app.UseExceptionHandler(configure =>

{

    configure.Run(async context =>

    {

        var exHeader = context.Features.Get<IExceptionHandlerPathFeature>();

        var ex = exHeader.Error;

        if (ex != default)

        {

            await context.Response.WriteAsJsonAsync(new { code = 500, errPath = exHeader.Path, msg = $"服务器内部错误->{ex.Message}" });

        }

    });

});

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Net;

namespace TouristRouteWebApplaction.Middleware

{

    public class ErrorHandlingMiddleware

    {

        private readonly RequestDelegate next;

        public ErrorHandlingMiddleware(RequestDelegate next)

        {

            this.next = next;

        }

        public async Task Invoke(HttpContext context /* other dependencies */)

        {

            try

            {

                await next(context);

            }

            catch (Exception ex)

            {

                await HandleExceptionAsync(context, ex);

            }

        }

        private static Task HandleExceptionAsync(HttpContext context, Exception ex)

        {

            var code = HttpStatusCode.InternalServerError; // 500 if unexpected

            if (ex is KeyNotFoundException) code = HttpStatusCode.NotFound;

            //else if (ex is MyUnauthorizedException) code = HttpStatusCode.Unauthorized;

            //else if (ex is MyException) code = HttpStatusCode.BadRequest;

            var result = JsonConvert.SerializeObject(new { error = ex.Message });//JsonConvert.SerializeObject(errorObj, opts.Value.SerializerSettings)

            context.Response.ContentType = "application/json";

            context.Response.StatusCode = (int)code;

            return context.Response.WriteAsync(result);

        }

    }

}