MSDN Magazine - April 2008 - (Page 26)

Figure 3 Adding My.CustomMyObject Namespace My _ Partial Friend Class MyCustomMyObject Public Sub Foo() End Sub Public Property Bar() End Property End Class _ Friend Module CustomMyObjectModule Private instance As ThreadSafeObjectProvider(Of MyCustomMyObject) ReadOnly Property CustomMyObject() As MyCustomMyObject Get Return instance.GetInstance() End Get End Property End Module End Namespace What if you want to allow your added elements to be accessed via a singleton, just like My.Computer, My.Settings, and My.Application, but you want to create your own? This involves adding a ReadOnly Property to the My namespace using the strategy I introduced at the beginning of this column and then having that Property return the global instance as supplied by the ThreadSafeObjectProvider(Of T) class. Comparing this to the previously mentioned new namespace strategy, this would cause a new instance of the class to be generated on a per-thread basis. Figure 3 shows how you would add a global object called My.CustomMyObject with members named Foo and Bar. Figure 4 shows the resulting IntelliSense experience in the IDE. Miscellaneous My Extension Scenarios Extending My.User is probably the most difficult scenario. It is defined outside of your project, in the Visual Basic runtime DLL, which means you cannot extend it with partial classes. In order to extend My.User, a project-level compilation constant must be defined, which means My.Settings. Partial classes let you that extending My.User requires that the developer add members to a class that is deusing the extension execute this manual step. fined somewhere else as long as the Figure 4 My.CustomMyObject in IntelliSense In any case, if you want code examples and guidsource code for that class exists in the current project. This includes ance for extending My.User, please refer to the aforementioned classes like MyComputer for Visual Basic projects, as the compiler MSDN Magazine article, which also contains information on speinjects the classes automatically before the code is compiled. cialized scenarios, such as expanding My.Application.Log, expand- Advanced Document Imaging Toolkits DotImage 6.0 is now available. New features include Runtime Royalty-Free OCR, PDF annotations, ISIS support, CAD/CAM and WPF viewing, AJAX web image viewing with no plug-ins, and more —Take document and photographic imaging to the .NExT step. Visit Atalasoft.com for web demos and a free trial. Atalasoft, Your .NET Imaging Partner Call us toll free at 866-568-0129 www.atalasoft.com 26 msdnmagazine Basic Instincts http://www.atalasoft.com http://Atalasoft.com

Table of Contents Feed for the Digital Edition of MSDN Magazine - April 2008

MSDN Magazine - April 2008 Contents Toolbox CLR Inside Out Basic Instincts Cutting Edge Foundations Test Run Service Station Windows with C++ Going Places { End Bracket }

MSDN Magazine - April 2008

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