记录webapi日志我使用了两种办法，一种是存储TXT的log文档，但我发现使用使用了我接口的日志都会存储到我电脑上。后面改用数据库存储log。数据库存储log信息这种方法个人比较推荐。之前花费了一些时间来写TXT存储还是想记录下来。
转载自：https://blog.csdn.net/lordwish/article/details/72353851
1、引用NLog类库
打开项目的NuGet包管理器，搜索NLog，为项目添加程序包引用。
2、修改项目配置文件
在webAPI项目的Web.config中进行NLog的配置。首先在节点configuration>configSections下添加节点：
此处name必需为nlog，否则配置信息将不能被读取。 然后在configuration节点下添加节点nlog：
这里定义了日志文件的保存路径、命名格式以及日志记录类型和监听级别。
注意：<configSections>必须要紧跟在<configuration>下方
<configuration>
<configSections>
<section name="nlog" type="NLog.Config.ConfigSectionHandler,NLog" />
</configSections>
<nlog xmlns:xsi="http://www.w3.org/2001/XMLSchema">
<targets>
<target name="logfile" xsi:type="File" fileName="${basedir}/LogFile/${date:format=yyyy/MM/dd}-api.txt"/>
<target name="eventlog" xsi:type="EventLog" layout="${message}" log="Application" source="Api Services"/>
</targets>
<rules>
<logger name="*" minlevel="Trace" writeTo="logfile"/>
<logger name="*" minlevel="Trace" writeTo="eventlog"/>
</rules>
</nlog>
</configuration>
3、创建日志及跟踪类
创建日志跟踪类AppLog，继承于System.Web.Http.Tracing下的跟踪编写器接口ITraceWriter，用于日志生成和写入：
using Newtonsoft.Json; using NLog; using System; using System.Collections.Generic; using System.Linq; using System.Net.Http; using System.Text; using System.Web; using System.Web.Http.Tracing; namespace InsideMesAPI.Log { public sealed class AppLog : ITraceWriter { //日志写入 private static readonly Logger AppLogger = LogManager.GetCurrentClassLogger(); private static readonly Lazy<Dictionary<TraceLevel, Action<string>>> LoggingMap = new Lazy<Dictionary<TraceLevel, Action<string>>>(() => new Dictionary<TraceLevel, Action<string>> { {TraceLevel.Info,AppLogger.Info }, {TraceLevel.Debug,AppLogger.Debug }, {TraceLevel.Error,AppLogger.Error }, {TraceLevel.Fatal,AppLogger.Fatal }, {TraceLevel.Warn,AppLogger.Warn } }); private Dictionary<TraceLevel, Action<string>> Logger { get { return LoggingMap.Value; } } /// <summary> /// 跟踪编写器接口实现 /// </summary> /// <param name="request"></param> /// <param name="category"></param> /// <param name="level"></param> /// <param name="traceAction"></param> public void Trace(HttpRequestMessage request, string category, TraceLevel level, Action<TraceRecord> traceAction) { if (level != TraceLevel.Off)//未禁用日志跟踪 { if (traceAction != null && traceAction.Target != null) { category = category + Environment.NewLine + "Action Parameters : " + JsonConvert.SerializeObject(traceAction.Target); } var record = new TraceRecord(request, category, level); if (traceAction != null) { traceAction(record); } // traceAction?.Invoke(record); Log(record); } //throw new NotImplementedException(); } /// <summary> /// 日志写入 /// </summary> /// <param name="record"></param> private void Log(TraceRecord record) { var message = new StringBuilder(); /**************************运行日志****************************/ if (!string.IsNullOrWhiteSpace(record.Message)) { message.Append("").Append(record.Message + Environment.NewLine); } if (record.Request != null) { if (record.Request.Method != null) { message.Append("Method : " + record.Request.Method + Environment.NewLine); } if (record.Request.RequestUri != null) { message.Append("").Append("URL : " + record.Request.RequestUri + Environment.NewLine); } if (record.Request.Headers != null && record.Request.Headers.Contains("Token") && record.Request.Headers.GetValues("Token") != null && record.Request.Headers.GetValues("Token").FirstOrDefault() != null) { message.Append("").Append("Token : " + record.Request.Headers.GetValues("Token").FirstOrDefault() + Environment.NewLine); } } if (!string.IsNullOrWhiteSpace(record.Category)) { message.Append("").Append(record.Category); } //if (!string.IsNullOrWhiteSpace(record.Operator)) //{ // message.Append(" ").Append(record.Operator).Append(" ").Append(record.Operation); //} //***************************异常日志***********************************// if (record.Exception != null && !string.IsNullOrWhiteSpace(record.Exception.GetBaseException().Message)) { var exceptionType = record.Exception.GetType(); message.Append(Environment.NewLine); message.Append("").Append("Error : " + record.Exception.GetBaseException().Message + Environment.NewLine); } //日志写入本地文件 Logger[record.Level](Convert.ToString(message) + Environment.NewLine); } } }
创建日志筛选器类LogFilterAttribute，继承于System.Web.Http.Filters下的筛选器特性基类，用于定义日志内容：
using System; using System.Web.Http; using System.Web.Http.Controllers; using System.Web.Http.Tracing; namespace InsideMesAPI.Log { public class LogFilterAttribute : System.Web.Http.Filters.ActionFilterAttribute { public override void OnActionExecuting(HttpActionContext actionContext) { GlobalConfiguration.Configuration.Services.Replace(typeof(ITraceWriter), new AppLog()); var trace = GlobalConfiguration.Configuration.Services.GetTraceWriter(); //trace.Info(actionContext.Request, "Controller : " + actionContext.ControllerContext.ControllerDescriptor.ControllerType.FullName + Environment.NewLine + "Action : " + actionContext.ActionDescriptor.ActionName, "JSON", actionContext.ActionArguments); //base.OnActionExecuting(actionContext); } } }
创建异常筛选器类AbnormalFilterAttribute，继承于System.Web.Http.Filters下的异常筛选器类，用于异常信息的跟踪筛选：
using System; using System.ComponentModel.DataAnnotations; using System.Net; using System.Net.Http; using System.Web.Http; using System.Web.Http.Filters; using System.Web.Http.Tracing; namespace InsideMesAPI.Log { public class AbnormalFilterAttribute : System.Web.Http.Filters.ExceptionFilterAttribute { public override void OnException(HttpActionExecutedContext actionExecutedContext) { GlobalConfiguration.Configuration.Services.Replace(typeof(ITraceWriter), new AppLog()); var trace = GlobalConfiguration.Configuration.Services.GetTraceWriter(); trace.Error(actionExecutedContext.Request, "Controller : " + actionExecutedContext.ActionContext.ControllerContext.ControllerDescriptor.ControllerType.FullName + Environment.NewLine + "Action : " + actionExecutedContext.ActionContext.ActionDescriptor.ActionName, actionExecutedContext.Exception); var exceptionType = actionExecutedContext.Exception.GetType(); if (exceptionType == typeof(ValidationException)) { var resp = new HttpResponseMessage(HttpStatusCode.BadRequest) { Content = new StringContent(actionExecutedContext.Exception.Message), ReasonPhrase = "ValidationException" }; throw new HttpResponseException(resp); } else if (exceptionType == typeof(UnauthorizedAccessException)) { throw new HttpResponseException(actionExecutedContext.Request.CreateResponse(HttpStatusCode.Unauthorized)); } else { throw new HttpResponseException(actionExecutedContext.Request.CreateResponse(HttpStatusCode.InternalServerError)); } //base.OnException(actionExecutedContext); } } }
4、应用配置
public static class WebApiConfig { public static void Register(HttpConfiguration config) { 日志配置 config.Filters.Add(new Log.LogFilterAttribute()); config.Filters.Add(new Log.AbnormalFilterAttribute()); } }