刪除計時器作業時，它將引發錯誤“對象引用未設置為對象的實例”

Question

我用以下代碼創建了一個計時器作業：

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，我創建了一個站點范圍內的功能。 在其事件接收器中，在停用時，我具有以下代碼：

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();
        }
    }
}

但這使我出錯。 通過調試，我了解到該錯誤是在行job.Delete();上拋出的job.Delete(); 。 錯誤是：

你調用的對象是空的。

語句job.Name會讓我感到困惑， job.Name可以完美執行，甚至為我提供正確的計時器作業對象。 但是，在嘗試刪除作業時，會引發我錯誤。

我發現這個問題與我的問題類似，但建議對我不起作用。 在此討論中，我嘗試通過在SPSecurity.RunWithElevatedPrivileges編寫刪除代碼來進行SPSecurity.RunWithElevatedPrivileges但對我而言仍然無效。

有誰知道為什么會這樣以及如何解決呢？

更新1

更多細節。

用戶代碼未處理NullReferenceException

你調用的對象是空的。

這是堆棧跟蹤

   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

要刪除作業，請使用powershell：

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

然后運行：

iisreset /noforce

在配置數據庫中，您需要授予這些權限以使刪除工作：

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