Sitecore事件 - 保存的項目引發TargetInvocation異常 - > IconChange

Question

我正在研究一種機制，根據對該項目的字段檢查進行更改和項目圖標。如果我檢查的Referencefield有一個targetItem，而targetItem有內容，我希望我要保存的項目的圖標被更改。這是我當前的代碼：

Sitecore.Data.Items.Item currentItem = Sitecore.Events.Event.ExtractParameter(args, 0) as Sitecore.Data.Items.Item; 

if (ValidForIconChange(currentItem)) 
{ 
    using (new EventDisabler()) 
    { 
     if (HelperClasses.SharedContentHelper.itemHasSharedContent(currentItem)) 
     { 
      currentItem.Editing.BeginEdit(); 
      currentItem.Appearance.Icon = "Applications/32x32/document_out.png"; 
      currentItem.Editing.EndEdit(); 
     } 
     else 
     { 
      currentItem.Editing.BeginEdit(); 
      currentItem.Appearance.Icon = currentItem.Template.Icon; 
      currentItem.Editing.EndEdit(); 
     } 
    } 

    RefreshScreen(currentItem);     
} 

和輔助功能：

/// <summary> 
    /// Checks if the item is valid to change the icon of the item 
    /// </summary> 
    /// <param name="currentItem">The current item.</param> 
    /// <returns></returns> 
    private static bool ValidForIconChange(Sitecore.Data.Items.Item currentItem) 
    { 
     return currentItem != null && ItemHelper.DoesItemImplementTemplate(currentItem, "_gedeelde inhoud") && currentItem.Language.Name == "nl-NL"; 
    } 

    /// <summary> 
    /// Refreshes the screen. 
    /// </summary> 
    /// <param name="currentItem">The current item.</param> 
    private void RefreshScreen(Sitecore.Data.Items.Item currentItem) 
    { 
     if (Sitecore.Context.ClientPage != null) 
     { 
      if (currentItem.Parent != null) 
      { 
       if (!currentItem.Editing.IsEditing) 
       { 
        //TODO: set to the appropriate item 
        String refresh = String.Format("item:refreshchildren(id={0})", currentItem.Parent.ID); 
        Sitecore.Context.ClientPage.SendMessage(this, refresh); 
       }          
      } 
     } 
    } 

目前我只是猜測了一下週圍就如何與此事件的工作。基本上，我試圖找出如何使用EventDisabler，因爲我想提出自己的事件來更新父母孩子，因爲我更改了圖標後，但是這會給我帶來麻煩，因爲我在發佈網站時。我想我必須知道何時使用發佈操作而不是單個項目保存。我只想在真正保存一個項目時而不是在發佈網站時觸發此代碼。發佈行爲導致以下錯誤（我以爲是因爲我停用事件，併發布事件後引發）：這裏

