ASP.NET Core 中间件的使用之全局异常处理机制

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

namespace Log4NetWebAPI.Controllers
{
    public class ExceptionFilter: IExceptionFilter
    {
        //全局异常处理机制
        public void OnException(ExceptionContext context)
        {
            Exception ex = context.Exception;

            //错误所在的控制器方法名称
            var DisplayName = context.ActionDescriptor.DisplayName;

            #region 错误所在的行号行号

            ////行号前的名称有的是中文，有的是英文，注意甄别
            //var aaa = ex.StackTrace.Substring(ex.StackTrace.IndexOf("行号"), ex.StackTrace.Length - ex.StackTrace.IndexOf("行号"));
            //var ccc = ex.StackTrace.Substring(ex.StackTrace.IndexOf("line"), ex.StackTrace.Length - ex.StackTrace.IndexOf("line"));
            var lineNumber = 0;
            const string lineSearch = ":line ";
            var index = ex.StackTrace.LastIndexOf(lineSearch);
            if (index != -1)
            {
                var lineNumberText = ex.StackTrace.Substring(index + lineSearch.Length);
                var lineNumberStr = lineNumberText.Substring(0, lineNumberText.IndexOf("\r\n"));
                if (int.TryParse(lineNumberStr, out lineNumber))
                {

                }
            }

            #endregion

            #region 写入信息到【数据库】，这里自行入库即可（mongodb、SqlServer、MySQL等），我以SqlServer为例

            errorLog md = new errorLog();
            md.logTime = DateTime.Now;
            md.logType = "error";
            md.displayName = DisplayName;  //错误位置
            md.lineNumber = lineNumber;  //错误行号
            md.message = ex.Message;    //错误信息
            md.messagedetails = ex.ToString();  //错误详情
            md.createTime= DateTime.Now;

            using (var ctx = new dbContext())
            {

                ctx.Add(md);
                ctx.SaveChanges();
            }
            #endregion

            //下面是你的返回页面显示的内容提示，以下省略

        }
    }
}

// This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();

            //添加全局异常处理机制
            services.AddMvc(option => {
                option.Filters.Add<ExceptionFilter>();
            });
        }