BCrypt version 4.0.2 and System.Runtime.CompilerServices.Runtime 4.7.1 compatibility issue

My team is using BCrypt version 4.0.2 and we’ve to use v4.7.1 of System.Runtime.CompilerServices.Unsafe due to another (transitive) dependency.

At runtime, we see the following error when invoking the BCrypt.Net.BCrypt.HashPassword(String inputKey, String salt, Boolean enhancedEntropy, HashType hashType) method.

[16:54:50]F:			 [MM.Core.NUnitTests.UnitTests.BusinessLayerTests.HelperTests.PasswordHashingHelperTests.GenerateHash_given_password_and_salt_returns_hashed_value] System.IO.FileLoadException : Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
[16:54:50]F:			 [MM.Core.NUnitTests.UnitTests.BusinessLayerTests.HelperTests.PasswordHashingHelperTests.GenerateHash_given_password_and_salt_returns_hashed_value]    at System.ReadOnlySpan`1..ctor(T[] array)
   at System.ReadOnlySpan`1.op_Implicit(T[] array)
   at BCrypt.Net.BCrypt.HashPassword(String inputKey, String salt, Boolean enhancedEntropy, HashType hashType) in I:\bcrypt.net\src\BCrypt.Net\BCrypt.cs:line 669
   at MM.Core.BusinessLayer.Helpers.PasswordHashingHelper.GenerateHash(String password, String salt) in C:\BuildAgent\work\50ad46f03ff53e94\Core\BusinessLayer\Helpers\PasswordHashingHelper.cs:line 23
   at MM.Core.NUnitTests.UnitTests.BusinessLayerTests.HelperTests.PasswordHashingHelperTests.GenerateHash_given_password_and_salt_returns_hashed_value() in C:\BuildAgent\work\50ad46f03ff53e94\Core\NUnitTests\UnitTests\BusinessLayerTests\HelperTests\PasswordHashingHelperTests.cs:line 69

(Assembly) version 4.0.4.1 is part of System.Runtime.CompilerServices.Unsafe v4.5.3, I believe.

According to Nuget v4.0.2 documentation, it depends on System.Memory >= v4.5.4 which in turn depends on System.Runtime.CompilerServices.Unsafe >= 4.5.4. This means it should work with v4.7.1, but doesn’t seem to.

Has version 4.0.2 BCrypt been tested with version 4.7.1 of System.Runtime.CompilerServices.Unsafe?

[ChrisMcKee]

I switched to xunit when nunit stagnated (post .net core launch after DNX); .net assembly binding is my endless hell 😆

[jijoe]

So it turns out this problem we caused by use of Nunit 3 runner for our unit tests step in TeamCity builds. Switching to vstest for unit test step fixed this problem for us.