Job started: Publish to 'web'|Items created: 0|Items deleted: 0|Items updated: 1|Items skipped: 0|Job ended: Publish to 'web' (units processed: 1)|Job started: Publish to 'web'|#Exception: System.Reflection.TargetInvocationException: Het doel van een aanroep heeft een uitzondering veroorzaakt. ---> System.NullReferenceException: De objectverwijzing is niet op een exemplaar van een object ingesteld. 
    bij Sitecore.Web.UI.Sheer.ClientPage..ctor() 
    bij Sitecore.Context.get_ClientPage() 
    bij CommandTemplates.Classes.SharedContentIconChanger.RefreshScreen(Item currentItem) 
    bij CommandTemplates.Classes.SharedContentIconChanger.OnItemSaved(Object sender, EventArgs args) 
    bij Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters, EventResult result) 
    bij Sitecore.Events.Event.EventSubscribers.RaiseEvent(String eventName, Object[] parameters) 
    bij Sitecore.Events.Event.RaiseEvent(String eventName, Object[] parameters) 
    bij Sitecore.Events.Event.RaiseItemSaved(Object sender, ItemSavedEventArgs args) 
    bij Sitecore.Events.Event.DataEngine_ItemSaved(Object sender, ExecutedEventArgs`1 e) 
    bij System.EventHandler`1.Invoke(Object sender, TEventArgs e) 
    bij Sitecore.Data.Engines.EngineCommand`2.RaiseExecuted() 
    bij Sitecore.Data.Engines.EngineCommand`2.Executed() 
    bij Sitecore.Data.Engines.EngineCommand`2.Execute() 
    bij Sitecore.Data.Engines.DataEngine.SaveItem(Item item) 
    bij Sitecore.Data.Managers.ItemProvider.SaveItem(Item item) 
    bij Sitecore.Data.Managers.ItemManager.SaveItem(Item item) 
    bij Sitecore.Data.Items.ItemEditing.AcceptChanges(Boolean updateStatistics, Boolean silent) 
    bij Sitecore.Data.Items.ItemEditing.EndEdit(Boolean updateStatistics, Boolean silent) 
    bij Sitecore.Data.Items.EditContext.Dispose() 
    bij Sitecore.Publishing.PublishHelper.CopyToTarget(Item sourceVersion) 
    bij Sitecore.Publishing.PublishHelper.PublishVersionToTarget(Item sourceVersion, Item targetItem, Boolean targetCreated) 
    bij Sitecore.Publishing.PublishHelper.PublishVersion(Item sourceVersion) 
    bij Sitecore.Publishing.Pipelines.PublishItem.PerformAction.PublishVersion(PublishItemContext context) 
    bij Sitecore.Publishing.Pipelines.PublishItem.PerformAction.ExecuteAction(PublishItemContext context) 
    bij Sitecore.Publishing.Pipelines.PublishItem.PerformAction.Process(PublishItemContext context) 
    bij (Object , Object[]) 
    bij Sitecore.Pipelines.PipelineMethod.Invoke(Object[] parameters) 
    bij Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) 
    bij Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args, String pipelineDomain) 
    bij Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args) 
    bij Sitecore.Publishing.Pipelines.PublishItem.PublishItemPipeline.Run(PublishItemContext context) 
    bij Sitecore.Publishing.Pipelines.Publish.ProcessQueue.ProcessEntries(IEnumerable`1 entries, PublishContext context) 
    bij Sitecore.Publishing.Pipelines.Publish.ProcessQueue.Process(PublishContext context) 
    bij (Object , Object[]) 
    bij Sitecore.Pipelines.PipelineMethod.Invoke(Object[] parameters) 
    bij Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) 
    bij Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args, String pipelineDomain) 
    bij Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args) 
    bij Sitecore.Publishing.Pipelines.Publish.PublishPipeline.Run(PublishContext context) 
    bij Sitecore.Publishing.Publisher.PerformPublish() 
    bij Sitecore.Publishing.Publisher.Publish() 
    --- Einde van intern uitzonderingsstackpad --- 
    bij System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) 
    bij System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) 
    bij System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) 
    bij System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) 
    bij Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj) 
    bij Sitecore.Reflection.MethodInstance.Invoke() 
    bij Sitecore.Jobs.JobRunner.RunMethod(JobArgs args) 
    bij (Object , Object[]) 
    bij Sitecore.Pipelines.PipelineMethod.Invoke(Object[] parameters) 
    bij Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) 
    bij Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args, String pipelineDomain) 
    bij Sitecore.Jobs.Job.ThreadEntry(Object state) 

任何人有不同的方法或任何提示的想法？ 謝謝！

Answer 1

通過檢查wheter項目解決了這個問題：保存被出版或只是保存該項目名爲：

if(Sitecore.Context.Job != null &&Sitecore.Context.Job.Category == "publish") 
{ 
    // Do nothing 
} else { 
    // Change Icon code here`enter code here` 
} 

這樣你就可以判斷，如果你在發佈的理線是。