c# - 共享程序集中属性的 TypeLoadException

Question

11 月 7 日 10:29 MST 更新

奇怪的是，如果我将属性从 ComponentModel 文件夹中移回 Common 项目的根目录，代码就可以正常工作。在为 InflowHealth.Common.ComponentModel 命名空间重构所有引用之后，我无法想象什么可能引用旧命名空间。

这几乎就像有一些引用隐藏在某个地方，而不是基于代码，而是运行时和动态的，但我在查看 InflowHealthErrorContext 的所有查找结果时肯定没有看到它。

11 月 6 日 19:33 MST 更新

有趣的是，当我注释掉使用自定义属性继承路由并使用默认属性的行时，它仍然爆炸了。更有意思的是，它正在寻找的命名空间>.

11 月 6 日 07:42 MST 更新

我相信我已经确定问题与我用来继承操作的另一个自定义属性有关。此属性添加到 HttpConfiguration 中，如下所示:

public static void MapInheritedAttributeRoutes(this HttpConfiguration config)
{
    config.MapHttpAttributeRoutes(new InheritanceDirectRouteProvider());
}

该属性的实现非常简单:

public class InheritanceDirectRouteProvider : DefaultDirectRouteProvider
{
    protected override IReadOnlyList<IDirectRouteFactory> GetActionRouteFactories(HttpActionDescriptor actionDescriptor)
    {
        return actionDescriptor.GetCustomAttributes<IDirectRouteFactory>(true);
    }
}

继承此 InflowHealthErrorContext 属性似乎导致了问题，但我不确定到底是什么问题。我试过:

• 删除 Inherited = false，使其可继承。
• 删除 AllowMultiple = true 只是因为配置错误。

那些没有改变的错误。

---

原帖

我在由几个 Web API 应用程序共享的 Common 程序集中有一个非常简单的属性。就这么简单，我只是想不出是什么导致了这个异常。

I have tried to collect Fusion logs on this, but it's not logging them.

这是属性:

using System;

namespace InflowHealth.Common.ComponentModel
{
    [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
    public sealed class InflowHealthErrorContextAttribute : Attribute
    {
        // This is a positional argument
        public InflowHealthErrorContextAttribute(string errorContext)
        {
            ErrorContext = errorContext;
        }

        public string ErrorContext { get; }
    }
}

这将在路由上使用，以便稍后为过滤器内部完成的自动错误记录提供一些额外的上下文:

[Authorize(Roles = Roles.ALL_ADMINS)]
[Route("api/ControlPanelApi/PayerClassifications")]
[InflowHealthErrorContext("Error getting payer classifications.")]
public IHttpActionResult GetPayerClassifications(int clientId, bool showAllRows)
{
    return Ok(GetData(payerClassificationManager, clientId, showAllRows));
}

加载应用程序时，注册 Web API 路由时失败。这是它打破的线:

GlobalConfiguration.Configure(WebApiConfig.Register);

它抛出这个异常:

Could not load type 'InflowHealth.Common.InflowHealthErrorContextAttribute' from assembly 'InflowHealth.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

这是堆栈跟踪:

   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at 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)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeMethodInfo method, RuntimeType caType, Boolean inherit)
   at System.Reflection.RuntimeMethodInfo.GetCustomAttributes(Type attributeType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(MemberInfo element, Type type, Boolean inherit)
   at System.Attribute.GetCustomAttribute(MemberInfo element, Type attributeType, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttribute[T](MemberInfo element)
   at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.IsValidActionMethod(MethodInfo methodInfo)
   at System.Array.FindAll[T](T[] array, Predicate`1 match)
   at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem..ctor(HttpControllerDescriptor controllerDescriptor)
   at System.Web.Http.Controllers.ApiControllerActionSelector.GetInternalSelector(HttpControllerDescriptor controllerDescriptor)
   at System.Web.Http.Controllers.ApiControllerActionSelector.GetActionMapping(HttpControllerDescriptor controllerDescriptor)
   at System.Web.Http.Routing.AttributeRoutingMapper.AddRouteEntries(SubRouteCollection collector, HttpConfiguration configuration, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<>c__DisplayClass4.<MapAttributeRoutes>b__1()
   at System.Web.Http.Routing.RouteCollectionRoute.EnsureInitialized(Func`1 initializer)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<MapAttributeRoutes>b__0(HttpConfiguration config)
   at System.Web.Http.HttpConfiguration.EnsureInitialized()
   at System.Web.Http.GlobalConfiguration.Configure(Action`1 configurationCallback)
   at InflowHealthPortal.MvcApplication.Application_Start() in Global.asax.cs:line 22

Answer 1

我建议您删除 bin 和 obj 文件夹并重建项目。

当编译项目时有一个杂散的 dll 未被覆盖时，有时会发生此问题。通常在重命名输出文件时。

过去，当引用未反射(reflect)对代码和重新编译所做的更改时，执行上述操作对我有用。

Nuget 包有时也会发生同样的情况，这将导致必须删除包并重新安装它才能引用正确的 dll。