删除计时器作业时，它将引发错误“对象引用未设置为对象的实例”

Question

我用以下代码创建了一个计时器作业：

namespace EmployeeDemo
{
    class DeleteEmployees : SPJobDefinition
    {
        public DeleteEmployees() : base() { }

        public DeleteEmployees(string jobName, SPWebApplication webapp)
            : base(jobName, webapp, null, SPJobLockType.ContentDatabase)
        {
            this.Title = "Delete Employees Timer Job";
        }

        public override void Execute(Guid targetInstanceId)
        {
            // Code
        }
    }
}

然后，我创建了一个站点范围内的功能。 在其事件接收器中，在停用时，我具有以下代码：

const string timerJobName = "Delete Employees Timer Job";
public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
{
    DeleteJob(properties.Feature.Parent as SPSite);
}
private void DeleteJob(SPSite site)
{
    foreach (SPJobDefinition job in site.WebApplication.JobDefinitions)
    {
        if (job.Name == timerJobName)
        {
            job.Delete();
        }
    }
}

但这使我出错。 通过调试，我了解到该错误是在行job.Delete();上抛出的job.Delete(); 。 错误是：

你调用的对象是空的。

语句job.Name会让我感到困惑， job.Name可以完美执行，甚至为我提供正确的计时器作业对象。 但是，在尝试删除作业时，会引发我错误。

我发现这个问题与我的问题类似，但建议对我不起作用。 在此讨论中，我尝试通过在SPSecurity.RunWithElevatedPrivileges编写删除代码来进行SPSecurity.RunWithElevatedPrivileges但对我而言仍然无效。

有谁知道为什么会这样以及如何解决呢？

更新1

更多细节。

用户代码未处理NullReferenceException

你调用的对象是空的。

这是堆栈跟踪

   at Microsoft.SharePoint.Administration.SPConfigurationDatabase.DeleteObject(Guid id)
   at Microsoft.SharePoint.Administration.SPConfigurationDatabase.Microsoft.SharePoint.Administration.ISPPersistedStoreProvider.DeleteObject(SPPersistedObject persistedObject)
   at Microsoft.SharePoint.Administration.SPPersistedObject.Delete()
   at Microsoft.SharePoint.Administration.SPJobDefinition.Delete()
   at EmployeeDemo.Features.DeleteEmpFeature.DeleteEmpFeatureEventReceiver.DeleteJob(SPSite site)
   at EmployeeDemo.Features.DeleteEmpFeature.DeleteEmpFeatureEventReceiver.FeatureDeactivating(SPFeatureReceiverProperties properties)
   at Microsoft.SharePoint.SPFeature.DoActivationCallout(Boolean fActivate, Boolean fForce)

Answer 1

要删除作业，请使用powershell：

$jobToDelete = Get-SPTimerJob -WebApplication "http://intranet" -Identity "YourJobName"
$jobToDelete.Delete()

然后运行：

iisreset /noforce

在配置数据库中，您需要授予这些权限以使删除工作：

use [Sharepoint_Config]
GO
GRANT EXECUTE ON [dbo].[proc_putObjectTVP] TO [WSS_Content_Application_Pools]
GRANT EXECUTE ON [dbo].[proc_putObject] TO [WSS_Content_Application_Pools]
GRANT EXECUTE ON [dbo].[proc_putDependency] TO [WSS_Content_Application_Pools]
GRANT EXECUTE ON [dbo].[proc_putClass] TO [WSS_Content_Application_Pools]
GRANT EXECUTE ON [dbo].[proc_getNewObjects] TO [WSS_Content_Application_Pools]
GRANT EXECUTE ON [dbo].[proc_dropObject] TO [WSS_Content_Application_Pools]
GO