来自Owin依赖的错误的汇编版本

Question

我需要将之前版本为16.1的特定库切换到15.0版。我通过删除更高版本并通过nuget安装更低版本来实现此目的。

构建时，会在bin目录中创建正确的dll（15.0）。但是在启动（web）应用程序时收到以下错误：

    [FileLoadException: Could not load file or assembly 'Microsoft.SharePoint.Client.Runtime, Version=16.1.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
   System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type) +0
   System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext) +145
   System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments) +158
   System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg) +91
   System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent) +438
   System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType) +103
   System.Reflection.RuntimeAssembly.GetCustomAttributes(Boolean inherit) +37
   Owin.Loader.DefaultLoader.SearchForStartupAttribute(String friendlyName, IList`1 errors, Boolean& conflict) +106
   Owin.Loader.DefaultLoader.GetDefaultConfiguration(String friendlyName, IList`1 errors) +46
   Owin.Loader.DefaultLoader.LoadImplementation(String startupName, IList`1 errorDetails) +75
   Owin.Loader.DefaultLoader.Load(String startupName, IList`1 errorDetails) +21
   Microsoft.Owin.Host.SystemWeb.OwinBuilder.GetAppStartup() +115
   Microsoft.Owin.Host.SystemWeb.OwinHttpModule.InitializeBlueprint() +28
   System.Threading.LazyInitializer.EnsureInitializedCore(T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory) +115
   Microsoft.Owin.Host.SystemWeb.OwinHttpModule.Init(HttpApplication context) +106
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +534
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +352
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

对此错误最令人恼火的是Owin-package似乎会导致此错误。但根据NuGet文档，Owin根本不应该引用Microsoft.SharePoint.Client。

或者整个堆栈跟踪误导，Owin不必对此问题做任何事情？

Answer 1

我遇到了同样的问题。 对我来说，通过从bin目录中删除导致错误的.dll来解决问题。 （在我的例子中是Microsoft.Online.Sharepoint.Tentant.dll）

Answer 2

我也遇到了这个问题。可以通过在web.config中指定启动类来规避它，以便Owin不会尝试搜索正确的启动类。

appSetting元素会覆盖OwinStartup属性和命名约定。您可以拥有多个启动类（每个启动类都使用OwinStartup属性）并使用类似于以下内容的标记配置将在配置文件中加载哪个启动类：

<appSettings>  
    <add key="owin:appStartup" value="StartupDemo.ProductionStartup" />
</appSettings>

还可以使用以下键，它明确指定启动类和程序集：

<add key="owin:appStartup" value="StartupDemo.ProductionStartup, StartupDemo" />

进一步的细节可以找到qazxsw poi。