将我的应用程序移至生产环境后，我在事件查看器中记录了常规Object reference not set to an instance of an object.异常。
这种异常每天间歇性地发生几次，问题是我无法解决问题，记录的异常细节没有用，因为堆栈跟踪中没有包含代码行号。
我的家庭控制器中的操作发生异常，这是每个到达网站的用户的入口点操作。
任何人都可以通过以下追踪来帮助我：
ERROR => Object reference not set to an instance of an object.
(XXX.XXX.Web.Controllers.HomeController.Index)
(
<>c__DisplayClass2b.<BeginInvokeAction>b__1c =>
<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32 =>
<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f =>
AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d =>
WrappedAsyncResult`2.CallEndDelegate =>
AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39 =>
ControllerActionInvoker.InvokeActionMethod =>
ReflectedActionDescriptor.Execute =>
<no type>.lambda_method => HomeController.Index )
System.NullReferenceException: Object reference not set to an instance of an object.
at XXXX.XXXX.Web.Controllers.HomeController.Index()
代码：
[SSOAuthorize]
public ActionResult Index()
{
try
{
ViewBag.ShowXXXAccountPrompt = false;
ViewBag.IsErrored = "false";
#region "Session Check"
if (_webHttpContext == null)
{
return RedirectToAction("signout", "Federation");
}
if (_webHttpContext.Session == null)
{
return RedirectToAction("signout", "Federation");
}
if (_webHttpContext.Session.PortalUser == null)
{
return RedirectToAction("signout", "Federation");
}
#endregion
if (_webHttpContext.Session.PortalUser != null)
{
if (!string.IsNullOrEmpty(_webHttpContext.Session.PortalUser.UserName))
{
var user = _usersManagementService.GetUserByUsername(_webHttpContext.Session.PortalUser.UserName);
var latestsubline = _subscriptionLineService.GetLatestLineByUserName(_webHttpContext.Session.PortalUser.UserName);
var isDualAccount = latestsubline == null ? false : latestsubline.Action == (int)Entities.SubscriptionLineAction.Activate? latestsubline.IsDualAccount : false;
isDualAccount = isDualAccount == null ? false : isDualAccount;
if(user == null)
{
//whenever there is no account Just Create it, the subscriptionLines table is irrelevant
_usersManagementService.CreateUser(_webHttpContext.Session.PortalUser.UserName, isDualAccount);
}
if (user.Status == AccountStatus.Inactive)
{
//Account Re-Activation Logic
if (_usersManagementService.CreateAccountHistory(user))
{
user.FirstLogonOn = DateTime.Now;
user.DeactivatedOn = null;
user.Status = AccountStatus.Active;
user.IsDualAccount = isDualAccount;
_usersManagementService.UpdateAccount(user);
#region "Check XXX Dual Account"
try
{
if (_webHttpContext.Session.MultipleAccountDialogueInformed == false)
{
_webHttpContext.Session.MultipleAccountDialogueInformed = true;
if (user.IsDualAccount == true)
{
ViewBag.ShowXXXAccountPrompt = true;
}
else
{
ViewBag.ShowXXXAccountPrompt = false;
}
}
}
catch (Exception ex)
{
_logger.Log(LogLevel.Error, "XXX Account Service _ " + ex.Message, ex);
}
#endregion
}
else
{
ViewBag.IsErrored = "true";
return View(_webHttpContext.Account);
}
}
else
{
#region "Check XXX Dual Account"
try
{
if (_webHttpContext.Session.MultipleAccountDialogueInformed == false)
{
_webHttpContext.Session.MultipleAccountDialogueInformed = true;
if (user.IsDualAccount == true)
{
ViewBag.ShowXXXAccountPrompt = true;
}
else
{
ViewBag.ShowXXXAccountPrompt = false;
}
}
}
catch (Exception ex)
{
_logger.Log(LogLevel.Error, "XXX Account Service _ " + ex.Message, ex);
}
#endregion
}
_webHttpContext.BrowserDetails.OperatingSystem = Entities.OperatingSystem.MacinXXXh;
_webHttpContext.Session.PortalUser.Id = user.Id;
if (_webHttpContext.BrowserDetails.OperatingSystem == Entities.OperatingSystem.Windows)
{
ViewBag.ProductType = "ZZZ";
var YYYInstallsDetails = GetYYYInstallsDetails(0);
ViewBag.RemainingInstallCount = YYYInstallsDetails.NumberOfSeatsAvailable;
ViewBag.YYYInstallsDetails = YYYInstallsDetails.YYYCustomersLicenseDetailsList;
ViewBag.YYYInstallsDetailsCount = YYYInstallsDetails.YYYCustomersLicenseDetailsList.Count;
ViewBag.DownloadPageUrl = getDownloadPageUrl(ProductType.ComputerProtectionNT);
ViewBag.ProductId = (int)ProductType.ComputerProtectionNT;
}
else if (_webHttpContext.BrowserDetails.OperatingSystem == Entities.OperatingSystem.MacinXXXh)
{
ViewBag.ProductType = "MacZZZ";
var YYYInstallsDetails = GetYYYInstallsDetails(1);
ViewBag.RemainingInstallCount = YYYInstallsDetails.NumberOfSeatsAvailable;
ViewBag.YYYInstallsDetails = YYYInstallsDetails.YYYCustomersLicenseDetailsList;
ViewBag.YYYInstallsDetailsCount = YYYInstallsDetails.YYYCustomersLicenseDetailsList.Count;
ViewBag.DownloadPageUrl = getDownloadPageUrl(ProductType.ComputerProtectionOSX);
ViewBag.ProductId = (int)ProductType.ComputerProtectionOSX;
}
else if (_webHttpContext.BrowserDetails.OperatingSystem == Entities.OperatingSystem.Other)
{
ViewBag.ProductType = "AndroidZZZ";
var YYYInstallsDetails = GetYYYInstallsDetails(2);
ViewBag.RemainingInstallCount = YYYInstallsDetails.NumberOfSeatsAvailable;
ViewBag.YYYInstallsDetails = YYYInstallsDetails.YYYCustomersLicenseDetailsList;
ViewBag.YYYInstallsDetailsCount = YYYInstallsDetails.YYYCustomersLicenseDetailsList.Count;
ViewBag.DownloadPageUrl = getDownloadPageUrl(ProductType.ComputerProtectionAndroid);
ViewBag.ProductId = (int)ProductType.ComputerProtectionAndroid;
}
ViewBag.ZZZInstallUrl = PortalConfig.ZZZInstallUrl;
ViewBag.ScInstallUrl = PortalConfig.SafeCentralInstallUrl;
ViewBag.MacZZZInstallUrl = PortalConfig.MacZZZInstallUrl;
ViewBag.TTTTEmail = _webHttpContext.Session.PortalUser.UserName;
}
else // if primary username coming back from sso is empty
{
return RedirectToAction("signout", "Federation");
}
}
else // if the portal user is null
{
return RedirectToAction("signout", "Federation");
}
}
catch (Exception ex)
{
ViewBag.IsErrored = "true";
_logger.Log(LogLevel.Error, ex.Message, ex);
}
return View(_webHttpContext.Account);
}