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我正在我的项目中编写一个异常测试过滤器，我想在其中记录请求和响应对象。这是我的代码： 

public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
    //Add custom log
    LogEventInfo eventInfo = new LogEventInfo();
    eventInfo.TimeStamp = DateTime.Now;
    eventInfo.Level = LogLevel.Error;
    eventInfo.Exception = actionExecutedContext.Exception;
    eventInfo.Properties["STATUS"] = actionExecutedContext.Response != null ? actionExecutedContext.Response.StatusCode : System.Net.HttpStatusCode.InternalServerError;
    try
    {
        eventInfo.Properties["PAYLOAD"] = "";
        if (actionExecutedContext.Response != null && actionExecutedContext.Response.StatusCode != System.Net.HttpStatusCode.OK)
        {
            eventInfo.Properties["PAYLOAD"] += JsonConvert.SerializeObject(actionExecutedContext.Request, Formatting.None,
                        new JsonSerializerSettings()
                        {
                            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                        });
            eventInfo.Properties["PAYLOAD"] += JsonConvert.SerializeObject(actionExecutedContext.Response, Formatting.None,
                        new JsonSerializerSettings()
                        {
                            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                        });
        }
    }
    catch (Exception ex)
    {
        eventInfo.Properties["PAYLOAD"] = "Logging Exception: " + ex.Message;
    }
    _logger.Log(eventInfo);
}

在执行上述代码时，它总是抛出异常Error getting value from 'ReadTimeout' on 'Microsoft.Owin.Host.SystemWeb.CallStreams.InputStream'。任何人都可以为这个问题提出任何解决方案吗？如何序列化HttpActionExecutedContext的Request和Response对象？

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