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CHAPTER 13 PUBLISHING WEB APPLICATIONS IN .NET
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Without this attribute, the methods are not called, and your installer class is simply ignored. You also needed to pass arguments to your class, namely the folder to which the user chose to install the database. Instead of using the Arguments property as you did for the console application, you use the CustomActionData property. It s a simple string with the following format: /name1=value1 /name2=value2 ... /nameN=valueN For the values, you can use the usual notation for referring to properties collected by the installation wizard that is, the property name enclosed in square brackets: /db=[DBPATH]. These values are converted to a collection of key/value pairs that is accessible through the Context.Parameters property of the base Installer class: Public Overrides Sub Install(ByVal stateSaver As IDictionary) ... Dim patharg As String = MyBase.Context.Parameters("db") One thing to note here is that the pair name (which becomes the key into the Parameters collection) is always converted to lowercase. There s one caveat to the uninstallation process implemented this way. All file copying (and subsequent deleting) is done prior to custom actions execution. This means that when the MSI file tries to remove the database files, they will be locked if the database is in use, because the custom action that detaches it hasn t run yet. Therefore, the service must be stopped in order for file removal to succeed. However, in order to detach the database (the custom action that executes after file deletion), you need the service running, so the user will need to first stop the service to initiate uninstallation, and restart it when you warn the user about it through your custom action (the MessageBox.Show() call in the code). You could avoid this inconvenience by starting the service yourself, but it s not a trivial task, because the SQL Server/MSDE service may have different names, and you may need to use a technology called WMI (Windows Management Instrumentation) to achieve it in a reliable way. You can read more about WMI at http://msdn.microsoft.com/library/en-us/ wmisdk/wmi/wmi_start_page.asp.
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Creating an Event Source to Initiate Windows Event Logging
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Back in 11, you set up the logging of application errors in the Windows System event log. You learned that each application that logs events in the event log has its own event source, and that this event source must exist prior to the first log request from an ASP .NET application. This is due to security permissions related to creating a new event source. We used a workaround, but we said we would solve that at installation time. Now is the time to create the event source. We ll also need to arrange for it to be deleted if the application is uninstalled. Try It Out: Manage Event Sources You ll add a new installer class that will handle the event source creation and deletion. 1. Add a new class to the FriendsReunionInstaller project called EventLogInstaller, and then add the following using statements: Imports System.Collection Imports System.Configuration.Install Imports System.Diagnostics
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CHAPTER 13 PUBLISHING WEB APPLICATIONS IN .NET
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2. Add the RunInstaller attribute to the class and make it inherit from Installer: <System.ComponentModel.RunInstaller(True)> _ Public Class EventLogInstaller Inherits Installer 3. Add the following method overrides: Public Overrides Sub Install(ByVal stateSaver As IDictionary) MyBase.Install(stateSaver) Try EventLog.CreateEventSource("FriendsReunion", "Application") Catch ex As ArgumentException Context.LogMessage(ex.Message) End Try End Sub Public Overrides Sub Uninstall(ByVal savedState As IDictionary) EventLog.DeleteEventSource("FriendsReunion") MyBase.Uninstall(savedState) End Sub
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How It Works This simple installer class creates the event source named FriendsReunion you use in the Global.asax.vb error handler: Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs) System.Diagnostics.EventLog.WriteEntry("FriendsReunion", _ Server.GetLastError().InnerException.ToString(), _ System.Diagnostics.EventLogEntryType.Error) End Sub This time, the event source will already exist when an error is logged. Notice that you also chose the Application log. This is one of the standard logs supported in the Event Viewer. You can also pick Security, System, or a log with a custom name. Additionally, we catch ArgumentException exceptions and log them, which will be thrown if the event source already exists (which is the case in your machine now).
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