aspnetcore配置log4net并添加全局异常处理

第一步:在NuGet中引用log4net

第二步:创建log4net.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <log4net>
    <!-- 错误日志类-->
    <logger name="Error">
      <level value="ALL" />
      <appender-ref ref="ErrorAppender" />
    </logger>
    <!-- 错误日志附加介质-->
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志文件路径-->
      <param name="File" value="Logs\\Error\\" />
      <!--是否是向文件中追加日志-->
      <param name="AppendToFile" value="true" />
      <!--log保留天数-->
      <param name="MaxSizeRollBackups" value="1000" />
      <!--最大文件大小-->
      <param name="MaxFileSize" value="10240" />
      <!--日志文件名是否是固定不变的-->
      <param name="StaticLogFileName" value="false" />
      <!--日志文件名格式为:2008-08-31.log-->
      <param name="DatePattern" value="yyyy-MM-dd.'log'" />
      <!--日志根据日期滚动-->
      <param name="RollingStyle" value="Date" />
      <!--信息日志布局-->
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%n==========%n【日志级别】:%-5level%n【记录时间】:%date %n【执行时间】:[%r]毫秒%n%message%n" />
      </layout>
    </appender>

    <!-- 信息日志类 -->
    <logger name="Info">
      <level value="ALL" />
      <appender-ref ref="InfoAppender" />
    </logger>
    <!-- 信息日志附加介质-->
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志文件路径-->
      <param name="File" value="Logs\\Info\\" />
      <!--是否是向文件中追加日志-->
      <param name="AppendToFile" value="true" />
      <!--log保留天数-->
      <param name="MaxSizeRollBackups" value="100" />
      <param name="MaxFileSize" value="1" />
      <!--日志文件名是否是固定不变的-->
      <param name="StaticLogFileName" value="false" />
      <!--日志文件名格式为:2008-08-31.log-->
      <param name="DatePattern" value="yyyy-MM-dd.'log'" />
      <!--日志根据日期滚动-->
      <param name="RollingStyle" value="Date" />
      <!--信息日志布局-->
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%n==========%n【日志级别】:%-5p%n【记录时间】:%d [%t]%n【信息详情】:%m%n"  />
      </layout>
    </appender>
  </log4net>
</configuration>

第三步:新建Log4NetConfig.cs类,这里我是把工厂名放在配置文件中获取,一般情况下不需要这样操作,直接在代码内写死即可。

using log4net;
using log4net.Config;
using Microsoft.Extensions.Configuration;
using System;
using System.IO;

namespace Taoxue.SchoolRoll.Website
{
    public class Log4NetConfig
    {
        public static string RepositoryName { get; set; }

        public static void Init(IConfiguration configuration)
        {
            var repositoryName = configuration.GetSection("Log4Net:RepositoryName").Value;
            if (string.IsNullOrWhiteSpace(repositoryName))
            {
                throw new Exception("必须在配置文件中添加 Log4Net > RepositoryName 节点");
            }

            RepositoryName = repositoryName;

            var configFilePath = configuration.GetSection("Log4Net:ConfigFilePath").Value;
            if (string.IsNullOrWhiteSpace(configFilePath))
            {
                configFilePath = "log4net.config";
            }

            var file = new FileInfo(configFilePath);
            var repository = LogManager.CreateRepository(repositoryName);
            XmlConfigurator.Configure(repository, file);
        }
    }
}

第四步:在startup.cs中初始化配置

public Startup(IConfiguration configuration)
{
    Configuration = configuration;
    Log4NetConfig.Init(Configuration);
}

第五步:在appsettings.json中创建Log4net节点,注意,这里我是把log4net.config放在  站点根目录/Log4Net 目录下

"Log4Net": {
    "RepositoryName": "NETCoreRepository",
    "ConfigFilePath": "Log4Net/log4net.config" 
} 

第六步:创建Log4NetUtil.cs文件

using log4net;
using System;

namespace Taoxue.SchoolRoll.Website
{
    public class Log4NetUtil
    {
        private static readonly ILog ErrorLog = LogManager.GetLogger(Log4NetConfig.RepositoryName, "Error");

        private static readonly ILog InfoLog = LogManager.GetLogger(Log4NetConfig.RepositoryName, "Info");

        /// <summary>
        /// 全局异常错误记录持久化
        /// </summary>
        /// <param name="throwMsg"></param>
        /// <param name="ex"></param>
        public static void LogError(string throwMsg, Exception ex)
        {
            var errorMsg =
                $"【抛出信息】:{throwMsg} \r\n【异常类型】:{ex.GetType().Name} \r\n【异常信息】:{ex.Message} \r\n【堆栈调用】:\r\n{ex.StackTrace}";
            ErrorLog.Error(errorMsg);
        }

        public static void LogInfo(string msg)
        {
            InfoLog.Info(msg);
        }
    }
}

至此,Log4Net配置完成,下面添加一个全局异常处理类测试下

using HZC.Core;
using HZC.Utils.Mvc;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using System;

namespace Taoxue.SchoolRoll.Website.Extensions
{
    public class MvcGlobalExceptionFilter : IExceptionFilter
    {
        public void OnException(ExceptionContext context)
        {
            try
            {
                Log4NetUtil.LogError("Mvc全局异常", context.Exception);
                if (context.HttpContext.Request.IsAjax())
                {
                    context.Result = new JsonResult(ResultUtil.Fail(context.Exception.Message));
                }
                else
                {
                    context.Result = new RedirectToActionResult("Error", "Home", new { });
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                throw;
            }
        }
    }
}

