Asp.net Core 全局異常處理

中間件方式

1. 建立中間件處理類
2. Startup.cs 中註冊
3. 任何Controller中的Action拋出異常均可被捕捉

在項目根目錄下自建目錄Middleware

新建中間件類ErrorHandlerMiddleware，

using Newtonsoft.Json;
using System.Net;
using Uap.Exceptions;

namespace Uap.Middleware
{
    /// <summary>
    /// 全局錯誤處理中間件
    /// </summary>
    public class ErrorHandlerMiddleware
    {
        private readonly RequestDelegate next;

        public ErrorHandlerMiddleware(RequestDelegate next)
        {
            this.next = next;
        }

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await next(context);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(context, ex);
            }
        }

        private static Task HandleExceptionAsync(HttpContext context, Exception ex)
        {
            var code = 0;
            var message = "Unknown error";

            // BadHttpRequestException，請求類錯誤
            // ServiceException，自定義的後端處理類錯誤

            if (ex is BadHttpRequestException)
            {
                code = ((BadHttpRequestException)ex).StatusCode;
                message = ex.Message;
            }
            else if (ex is ServiceException)
            {
                code = (int)((ServiceException)ex).StatusCode;
                message = ex.Message;
            }
            else
            {
                code = (int)HttpStatusCode.InternalServerError;
                message = "Internal server error";
            }

            context.Response.ContentType = "application/json";
            context.Response.StatusCode = code;
            return context.Response.WriteAsync(JsonConvert.SerializeObject(new { message = message }));
        }
    }
}

引用

ASP.NET Core Web API通過中間件或UseExceptionHandler異常處理方法