问题
I'm trying to build Unity application for Hololens device on Visual Studio 2017 and I'm getting the following errors:
Metadata file '...\GeneratedProjects\UWP\Assembly-CSharp-firstpass\bin\x86\Release\Assembly-CSharp-firstpass.dll' could not be found
Metadata file '...\GeneratedProjects\UWP\Assembly-CSharp\bin\x86\Release\Assembly-CSharp.dll'
I'm aware of the similar question here but uninstalling and installing the latest versions of both Unity and VS did not help. Neither did starting a completely new project. I'm using now the latest versions of Unity (2017.1.0f3) and Visual Studio 2017 (15.3.0). I've tried uninstalling both applications. Everything was working fine yesterday but then I downloaded additional components to Visual Studio (ASP.NET) and the Hololens build stopped working. Any idea how I could fix the issue?
I can see the Assembly-CSharp-firstpass.dll in Unprocessed folder under the path it's searching for it and even tried to copy it to the correct path but it did not help. I have also tried to build the project without ticking the Unity C# Projects but I get a different error then.
Update
I found this post on Unity forums and I think it's the same issue I have: https://forum.unity3d.com/threads/net-scripting-backend-and-visual-studio-2017-3-incompatibility.487833/
A workaround for this issue is to manually modifiying The "UAP,Version=v10.0.xxx" to "UAP,Version=v10.0" In the project.lock.json files of the GeneratedProjects.
回答1:
Other solutions to this problem include a downgrade to Visual Studio 2015, or using the patch that the link you provided has.
来源：https://stackoverflow.com/questions/45754801/hololens-device-build-fails-to-not-finding-assembly-csharp-firstpass-dll