在  startup.cs 的 ConfigureServices 中使用如下代码

services.AddMvc(option =>
    {
         option.Filters.Add<MvcGlobalExceptionFilter>();
    })             
    .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

修改  HomeController 的 Index ,手动抛出异常

public IActionResult Index()
{
    throw new Exception("异常测试");
    return View();
}

执行程序,在  根目录/Logs/Error 文件夹下查看生成的日志文件,发现已经写入如下内容

==========
【日志级别】:ERROR
【记录时间】:2019-05-16 00:40:49,071 
【执行时间】:[1750]毫秒
【抛出信息】:Mvc全局异常 
【异常类型】:Exception 
【异常信息】:异常测试 
【堆栈调用】:
   at Taoxue.SchoolRoll.Website.Controllers.HomeController.Index() in E:\项目\CSharp\xx\xxxx\Taoxue.SchoolRoll.Website\Controllers\HomeController.cs:line 19
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextExceptionFilterAsync()

到这里,log4net配置和全局异常捕捉就完成了。

需要注意的是,这里所谓的全局是指进入mvc中间件后产生的异常,如果在其他中间件中异常了,上面的方法是捕捉不到的,下面来模拟一下:

在 startup.cs 的 Configure 方法中 app.UserMvc(...) 之前添加如下代码

app.Use(async (context, next) =>
{
    if (context.Request.Path.Value.Contains("test"))
    {
        throw new Exception("中间件异常测试");
    }
    await next();
});

上面代码的作用是,当访问地址中带有 test 则抛出异常。

执行程序,访问  http://localhost:5000/test 会发现,程序报错,这时查看日志会发现,异常并没有被记录,也就是说,异常没有被我们的MvcGlobalExceptionFilter捕捉到,这显然不是我们想要的。

如果要捕捉到这种异常需要怎么处理呢?其实程序中已经给出了提示:

if (env.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}
else
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}

这是 startup.cs  Configure 中自动帮我们添加的代码,就是用于异常的捕获和处理,一种方式是对 /Home/Error 进行处理,在该action内记录异常,这种方法比较简单,这里就不详细说了。

接下来,我们用自定义中间件的方式来实现一下。

新建  GlobalExceptionMiddleware.cs 文件

using HZC.Core;
using HZC.Utils.Mvc;
using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System;
using System.Threading.Tasks;

namespace Taoxue.SchoolRoll.Website.Extensions
{
    public class GlobalExceptionMiddleWare
    {
        public readonly RequestDelegate Next;

        public GlobalExceptionMiddleWare(RequestDelegate next)
        {
            Next = next;
        }

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await Next(context);
            }
            catch (Exception e)
            {
                context.Response.Clear();
                context.Response.StatusCode = StatusCodes.Status200OK;

                Log4NetUtil.LogError("全局异常", e);

                if (context.Request.IsAjax())
                {
                    context.Response.ContentType = ResponseContentTypes.Json;
                    await context.Response.WriteAsync(JsonConvert.SerializeObject(new { Code = 500, Message = e.Message }));
                }
                else
                {
                    context.Response.Redirect("/Home/Error");
                }
            }
        }
    }
}

建议在 Invoke 方法中 catch 代码块中再包一层 try..catch ,以防止处理代码发生错误时出现异常。

接下来,修改 startup.cs 的 Configure 方法,注释掉系统自带的异常处理代码,添加我们自定义的中间件

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    //if (env.IsDevelopment())
    //{
    //    app.UseDeveloperExceptionPage();
    //}
    //else
    //{
    //    app.UseExceptionHandler("/Home/Error");
    //    app.UseHsts();
    //}
    app.UseMiddleware<GlobalExceptionMiddleWare>();

    app.Use(async (context, next) =>
    {
        if (context.Request.Path.Value.Contains("test"))
        {
            throw new Exception("中间件异常测试");
        }
        await next();
    });

    app.UseHttpsRedirection();
    app.UseStaticFiles();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

再次执行程序,访问  http://localhost:5000/test 会发现我们定义的逻辑被执行,并且该异常也被记录到了日志文件中

==========
【日志级别】:ERROR
【记录时间】:2019-05-16 01:20:56,051 
【执行时间】:[7830]毫秒
【抛出信息】:全局异常 
【异常类型】:Exception 
【异常信息】:中间件异常测试 
【堆栈调用】:
   at Taoxue.SchoolRoll.Website.Startup.<>c.<<Configure>b__5_0>d.MoveNext() in E:\项目\CSharp\xx\xxxx\Taoxue.SchoolRoll.Website\Startup.cs:line 77
--- End of stack trace from previous location where exception was thrown ---
   at Taoxue.SchoolRoll.Website.Extensions.GlobalExceptionMiddleWare.Invoke(HttpContext context) in E:\项目\CSharp\xx\xxxx\Taoxue.SchoolRoll.Website\Extensions\GlobalExceptionMiddleWare.cs:line 23

 

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转载自www.cnblogs.com/diwu0510/p/10873142.html
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