我是中间件概念的新手，目前正在努力寻找合适的方法来处理我的MVC核心项目中的异常。

我想发生的是捕获异常，记录异常，然后将用户发送到带有消息的友好错误页面。起初，我试图在中间件中管理所有这些，但意识到我可能做得不正确。

因此，如果我希望这个流程发生，我应该同时使用我的异常记录中间件和应用程序吗？UseExceptionHandler("/Error ")以便中间件将异常重新抛出到页面？如果是这样，如何在错误页面中获得异常的详细信息？我想首先拦截的异常处理机制应该是Configure中的最后一个，这是正确的吗？

我发现的所有例子都严格处理HTTP状态代码错误，如404；我希望处理实际的异常(及其子类)。这样，在我的视图页面中，我可以在适当的时候抛出我自己的异常(例如，如果一个视图的必填字段为空。)

启动.cs片段：

public void Configure(IApplicationBuilder app, IHostingEnvironment env, 
                      ILoggerFactory loggerFactory, LoanDbContext context) {
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    app.UseStatusCodePages();
    if (env.IsDevelopment() || env.IsEnvironment("qa")) {
        app.UseDeveloperExceptionPage();
        app.UseBrowserLink();
    } else {
        app.UseExceptionHandler("/Error");
    }
    app.UseMiddleware<MyExceptionHandler>(loggerFactory);
    // ... rest of Configure is irrelevant to this issue

MyExceptionHandler.cs

using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using System;
using System.Data.SqlClient;
using System.Threading.Tasks;

namespace MyCompany.MyProject.Helpers
{
    /// <summary>
    /// A custom Exception Handler Middleware which can be re-used in other projects.
    /// </summary>
    public sealed class MyExceptionHandler
    {
        private readonly RequestDelegate _next;
        private readonly ILogger _logger;

        public MyExceptionHandler(RequestDelegate next, ILoggerFactory loggerFactory) {
            _next = next;
            _logger = loggerFactory.CreateLogger<MyExceptionHandler>();
        }

        public async Task Invoke(HttpContext context) {
            try {
                await _next(context);
            } catch (Exception ex) {
                HandleException(ex);
            }
        }

        // I realize this function looks pointless, but it will have more meat to it eventually.
        public void HandleException(Exception ex) {
            if (ex is ArgumentException argEx) {
                _logger.LogError(0, argEx, argEx.Message);
            } else if (ex is InvalidOperationException ioEx) {
                _logger.LogError(0, ioEx, "An Invalid Operation Exception occurred. This is usually caused by a database call that expects "
                    + "one result, but receives none or more than one.");
            } else if (ex is SqlException sqlEx) {
                _logger.LogError(0, sqlEx, $"A SQL database exception occurred. Error Number {sqlEx.Number}");
            } else if (ex is NullReferenceException nullEx) {
                _logger.LogError(0, nullEx, $"A Null Reference Exception occurred. Source: {nullEx.Source}.");
            } else if (ex is DbUpdateConcurrencyException dbEx) {
                _logger.LogError(0, dbEx, "A database error occurred while trying to update your item. This is usually due to someone else modifying the item since you loaded it.");
            } else {
                _logger.LogError(0, ex, "An unhandled exception has occurred.")
            }
        }
    }
}