Я пытаюсь вернуть целевой объект из действия контроллера:
[HttpGet("test")]
public async FuncAwaitable<string> GetAsync() => "OK";
Он работает в мастере VS2019, созданном ASP. NET Базовое решение, но не удается с Kestrel:
Проблема где-то в промежуточном программном обеспечении:
ArgumentException
System.ArgumentException: 'this' type cannot be an interface itself.
at System.RuntimeTypeHandle.VerifyInterfaceIsImplemented(RuntimeTypeHandle interfaceHandle)
at System.RuntimeType.GetInterfaceMap(Type ifaceType)
at System.Reflection.RuntimeReflectionExtensions.GetRuntimeInterfaceMap(TypeInfo typeInfo, Type interfaceType)
at Microsoft.Extensions.Internal.AwaitableInfo.IsTypeAwaitable(Type type, AwaitableInfo& awaitableInfo)
at Microsoft.Extensions.Internal.CoercedAwaitableInfo.IsTypeAwaitable(Type type, CoercedAwaitableInfo& info)
at Microsoft.Extensions.Internal.ObjectMethodExecutor..ctor(MethodInfo methodInfo, TypeInfo targetTypeInfo, Object[] parameterDefaultValues)
at Microsoft.Extensions.Internal.ObjectMethodExecutor.Create(MethodInfo methodInfo, TypeInfo targetTypeInfo, Object[] parameterDefaultValues)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvokerCache.GetCachedResult(ControllerContext controllerContext)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvokerProvider.OnProvidersExecuting(ActionInvokerProviderContext context)
at Microsoft.AspNetCore.Mvc.Internal.ActionInvokerFactory.CreateInvoker(ActionContext actionContext)
at Microsoft.AspNetCore.Mvc.Internal.MvcAttributeRouteHandler.<>c__DisplayClass12_0.<RouteAsync>b__0(HttpContext c)
at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
at Shared.AspNetCore.CorrelationHeader.<>c__DisplayClass0_0.<<UseCorrelation>b__0>d.MoveNext() in C:\proj\ah\shared\src\Shared.AspNetCore\AspNetCore\CorrelationHeader.cs:line 16
Есть идеи?