asp.net 核心 2 异常未显示问题所在

Question

我有一个 asp.net coree 2 网络应用程序。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>();

并且在中间件

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，堆栈跟踪总是指向中间件，而不是向我显示问题出在哪里。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：

第一行是更改并显示真正问题的行，这很好：

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

但堆栈跟踪毫无意义

    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 中间件而不是发生错误的页面行

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

感谢陶老师的回答，我想出了一个可能的原因。

问题出在 Startup.cs，在 COnfigureServices:

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

和 LocalizationPipeline：

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

当我删除那条线时，轨迹看起来像：

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 有这个错误。 Version 2.1.0 通过添加 resourceExecutedContext.ExceptionDispatchInfo?.Throw();.

解决了这个问题

Source.

解决方案：

尝试使用来自 Nuget window 的 Version 2.1.2 安装 Microsoft.AspNetCore.Mvc.Core。

解决方法

MiddlewareFilterBuilder 的自定义实现。

添加MiddlewareFilter
添加MiddlewareFilterAttribute
添加MiddlewareFilterBuilder
添加MiddlewareFilterBuilderStartupFilter

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>());
}

asp.net 核心 2 异常未显示问题所在

asp.net core 2 exception not showing where the issue is

stack-trace

asp.net-core-middleware

asp.net-core-2.0