MSBuilds fail from BC2012 error.. Can't open file for writing: Access to the path … is denied.

VSF_TYPE_MARKDOWNI’ve put up with this error for over a year now because I couldn’t fix it but I could work around it. However, now that the error is happening on the Build Server it is essential that I get a remedy. There are a lot of discussions on the forums about this, including mine. None of the recommended solutions have worked for me.

What happens is that when I run a clean-and-build or a rebuild the error happens. However, a subsequent build will work. That’s how I worked around it all that time; I just pressed Ctrl-Shift-B over and over until all the offending errors went away. I can’t do that repetitive build scheme on the build server, so this needs to be addressed.

It only happens with projects that contain xaml files, but not all projects that contain xaml files are affected. It may be due to the first pass of the markup compiler locking the DLL such that the second pass can’t unlock it. There seems to be a correspondence between projects that produce a [[name]_[random]_wpftmp.[proj]](https://developercommunity.visualstudio.com/content/problem/210156/msbuild-is-adding-a-random-hash-and-wpftmp-to-my-a.html) file. It happens in both VS 2017 and VS 2019. I attached a simple single project solution that will reproduce it; just do a **re**build each time. Additionally, the diagnostic build log is attached.

Mark

_This issue has been moved from https://developercommunity.visualstudio.com/content/problem/549296/msbuiilds-fail-from-bc2012-error-cant-open-file-fo.html
VSTS ticketId: 857501_
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