.net core 中使用IAsyncExceptionFilter 捕获全局异常，统一返回信息

新建一个API 项目(.net 6)

添加ExceptionHandel 类

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace ExceptionFilter
{
    
    public class ExceptionHandel : IAsyncExceptionFilter
    {
    
        private readonly IWebHostEnvironment _webHostEnvironment;

        public ExceptionHandel(IWebHostEnvironment webHostEnvironment)
        {
    
            _webHostEnvironment = webHostEnvironment;
        }
        public Task OnExceptionAsync(ExceptionContext context)
        {
    
            string msg = string.Empty;
            if (_webHostEnvironment.IsDevelopment())
            {
    
                msg = context.Exception.ToString();
            }
            else
            {
    
                msg = $"服务器内部异常{
      context.ActionDescriptor.DisplayName}";
            }
            ObjectResult objectResult = new ObjectResult(new {
     code = 500, msg = msg });
            context.Result = objectResult;
            context.ExceptionHandled = true;
            return Task.CompletedTask;
        }
    }
}

注入

builder.Services.Configure<MvcOptions>(opt =>
{
    
    opt.Filters.Add<ExceptionHandel>();
});

制造一个报错的API

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace ExceptionFilter.Controllers
{
    
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
    
        [HttpGet]
        public Task getValue()
        {
    
            return System.IO.File.ReadAllLinesAsync("1.txt");
        }
    }
}