NETCORE - 全局异常处理（Exception）

环境：.net6

创建异常中间件：ExceptionHandlingMiddleware.cs

using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace Rail.Medium.Middleware
{
    public class ExceptionHandlingMiddleware
    {


        private readonly RequestDelegate _next;  // 用来处理上下文请求  
        public ExceptionHandlingMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext); //要么在中间件中处理，要么被传递到下一个中间件中去
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(httpContext, ex); // 捕获异常了 在HandleExceptionAsync中处理
            }
        }
        private async Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";  // 返回json 类型
            var response = context.Response;

            var errorResponse = new ErrorResponse
            {
                Success = false,
            };  // 自定义的异常错误信息类型

            switch (exception)
            {
                //case ApplicationException ex:
                //    if (ex.Message.Contains("Invalid token"))
                //    {
                //        response.StatusCode = (int)HttpStatusCode.Forbidden;
                //        errorResponse.Message = ex.Message;
                //        break;
                //    }
                //    response.StatusCode = (int)HttpStatusCode.BadRequest;
                //    errorResponse.Message = ex.Message;
                //    break;
                //case KeyNotFoundException ex:
                //    response.StatusCode = (int)HttpStatusCode.NotFound;
                //    errorResponse.Message = ex.Message;
                //    break;

                default:
                    response.StatusCode = (int)HttpStatusCode.InternalServerError;
                    errorResponse.Message = exception.Message;// "Internal Server errors. Check Logs!";
                    break;
            }
            var result = JsonSerializer.Serialize(errorResponse);
            await context.Response.WriteAsync(result);
        }

        private class ErrorResponse
        {
            public bool Success { get; set; } = true;
            public string Message { get; set; }
        }
    }
}

使用中间件

在Program.cs 中引入中间件

app.UseMiddleware<ExceptionHandlingMiddleware>();

控制器中原写法

      [HttpGet]
        [Route("GetOrganizationSelectTreeAsync")]
        public async Task<ActionResult> GetOrganizationSelectTreeAsync()
        {
            try
            {
                var arr = await iUserOrganizationRepository.GetOrganizationSelectTreeAsync();
                return Ok(arr);
            }
            catch (Exception ex)
            {
                return BadRequest(ex.Message);
            }
        }

　　增加异常处理中间件后

       [HttpGet]
        [Route("GetOrganizationTreeAsync")]
        public async Task<ActionResult> GetOrganizationTreeAsync()
        {
            var arr = await iUserOrganizationRepository.GetOrganizationTreeAsync();
            return Ok(arr);
        }

end