C# programs only allow one instance to run the correct code

Little scum · Posted on 12/10/2016 2:55:50 PM

I wrote a traffic monitoring software that I want the computer to run only once, and the code is as follows:

Find, immediately, click on the software, it will prompt "An instance has been run", but,After waiting for 30 seconds, then click on the software, and it runs successfully againOnce !!

It's a pity.The above code is fine in DEBUG mode, but it doesn't work in RELEASE.
The problem is that Mutex is declared as a local variable, and in relese mode due to optimization issues, possibly because the compiler thinks Mutex is no longer used

used, recycled, tested by myself,

Put Mutex on top and set it as a static variable to !!!RightThe code is as follows:

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Little scum · Posted on 12/10/2016 3:02:58 PM

Static fields are not recycled by the GC, static fields are allocated in the Loader heap, non-GC heap, and are not controlled by the GC.

Static members (of static classes or not) are only recycled when they reach AppDomain.UnLoad. Static classes are only allowed to have static members

Five flavors of life · Posted on 12/6/2017 11:48:05 AM

Learned, thank you for sharing

Little scum · Posted on 2/23/2018 2:59:01 PM

Other implementations:

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Startup method:

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Little scum · Posted on 10/3/2025 4:10:11 PM

.NET/C# implements program singleton based on Mutex and MemoryMappedFile
https://www.itsvse.com/thread-10808-1-1.html

[Source] C# programs only allow one instance to run the correct code

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