WebAPI增加log4net错误日志：GlobalExceptionFilter记录异常堆栈到App_Data\logs

src/CncWebApi/CncWebApi.csproj

@@ -43,6 +43,7 @@
   <ItemGroup>
     <Content Include="Web.config" CopyToOutputDirectory="PreserveNewest" />
     <Content Include="Global.asax" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="log4net.config" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
 </Project>

src/CncWebApi/Filters/GlobalExceptionFilter.cs

@@ -4,6 +4,7 @@ using System.Web.Http;
 using System.Web.Http.Filters;
 using CncModels.Dto;
 using CncService;
+using log4net;
 
 namespace CncWebApi.Filters
 {
@@ -14,6 +15,8 @@ namespace CncWebApi.Filters
     /// </summary>
     public class GlobalExceptionFilter : ExceptionFilterAttribute
     {
+        private static readonly ILog _log = LogManager.GetLogger(typeof(GlobalExceptionFilter));
+
         /// <summary>
         /// 异常发生时自动调用
         /// </summary>
@@ -23,6 +26,7 @@ namespace CncWebApi.Filters
             if (context.Exception is BusinessException bex)
             {
                 // 业务异常：返回对应的错误码和消息
+                _log.Warn($"业务异常: [{bex.Code}] {bex.Message}");
                 var response = ApiResponse<object>.Fail(bex.Code, bex.Message);
                 context.Response = context.Request.CreateResponse(
                     HttpStatusCode.OK, response);
@@ -30,7 +34,8 @@ namespace CncWebApi.Filters
             else
             {
                 // 未预期异常：返回通用错误提示，不暴露内部细节
-                // 详细异常信息由log4net记录到日志文件
+                var requestUrl = context.Request?.RequestUri?.ToString();
+                _log.Error($"未处理异常: {requestUrl}", context.Exception);
                 var response = ApiResponse<object>.Fail(
                     CncModels.Constants.ErrorCode.InternalError,
                     "服务器内部错误，请稍后重试");

src/CncWebApi/Global.asax.cs

@@ -1,7 +1,9 @@
 using System;
+using System.IO;
 using System.Web;
 using System.Web.Http;
 using CncWebApi.App_Start;
+using log4net;
 
 namespace CncWebApi
 {
@@ -16,6 +18,13 @@ namespace CncWebApi
         /// </summary>
         protected void Application_Start()
         {
+            // 初始化 log4net
+            var logConfig = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config");
+            if (File.Exists(logConfig))
+            {
+                log4net.Config.XmlConfigurator.Configure(new FileInfo(logConfig));
+            }
+
             GlobalConfiguration.Configure(WebApiConfig.Register);
         }
 

src/CncWebApi/log4net.config

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<log4net>
+  <!-- 错误日志（ERROR和FATAL） -->
+  <appender name="ErrorFileAppender" type="log4net.Appender.RollingFileAppender">
+    <file value="App_Data\logs\error.log" />
+    <appendToFile value="true" />
+    <rollingStyle value="Size" />
+    <maxSizeRollBackups value="10" />
+    <maximumFileSize value="10MB" />
+    <staticLogFileName value="true" />
+    <threshold value="ERROR" />
+    <layout type="log4net.Layout.PatternLayout">
+      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline%exception%newline" />
+    </layout>
+  </appender>
+
+  <!-- 全量日志（INFO及以上） -->
+  <appender name="AllFileAppender" type="log4net.Appender.RollingFileAppender">
+    <file value="App_Data\logs\webapi.log" />
+    <appendToFile value="true" />
+    <rollingStyle value="Size" />
+    <maxSizeRollBackups value="10" />
+    <maximumFileSize value="10MB" />
+    <staticLogFileName value="true" />
+    <layout type="log4net.Layout.PatternLayout">
+      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline%exception%newline" />
+    </layout>
+  </appender>
+
+  <root>
+    <level value="INFO" />
+    <appender-ref ref="AllFileAppender" />
+    <appender-ref ref="ErrorFileAppender" />
+  </root>
+</log4net>