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You can store global application variables in one other way. You can add Shared member variables to the global.asax file (which was introduced in 5). These members are then compiled into the custom HttpApplication class for your web application and made available to all pages. Here s an example: Public Shared fileList as String() The key detail that allows this to work is that the variable is Shared. That s because ASP.NET creates a pool of HttpApplication classes to serve multiple requests. As a result, each request might be served with a different HttpApplication object, and each HttpApplication object has its own instance data. However, only one copy of the shared data exists, which is shared for all instances. Another requirement is that you must supply the ClassName attribute in the Application directive. This assigns a name to the global application class, which you ll need to use to retrieve the Shared value you ve just created. Of course, for the best encapsulation (and the most flexibility), you should use property procedures: Private Shared strFileListAs String() Public Shared ReadOnly Property FileList() As String() Get Return strFileList End Get End Property

The previous sections showed you the foundation for the main class, SpaceBlasterGame. Here is where all the meat resides. Let s take a closer look at the most important sections of SpaceBlaster.java. Note that the class has been stripped for simplicity in Listing 3-5, but the chapter source contains the full implementation.

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When you add a member variable to the globalasax file, it has essentially the same characteristics as a value in the Application collection In other words, you can use any NET data type, the value is retained until the application domain is restarted, and state isn t shared across computers in a web farm However, there s no automatic locking Because multiple clients might try to access or modify a value at the same time, you should use the SyncLock statement to temporarily restrict the variable to a single thread Depending on how your data is accessed, you might perform the locking in the web page (in which case you could perform several tasks at once with the locked data) or in the property procedures or methods in the globalasax file (in which case the lock would be held for the shortest possible time).

Here s an example of property procedure that maintains a thread-safe global collection of metadata: Private Shared metadata As New Dictionary(Of String, String)() Public Sub AddMetadata(ByVal key As String, ByVal value As String) SyncLock metadata metadata(key) = value End SyncLock End Sub Public Function GetMetadata(ByVal key As String) As String SyncLock metadata Return metadata(key) End SyncLock End Function Using Shared member variables instead of the Application collection has two advantages First, it allows you to write custom code in a property procedure You could use this code to log how many times a value is being accessed to check whether the data is still valid or to re-create it Here s an example that uses a lazy initialization pattern and creates the global object only when it s first requested: Private Shared strFileListAs String() Public Shared ReadOnly Property FileList() As String() Get If strFileListIs Nothing Then strFileList= DirectoryGetFiles(HttpContextCurrent.

Note Latitude is the number of degrees north or south of the equator and ranges from 90 (South Pole)

RequestPhysicalApplicationPath) End If Return strFileList End Get End Property This example uses the file access classes described in 13 to retrieve a list of files in the web application This approach wouldn t be possible with the Application collection The other benefit of using Shared member variables is that the code that consumes them can be type-safe Here s an example that uses the FileList property: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Dim builder As New StringBuilder() For Each file As String In GlobalFileList builderAppend(file & "<br />") Next lblInfoText = builderToString() End Sub Notice that no casting step is required to gain access to the custom property you ve added..

An XML fragment contains valid XML syntax, but isn t necessarily a valid document of its own. Usually, this is because there is no root element. An XML document requires all elements to be nested in a single root element.

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