asp.net core 2 异常未显示问题所在

Question

我有一个 asp.net coree 2 web 应用程序。我使用中间件过滤器，因为它是一个多租户应用程序。

app.UseMiddleware<TenantMiddleware>();

在中间件中

public class TenantMiddleware
{
    private readonly RequestDelegate _next;

    public TenantMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext httpContext) 
    { 
        ... 
        await _next.Invoke(httpContext);
    }
}

问题是，当我遇到异常时，堆栈跟踪总是引用中间件，而不是告诉我问题出在哪里。如果我删除中间件，异常跟踪会告诉我发生异常的确切行，但对于中间件，它始终是相同的跟踪：

第一行是改变并显示真正问题的那一行，这很好：

NullReferenceException: Object reference not set to an instance of an object.

但是堆栈跟踪是没有意义的

    Microsoft.AspNetCore.Mvc.Internal.MiddlewareFilterBuilder+<>c+<<BuildPipeline>b__8_0>d.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware+<Invoke>d__4.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeNextResourceFilter>d__22.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeFilterPipelineAsync>d__17.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeAsync>d__15.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Builder.RouterMiddleware+<Invoke>d__4.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
MyWebApp.Web.AppConfig.TenantMiddleware+<Invoke>d__3.MoveNext() in Tenant.cs
+
            await _next.Invoke(httpContext);
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__7.MoveNext()

始终显示 Tenent 中间件，而不是出现错误的页面行

MyWebApp.Web.AppConfig.TenantMiddleware+<Invoke>d__3.MoveNext() in Tenant.cs
+
            await _next.Invoke(httpContext);

有没有办法让堆栈跟踪指向发生错误的页面？

谢谢。

更新

感谢Tao的回答，我想出了一个可能的原因。

问题出在 Startup.cs 中，在 CConfigureServices 中：

services.AddMvc(options =>
{
    options.Filters.Add(new MiddlewareFilterAttribute(typeof(LocalizationPipeline)));
});

还有 LocalizationPipeline：

public class LocalizationPipeline
{
    public void Configure(IApplicationBuilder appBuilder, RequestLocalizationOptions options)
    {
        appBuilder.UseRequestLocalization(options);
    }
}

当我删除该行时，跟踪看起来像：

DivideByZeroException: Attempted to divide by zero.
MyWebApp.Web.Controllers.TestController.Index() in TestController.cs
+
            var c = b / a;
lambda_method(Closure , object , Object[] )
Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(object target, Object[] parameters)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeActionMethodAsync>d__12.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeNextActionFilterAsync>d__10.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker+<InvokeInnerFilterAsync>d__14.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeNextResourceFilter>d__22.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeFilterPipelineAsync>d__17.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker+<InvokeAsync>d__15.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Builder.RouterMiddleware+<Invoke>d__4.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6.MoveNext()
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
MyWebApp.Web.AppConfig.TenantMiddleware+<Invoke>d__3.MoveNext() in Tenant.cs
+
            await _next.Invoke(httpContext);
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware+<Invoke>d__7.MoveNext()

知道为什么要从跟踪中删除所有信息吗？任何可能的解决方案？

Answer 1

这个问题是由MiddlewareFilterBuilder引起的。

对于Asp.Net Core 2.0 项目，Microsoft.AspNetCore.Mvc.Core 是Version 2.0.4，它有这个错误。 Version 2.1.0 已通过添加 resourceExecutedContext.ExceptionDispatchInfo?.Throw();. 修复此问题

Source.

解决办法：

尝试从 Nuget 窗口安装 Microsoft.AspNetCore.Mvc.Core 和 Version 2.1.2。

解决方法

MiddlewareFilterBuilder 的自定义实现。

1. 添加MiddlewareFilter
2. 添加MiddlewareFilterAttribute
3. 添加MiddlewareFilterBuilder
4. 添加MiddlewareFilterBuilderStartupFilter

5. 修改Startup.csConfigureService

       public void ConfigureServices(IServiceCollection services)
   {
       services.AddMvc(options =>
       {
           options.Filters.Add(new MiddlewareFilterAttribute(typeof(LocalizationPipeline)));
       });
       services.AddSingleton<RequestLocalizationOptions>();
       services.AddSingleton<MiddlewareFilterBuilder>();
       services.Add(ServiceDescriptor.Singleton<IStartupFilter, MiddlewareFilterBuilderStartupFilter>());
   }