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.net 8 Intermittent build issues (System.ArgumentException: An item with the same key has already)

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npateman		#1 Posted : Wednesday, August 20, 2025 9:23:44 AM(UTC)
Rank: Newbie Groups: Registered Joined: 7/1/2022(UTC) Posts: 8 Location: United Kingdom Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Hi there, My unit test project is intermittently failing to build by NCrunch with the following error, C:\Program Files\dotnet\sdk\8.0.413\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets: The "GenerateDepsFile" task failed unexpectedly. System.ArgumentException: An item with the same key has already been added. Key: clypse.core.UnitTests at System.Collections.Generic.CollectionExtensions.LibraryCollectionToDictionary[T](IReadOnlyList`1 collection) at Microsoft.Extensions.DependencyModel.DependencyContextWriter.WritePortableTarget(String key, IReadOnlyList`1 runtimeLibraries, IReadOnlyList`1 compilationLibraries, Utf8JsonWriter jsonWriter) at Microsoft.Extensions.DependencyModel.DependencyContextWriter.WriteTargets(DependencyContext context, Utf8JsonWriter jsonWriter) at Microsoft.Extensions.DependencyModel.DependencyContextWriter.Write(DependencyContext context, Stream stream) at Microsoft.NET.Build.Tasks.GenerateDepsFile.WriteDepsFile(String depsFilePath) at Microsoft.NET.Build.Tasks.TaskBase.Execute() at Microsoft.NET.Build.Tasks.TaskWithAssemblyResolveHooks.Execute() at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() I can fix it temporarily by closing visual studio. deleting obj and bin folders, then loading up again. But then a few changes later it's back again. My version isn't the latest (5.11.0.1). I looked through the forum and found some old mentions about it but nothing new (unless I completely missed it) Is this something that is addressed with a newer release or is there some kind of workaround? Btw my solution consists of 2 projects, clypse.core clypse.core.UnitTests Nick.
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Remco		#2 Posted : Wednesday, August 20, 2025 10:00:26 AM(UTC)
Rank: NCrunch Developer Groups: Administrators Joined: 4/16/2011(UTC) Posts: 7,349 Thanks: 994 times Was thanked: 1337 time(s) in 1240 post(s)		Hi Nick, Thanks for sharing this issue. This looks to be a downstream symptom of a project referencing issue, and it feels familiar to me. I remember having fixed something like it in a recent build. I'd like to confirm whether this is a new issue. I've added a short trial license to your account on this website that you can use to unlock access to the latest version of NCrunch temporarily. Would you mind giving it a try to see if it resolves the issue?
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npateman		#3 Posted : Wednesday, August 20, 2025 10:10:26 AM(UTC)
Rank: Newbie Groups: Registered Joined: 7/1/2022(UTC) Posts: 8 Location: United Kingdom Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		Hi there, Not entirely sure if it's new tbh, I've not done any personal .net 8 projects for a while. It's not something I've noticed at work that's for sure, so could well be something funky with my project. It's pretty vanilla, .net 8 class library and xunit test project. Sure I'll give the new one a try and see how it goes... Nick.
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npateman		#4 Posted : Wednesday, August 20, 2025 10:37:25 AM(UTC)
Rank: Newbie Groups: Registered Joined: 7/1/2022(UTC) Posts: 8 Location: United Kingdom Thanks: 1 times Was thanked: 1 time(s) in 1 post(s)		I just made a whole bunch of changes and the tests continued to work as expected, so looks like it's my dated build. Thanks for confirming that, I will upgrade to get the latest version. Nick.
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1 user thanked npateman for this useful post.		Remco on 8/20/2025(UTC)
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