session-companion/SessionCompanion/SessionCompanion/Configurations/ExceptionMiddleware.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using SessionCompanion.ViewModels.ApiResponses;

namespace SessionCompanion.Configurations
{
    using System.Net;

    using Microsoft.AspNetCore.Http;

    using SessionCompanion.Extensions.ApiErrors;

    public class ExceptionMiddleware
    {
        private readonly RequestDelegate _next;
        public ExceptionMiddleware(RequestDelegate next)
        {
            _next = next;
        }
        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(httpContext, ex);
            }
        }
        private Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";
            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;

            string response = "{\"statusCode\":" + context.Response.StatusCode + ",\"message\":\"" + exception.Message
                              + "\"}";

            return context.Response.WriteAsync(response);
        }
    }
}