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We’ll go through some solutions to the problem of building a single instance application in WPF, like Firefox. This means running your application again will not create a new instance but instead just pass any arguments to the current instance.
By default, it comes up with two main items in the solution – "Window1.xaml" (which I renamed to ExampleWindow.xaml") and "App.xaml". Both of these also have their respective code behind files. So first off, do something you have probably never done before – delete "App.xaml" and "App.xaml.cs". We won’t be needing them, because we will be doing our own Application creation.
Now create a new class (I called it "ExampleApplcation"). This will be our application. The two main pieces of logic that this class needs to have are for showing the main window and for processing command line arguments. The first piece will only happen once – the initial application start up. The second, however, will happen every time a user tries to run the app (and we will see how that works in a moment).
Read more: http://www.switchonthecode.com/tutorials/wpf-writing-a-single-instance-application
Some .Net applications are required to run as single instance process (at startup, each process “ensures” that he’s unique). This requirement may come from licensing issues, technical and/or other reasons. Quick search in Google will provide a variety of solutions, most of them are based on WindowsFormsApplicationBase object from VB.Net, usage of Mutex object and other techniques. I don’t like mixing VB with C#, and also Win-Forms solution isn’t “pure” enough for WPF applications. So I wrote my version of “Single Instance Manager”…
This post will provide short description about this small project and links to download the sources.
The manager uses well-known ThreadPool object with WaitEventHandle object and IpcClientChannel to pass messages (objects) between processes (.Net Remoting).
http://blogs.microsoft.co.il/blogs/maxim/archive/2010/02/13/single-instance-application-manager.aspx
Project Description
It is made by means of Threads synchronization model.
I used EventWaitHandle Class.
http://wpfsingleinstance.codeplex.com/releases/view/20316
http://rrelyea.spaces.live.com/blog/cns!167AD7A5AB58D5FE!1834.entry – More Links
http://msdn2.microsoft.com/en-us/library/ms771662.aspx – MSDN
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