1.新建一个Api接口统一返回类ApiResult.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Jom.WebApi.Config
{
    public class ApiResult
    {
        public bool Success { get; set; } = true;
        public string Msg { get; set; } = "";
        public string Type { get; set; } = "";
        public object Data { get; set; } = "";
        public object DataExt { get; set; } = "";
    }
}

2.建立中间件ErrorHandlingMiddleware.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Jom.WebApi.Config
{
    public class ErrorHandlingMiddleware
    {
        private readonly RequestDelegate next;

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

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await next(context);
            }
            catch (Exception ex)
            {
                var statusCode = context.Response.StatusCode;
                if (ex is ArgumentException)
                {
                    statusCode = 200;
                }
                await HandleExceptionAsync(context, statusCode, ex.Message);
            }
            finally
            {
                var statusCode = context.Response.StatusCode;
                var msg = "";
                if (statusCode == 401)
                {
                    msg = "未授权";
                }
                else if (statusCode == 404)
                {
                    msg = "未找到服务";
                }
                else if (statusCode == 502)
                {
                    msg = "请求错误";
                }
                else if (statusCode != 200)
                {
                    msg = "未知错误";
                }
                if (!string.IsNullOrWhiteSpace(msg))
                {
                    await HandleExceptionAsync(context, statusCode, msg);
                }
            }
        }
　　　　 //异常错误信息捕获，将错误信息用Json方式返回
        private static Task HandleExceptionAsync(HttpContext context, int statusCode, string msg)
        {
            var result = JsonConvert.SerializeObject(new ApiResult() { Success=false,Msg=msg,Type= statusCode.ToString() });
            context.Response.ContentType = "application/json;charset=utf-8";
            return context.Response.WriteAsync(result);
        }
    }
　　//扩展方法
    public static class ErrorHandlingExtensions
    {
        public static IApplicationBuilder UseErrorHandling(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<ErrorHandlingMiddleware>();
        }
    }
}

　3.最后只要在Startup.cs或Program.cs中添加引用using Jom.WebApi.Config;
使用扩展方法ErrorHandlingExtensions()使用错误码处理中间件。

//请求错误提示配置
 app.UseErrorHandling();

　最后就完成了自定义401页面内容，同时还可以定义其他状态码如403，404，502，503等等，同时api接口报异常也将转化为特定的JSON格式。

postman中请求返回

• 本文标题： NETCoreAPI 自定义401和异常显示内容（JWT认证、Cookie Base认证失败显示内容）
• 文章分类：【.NET/Web】
• 非特殊说明，本文版权归【胡同里的砖头】个人博客 所有，转载请注明出处.

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