不可收集的程序集可能不引用可收集的程序集

Question

我试图将 .Net Core 控制台应用程序和测试从 2.1 迁移到 3.1，但在我的测试中遇到了问题。我正在使用Moq 库，它工作正常。迁移后，我在尝试访问任何模拟对象时开始收到A non-collectible assembly may not reference a collectible assembly。我在全新的项目中重现了相同的行为。我无法找到有关此主题的任何相关信息。我已经用MSTest 和Xunit 对其进行了测试。这是Moq 库问题还是.Net Core 3.1 应该对这种情况使用不同的方法？

using Moq;
using Xunit;

namespace NetCore3.Tests
{
    public interface IMyInterface{ }
    
    public class UnitTest
    {
        [Fact]
        public void Test()
        {
            var mock = new Mock<IMyInterface>();
            var tmp = mock.Object; // this line throwing exception
        }
    }
}

例外：

NetCore3.Tests.UnitTest.Test

System.NotSupportedException: A non-collectible assembly may not reference a collectible assembly.

System.NotSupportedException
A non-collectible assembly may not reference a collectible assembly.
   at System.Reflection.Emit.ModuleBuilder.GetTypeRef(QCallModule module, String strFullName, QCallModule refedModule, String strRefedModuleFileName, Int32 tkResolution)
   at System.Reflection.Emit.ModuleBuilder.GetTypeRefNested(Type type, Module refedModule, String strRefedModuleFileName)
   at System.Reflection.Emit.ModuleBuilder.GetTypeTokenWorkerNoLock(Type type, Boolean getGenericDefinition)
   at System.Reflection.Emit.ModuleBuilder.GetTypeTokenInternal(Type type, Boolean getGenericDefinition)
   at System.Reflection.Emit.TypeBuilder.AddInterfaceImplementation(Type interfaceType)
   at Castle.DynamicProxy.Generators.Emitters.ClassEmitter..ctor(ModuleScope modulescope, String name, Type baseType, IEnumerable`1 interfaces, TypeAttributes flags, Boolean forceUnsigned)
   at Castle.DynamicProxy.Generators.BaseProxyGenerator.BuildClassEmitter(String typeName, Type parentType, IEnumerable`1 interfaces)
   at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.Init(String typeName, ClassEmitter& emitter, Type proxyTargetType, FieldReference& interceptorsField, IEnumerable`1 interfaces)
   at Castle.DynamicProxy.Generators.InterfaceProxyWithoutTargetGenerator.GenerateType(String typeName, Type proxyTargetType, Type[] interfaces, INamingScope namingScope)
   at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.<>c__DisplayClass6_0.<GenerateCode>b__0(String n, INamingScope s)
   at Castle.Core.Internal.SynchronizedDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Castle.DynamicProxy.Generators.BaseProxyGenerator.ObtainProxyType(CacheKey cacheKey, Func`3 factory)
   at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors)
   at Moq.Mock`1.InitializeInstance()
   at Moq.Mock`1.OnGetObject()
   at Moq.Mock`1.get_Object()
   at NetCore3.Tests.UnitTest.Test() in C:\Work\NetCore3\NetCore3.Tests\UnitTest1.cs:line 14

项目文件：

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFramework>netcoreapp3.1</TargetFramework>
        <IsPackable>false</IsPackable>
    </PropertyGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
        <PackageReference Include="Moq" Version="4.14.5" />
        <PackageReference Include="xunit" Version="2.4.1" />
        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2"/>
        <PackageReference Include="coverlet.collector" Version="1.3.0"/>
    </ItemGroup>
</Project>

Answer 1

为了其他人从谷歌登陆这个......

我们正在使用最新的 Rider/ReSharper EAP (2020.2 EAP 8)，它在以下情况下引入了此错误：

• 通过 Rider/ReSharper 测试运行程序运行测试
• 测试项目引用并使用了一个模拟库，该库尝试生成动态代理（Moq、NSubstitute 等...）

JetBrains 在其开发分支中已修复此问题，并将在下一个 EAP 中修复。你可以在这里追踪：https://youtrack.jetbrains.com/issue/RIDER-48134

更新：EAP 9 已发布，可修复此问题? 您可以使用 JetBrains Toolbox 进行更新。