将每个对web api方法的请求记录到文件中

Question

我的要求是将记录添加到每个请求以及对文件的响应和错误。我试过这个，

public class LogRequestAndResponseHandler : DelegatingHandler
{
    private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

    protected override async Task<HttpResponseMessage> SendAsync(
        HttpRequestMessage request, CancellationToken cancellationToken)
    {
        // log request body
        string requestBody = await request.Content.ReadAsStringAsync();
        Log.Info(requestBody);

        // let other handlers process the request
        var result = await base.SendAsync(request, cancellationToken);

        if (result.Content != null)
        {
            // once response body is ready, log it
            var responseBody = await result.Content.ReadAsStringAsync();
            Log.Info(responseBody);
        }

        return result;
    }
}

将它添加到MVC5的WebApiConfig中，如下所示，

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services

        log4net.Config.XmlConfigurator.Configure();

        config.MessageHandlers.Add(new LogRequestAndResponseHandler());

        // Web API routes
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}

Web配置有此部分，

  <log4net>
    <!-- file appender -->
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="C:/logs/my_log_file.log"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <maxSizeRollBackups value="30"/>
      <datePattern value=".yyyy-MM-dd"/>
      <staticLogFileName value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
      </layout>
    </appender>
    <root>
      <level value="DEBUG"/>
      <appender-ref ref="RollingFileAppender"/>
    </root>
  </log4net>

没有任何东西被添加到文件中并且没有错误，有什么我做错了，它创建文件但是没有记录吗？