我有两个库。其中一个使用另一个库，而消费库本身被 Web 应用程序所使用。Web 应用程序返回以下错误，而实例化类型（执行 JWT 签名验证）的代码在两个库的单元测试中都能够成功执行。库和应用程序的目标框架为 .NET 4.5.2，我已验证 Web 应用程序的 .csproj 文件具有有效的引用。
<Reference Include="System.IdentityModel.Tokens.Jwt, Version=5.1.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> <HintPath>..\packages\System.IdentityModel.Tokens.Jwt.5.1.4\lib\net451\System.IdentityModel.Tokens.Jwt.dll</HintPath>
</Reference>
我无法找到GAC中要删除的程序集
C:\Program Files (x86)\Microsoft Visual Studio 11.0>gacutil /u System.IdentityMo
del.Tokens.Jwt
Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.30319.17929
Copyright (c) Microsoft Corporation. All rights reserved.
No assemblies found matching: System.IdentityModel.Tokens.Jwt
Number of assemblies uninstalled = 0
Number of failures = 0
我已经尝试过清理、重建、重启、删除/bin和/lib并重新构建，但是仍然无法解决问题。个人认为这可能不是System.IdentityModel.Tokens.Jwt本身的问题，而是我需要关于类加载错误等故障排除的指导。我已经专门重新安装了.Tokens包以及所有其他包：
nuget install packages.config
我仍然会出现错误，不是在构建时，而是只有在执行时才会出现：
Server Error in '/' Application.
Could not load type 'System.IdentityModel.Tokens.JwtSecurityToken' from assembly 'System.IdentityModel.Tokens.Jwt, Version=5.1.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.TypeLoadException: Could not load type 'System.IdentityModel.Tokens.JwtSecurityToken' from assembly 'System.IdentityModel.Tokens.Jwt, Version=5.1.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
Source Error:
Line 12: protected void Application_Start(object sender, EventArgs e)
Line 13: {
Line 14: GlobalConfiguration.Configure(WebApiConfig.Register);
Line 15: }
Line 16:
Source File: C:\Dev\Git\Connect-Applications\ControllerlessApp\src\Connect.Rest.MainApp\Global.asax.cs Line: 14
Stack Trace:
[TypeLoadException: Could not load type 'System.IdentityModel.Tokens.JwtSecurityToken' from assembly 'System.IdentityModel.Tokens.Jwt, Version=5.1.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.]
System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes) +0
System.Reflection.RuntimeAssembly.GetExportedTypes() +31
Plex.Web.UI.ServiceResolverDefaults..ctor() +842
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +138
System.Activator.CreateInstance(Type type, Boolean nonPublic) +105
System.Activator.CreateInstance(Type type) +12
Plex.Activation.AssemblyDefaultRegistrationConvention.Process(Type type, Registry registry) +118
StructureMap.StringExtensions.Each(IEnumerable`1 enumerable, Action`1 action) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Extensions.cs:10
StructureMap.StringExtensions.Each(IEnumerable`1 enumerable, Action`1 action) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Extensions.cs:10
StructureMap.Graph.AssemblyScanner.ScanForAll(PluginGraph pluginGraph) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Graph\AssemblyScanner.cs:248
StructureMap.Graph.PluginGraph.Seal() in c:\BuildAgent\work\767273992e840853\src\StructureMap\Graph\PluginGraph.cs:121
StructureMap.PluginGraphBuilder.Build() in c:\BuildAgent\work\767273992e840853\src\StructureMap\PluginGraphBuilder.cs:72
StructureMap.Container..ctor(Action`1 action) in c:\BuildAgent\work\767273992e840853\src\StructureMap\Container.cs:25
Plex.Activation.ServiceResolverBuilder.Initialize(ApplicationContext context) +288
Connect.Rest.Framework.Hosting2.Infrastructure.AppDomainSharedServices.get_ServiceResolver() +1373
Connect.Rest.Framework.Hosting2.WebApiConfig.Register(HttpConfiguration config) +80
System.Web.Http.GlobalConfiguration.Configure(Action`1 configurationCallback) +63
Connect.Rest.MainApp.WebApiApplication.Application_Start(Object sender, EventArgs e) in C:\Dev\Git\Connect-Applications\ControllerlessApp\src\Connect.Rest.MainApp\Global.asax.cs:14
[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +544
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +186
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +402
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +343
[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +579
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +112
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +716
System.IdentityModel.Tokens.Jwt。在我的情况下，我不能只降级到 v4，因为我有其他依赖项需要 v5，这非常令人恼火。 - Nicholas J. Markkula