WebAPISignalRChat/Backend/Diligent.WebAPI.Host/Middlewares/ExceptionHandlingMiddleware.cs

using AutoMapper;
using Diligent.WebAPI.Host.Exceptions;
using System.Net;

namespace Diligent.WebAPI.Host.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 (Exception ex)
            {
                await HandleExceptionAsync(httpContext, ex);
            }
        }
        private async Task HandleExceptionAsync(HttpContext context, Exception ex)
        {
            context.Response.ContentType = "application/json";

            context.Response.StatusCode = ex switch
            {
                NotFoundException => (int)HttpStatusCode.NotFound,
                KeyNotFoundException => (int)HttpStatusCode.NotFound,
                BadHttpRequestException => (int)HttpStatusCode.BadRequest,
                //...
                _ => (int)HttpStatusCode.InternalServerError
            };

            _logger.LogError(ex.Message);

            await context.Response.WriteAsync(new ErrorDetails()
            {
                StatusCode = context.Response.StatusCode,
                Message = ex.Message
            }.ToString());
        }
    }
}