Question

我创建了一个自定义计时器作业，并通过sharepoint中的功能事件实现了它。

当我试图激活它时，它显示了这个特殊的错误：

Object reference not set to an instance of an object.   at TimerJobExample.MyFeatureReceiver.FeatureActivated(SPFeatureReceiverProperties properties) in C:\Documents and Settings\admin-shuklag.INFRADEV\My Documents\Visual Studio 2008\Projects\TimerJobExample\TimerJobExample\MyFeatureReceiver.cs:line 22 
   at Microsoft.SharePoint.SPFeature.DoActivationCallout(Boolean fActivate, Boolean fForce) 
   at Microsoft.SharePoint.SPFeature.Activate(SPSite siteParent, SPWeb webParent, SPFeaturePropertyCollection props, Boolean fForce) 
   at Microsoft.SharePoint.SPFeatureCollection.AddInternal(Guid featureId, SPFeaturePropertyCollection properties, Boolean force, Boolean fMarkOnly) 
   at Microsoft.SharePoint.SPFeatureCollection.Add(Guid featureId) 
   at Microsoft.SharePoint.WebControls.FeatureActivator.BtnActivateFeature_Click(Object objSender, EventArgs evtargs) 
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e) 
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) 
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

错误行突出显示在下面

public override void FeatureActivated(SPFeatureReceiverProperties properties)
    {

        SPSite site = properties.Feature.Parent as SPSite;

        // make sure the job isn't already registered


//error line
      **foreach (SPJobDefinition job in site.WebApplication.JobDefinitions)**

        {

            if (job.Name == List_JOB_NAME)

                job.Delete();

        }



        SampleTimer listLoggerJob = new SampleTimer(List_JOB_NAME, site.WebApplication);

        SPMinuteSchedule schedule = new SPMinuteSchedule();

        schedule.BeginSecond = 0;

        schedule.EndSecond = 59;

        schedule.Interval = 5;

        listLoggerJob.Schedule = schedule;

        listLoggerJob.Update();

    }

可能是什么问题？

Answer 1

根据您的功能接收器，我只能看到两种可能性：

仔细检查feature.xml中的Scope属性是否设置为Site。如果设置为Web，则在尝试使用Object Reference not set变量时会出现site异常。
正如Janis所说，查看MyCustomJob构造函数。确保所有变量都已正确初始化。

Answer 2

问题在于功能的范围。它设置为Web，并且要在此级别激活功能，您需要管理员帐户或具有提升权限的帐户。

您可以将应用程序池ID添加到服务器场帐户或以提升的权限运行代码。

'激活功能'步骤错误：对象引用未设置为对象的实例

2 个答案: