asp.net 核心 2 异常未显示问题所在

Question

我有一个 asp.net 的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>();

而在中间件中

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，而不是向我显示问题所在。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.

但是堆栈跟踪毫无意义

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);

有没有办法将堆栈跟踪引用到发生错误的页面？

谢谢。

更新

多亏了陶的回答，我想出了一个可能的原因。

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

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

和本地化管道：

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

当我删除该行时，跟踪如下所示：

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？有什么可能的解决方案吗？

Answer 1

对于此问题，它是由MiddlewareFilterBuilder引起的。

对于Asp.Net Core 2.0项目，Microsoft.AspNetCore.Mvc.CoreVersion 2.0.4具有此错误。此问题已通过添加resourceExecutedContext.ExceptionDispatchInfo?.Throw();.Version 2.1.0修复

源。

溶液：

尝试从 Nuget 窗口安装带有Version 2.1.2的Microsoft.AspNetCore.Mvc.Core。

解决方法

MiddlewareFilterBuilder的自定义实现 .

1. 添加中间件筛选器
2. 添加中间件过滤器属性
3. 添加中间件过滤器生成器
4. 添加中间件筛选器生成器启动筛选器

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>());
   }