Exception Handling Middleware

ErrorDto.cs

namespace StaffService.Dto
{
    public class ErrorDto
    {
        public int StatusCode { get; set; }

        public string Message { get; set; }
    }
}

ExceptionHandlingMiddleware.cs

using StaffService.Dto;
using System.Net;
using System.Text.Json;


// Обработчик ошибок (промежуточное ПО чтобы не писать обработчики в контроллере для отлова ошибок)
// Все ошибки будут обрабатываться в одном месте...

namespace StaffService.Middlewares
{
    public class ExceptionHandlingMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger<ExceptionHandlingMiddleware> _logger;

        public ExceptionHandlingMiddleware(
            RequestDelegate next,
            ILogger<ExceptionHandlingMiddleware> logger)
        {
            _next = next;
            _logger = logger;
        }

        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext);
            }
            catch (KeyNotFoundException ex)
            {
                await HandleExceptionAsync(httpContext,
                    ex.Message,
                    HttpStatusCode.NotFound,
                    "It's impossible, but... Roberto NOT FOUND!!!");
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(httpContext,
                    ex.Message,
                    HttpStatusCode.InternalServerError,
                    "Internal server error");
            }
        }

        private async Task HandleExceptionAsync(HttpContext context, string exMsg, HttpStatusCode httpStatusCode, string message)
        {
            _logger.LogError(exMsg);

            HttpResponse response = context.Response;

            response.ContentType = "application/json";
            response.StatusCode = (int)httpStatusCode;

            ErrorDto errorDto = new()
            {
                Message = message,
                StatusCode = (int)httpStatusCode
            };

            await response.WriteAsJsonAsync(errorDto);
        }
    }
}

Program.cs

//...
app.UseMiddleware<ExceptionHandlingMiddleware>();
//...

https://www.youtube.com/watch?v=RAcpAc0EYV0