Then Return contextIDs(extendee) Else Return "" End If End Function When the PictureBox.DoubleClick event occurs, the HelpIcon provider searches for the matching control. Then it launches the Help file with the appropriate context identifier. Public Sub PicDoubleClick(ByVal sender As Object, ByVal e As EventArgs) ' Find the related control. Dim ctrl As Control = Nothing For Each item As KeyValuePair(Of Control, PictureBox) In pictures If item.Value Is sender Then ctrl = item.Key Exit For End If Next ' Show the help. If ctrl IsNot Nothing Then Help.ShowHelp(ctrl, helpFile, HelpNavigator.Topic, _ contextIDs(ctrl)) End If End Sub It s important to note that if you don t have a valid Help file and context identifier, nothing will happen when you double-click the help icon. For this reason, the version of this example included with the code download at www.apress.com uses a message box to let you know the event has been detected. You can find out much more about the Help class this control uses to invoke the Help engine in 23. To invoke this control, just specify a global Help file for the provider and set a Help context ID for a specific control, using either the Properties window or code like this:

Figure 2-14. Selecting the ODAC.NET product to install In the next screen (shown in Figure 2-15), you can select the install location for the ODAC.NET software. You can use the default settings provided.

helpIconProvider1.HelpFile = "myhelp.hlp" helpIconProvider1.SetHelpID(TextBox1, "10001") helpIconProvider1.SetHelpID(TextBox2, "10002") Figure 25-4 shows the HelpIconProvider in action.

CHAPTER 11 LIGHTS, CAMERA, ACTION!

Tip By now, you ve probably recognized that a lot of infrastructure is shared in almost every extender provider. To deal with this in a more elegant way, you could create a base class for extender providers that implements the registration pattern shown in the HelpIconProvider. Then to create a custom provider you would simply need to override the Register() and UnRegister() methods to hook into your desired event, and the CanExtend() method to choose the controls you support. The process of tracking controls and adding them to the collection can be abstracted away, simplifying the model.

The next screen (shown in Figure 2-16) allows you to select or deselect the list of ODAC.NET components to install. Ensure that all the components are selected before proceeding.

In this chapter, you ve taken a look at two extender providers that can add new features to existing controls. The StatusStripHelpLabel allows you to synchronize menu Help text with a status bar, and the HelpIconProvider helps you link to context-sensitive Help with a graphical icon. The important part about both of these controls is that they give you a whole new way to extend the Windows Forms framework. Instead of deriving classes that extend specific controls, you can generically apply a new feature to a range of controls by building a new provider. Best of all, this provider can be dropped into existing projects and will start working immediately, with no control customization required.

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