DotNetCore 3.1全局错误处理，未调用中间件

Question

我正在尝试在.Net Core 3.1 webpai 中设置全局异常处理代码

我的目标是在应用程序退出之前，使用log4net记录未处理的异常。

我试着遵循了几个教程，一个使用过滤器，还有几个使用中间件，当我完成并测试它时，当我抛出异常时，中间件永远不会被调用。

我已经有了一个过滤器(为了测试中间软件，以防它们交互(，它确实有效，但不能使用IOC加载ILogger 的instenve

[HttpGet]
[Route( "/ThrowException" )]
public JqGridReturnCV ThrowException()
{
log.LogTrace( "AdStudentController::ThrowException() - in" );
throw new Exception( "This is a test Exception" );
log.LogTrace( "AdStudentController::ThrowException() - out" );
}

这是我的中间件代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using log4net;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using StudentPortal4Api.Dto;
namespace StudentPortal4Api.Utilities
{
public class GlobalExceptionMiddleware
{
private readonly RequestDelegate next;
public readonly  ILogger         log;
public GlobalExceptionMiddleware( RequestDelegate _next, ILogger _log )
{
next = _next;
log = _log;
}
public async Task Invoke( HttpContext context )
{
try
{
await next( context );
}
catch ( Exception ex )
{
var response = context.Response;
response.ContentType = "application/json";
switch ( ex )
{

default:
// unhandled error
log.Log( LogLevel.Error, " GlobalException:" + ex.ToString() ); 
break;
}
throw;
}
}
}
public class ErrorDetails
{
public int    StatusCode { get; set; }
public string Message    { get; set; }
public override string ToString()
{
return JsonConvert.SerializeObject( this );
}
}
public static class ExceptionMiddlewareExtensions
{
public static void ConfigureExceptionHandler( this IApplicationBuilder app, ILogger logger )
{
app.UseExceptionHandler( appError =>
{
appError.Run( async context =>
{
context.Response.StatusCode  = (int) HttpStatusCode.InternalServerError;
context.Response.ContentType = "application/json";
var contextFeature = context.Features.Get<IExceptionHandlerFeature>();
if ( contextFeature != null )
{
logger.LogError( $"Something went wrong: {contextFeature.Error}" );
await context.Response.WriteAsync( new ErrorDetails()
                                {
                                    StatusCode = context.Response.StatusCode,
                                    Message    = "Internal Server Error."
                                }.ToString() );
}
} );
} );
}
}
}

这是我的配置方法，我怀疑我在注册时做错了什么

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure( IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory, ILogger log )
{
//code removed for clarity


app.UseAuthorization();

app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});

//Code removed for clarity

// global error handler
app.UseMiddleware<GlobalExceptionMiddleware>();
app.ConfigureExceptionHandler( log );
}
}
}

有人看到我做错了什么吗？

Answer 1

您有一个订单发布源

更改为：

app.UseAuthorization();
// global error handler
app.UseMiddleware<GlobalExceptionMiddleware>(); //custom Middleware Must be before endpoints and after auth. 
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});

您将不需要该应用程序。UseExceptionHandler。