2

我正在使用每隔几分钟运行的计时器作业为共享点站点做一个简单的新闻导入器。如果我在 Web 部件中运行下面的代码，它运行良好，但在计时器作业的 Execute 方法中运行时抛出 MissingMethodException。

完整的例外：

System.MissingMethodException was unhandled by user code
  Message="No parameterless constructor defined for this object."
  Source="mscorlib"
  StackTrace:
       at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
       at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
       at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
       at System.Activator.CreateInstance(Type type, Boolean nonPublic)
       at System.Activator.CreateInstance(Type type)
       at Microsoft.SharePoint.WebPartPages.SPWebPartSerializer.get_DefaultControl()
       at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Serialize(PersonalizationScope scope)
       at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.get_Links()
       at Microsoft.SharePoint.WebPartPages.SPWebPartManager.AddWebPartToStore(WebPart webPart, Int32 viewId, String viewGuid)
       at Microsoft.SharePoint.WebPartPages.SPWebPartManager.AddWebPartInternal(SPSupersetWebPart superset, Boolean throwIfLocked)
       at Microsoft.SharePoint.WebPartPages.SPLimitedWebPartManager.AddWebPartInternal(WebPart webPart, String zoneId, Int32 zoneIndex, Boolean throwIfLocked)
       at Microsoft.SharePoint.WebPartPages.SPLimitedWebPartManager.AddWebPart(WebPart webPart, String zoneId, Int32 zoneIndex)
       at Microsoft.SharePoint.Publishing.PublishingPage.CopyAllWebParts(String destinationPageUrlServerRelative, SPWeb destinationPageWeb, String sourcePageUrlServerRelative, SPWeb sourcePageWeb, Boolean shouldOverwriteDestinationWebParts)
       at Microsoft.SharePoint.Publishing.PublishingPageCollection.<>c__DisplayClass5.<Add>b__0()
       at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock)
       at Microsoft.Office.Server.Diagnostics.ULS.SendWatsonOnExceptionTag(ULSTagID tagID, ULSCat categoryID, String output, Boolean fRethrowException, TryBlock tryBlock, CatchBlock catchBlock, FinallyBlock finallyBlock)
       at Microsoft.SharePoint.Publishing.PublishingPageCollection.Add(String name, PageLayout layout)
       at Virtua.SharePoint.Mercator.NewsImportJob.Execute(Guid contentDbId)
       at Microsoft.SharePoint.Administration.SPTimerJobInvoke.Invoke(TimerJobExecuteData& data, Int32& result)
  InnerException:

编码：

var SPWebUri = new Uri("http://.../News/");
using (SPSite site = new SPSite(SPWebUri.AbsoluteUri))
{
    using (SPWeb web = site.OpenWeb(SPWebUri.AbsolutePath)) // tried 0x29A's anwser, but it didn't work
    // using (SPWeb web = site.OpenWeb())
    {
        web.AllowUnsafeUpdates = true;

        PublishingWeb publishingWeb = PublishingWeb.GetPublishingWeb(web);
        SPContentTypeId contentTypeId = new SPContentTypeId("...");

        PageLayout layout = publishingWeb.GetAvailablePageLayouts(contentTypeId).First(l => l.Name == "....aspx");
        PublishingPageCollection pages = publishingWeb.GetPublishingPages();

        var spFilename = "testing";

        // error line below
        var newPage = pages.Add(String.Format("{0}.aspx", spFilename), layout);

        // set newPage's fields

        // check-in and publish page
    }
}
4

2 回答 2

1

不确定但是否需要为 site.OpenWeb() 提供 url 参数 如果 url 参数为空，则必须打开顶级站点。这可以解释为什么它在 Web 部件中起作用，而不是在计时器作业中起作用。有关详细信息，请参阅MSDN - Site.OpenWeb 方法。

问候

于 2010-09-21T15:26:31.420 回答
0

问题是我的页面布局上有一个错误的 Web 部件。我SPContext.Current...在构造函数中使用。现在，显然，SPContext在执行计时器作业代码时，东西就不存在了（也不那么令人惊讶）。

由于错误未得到处理，Web 部件管理器尝试将我的部件替换为ErrorWebPart（通常告诉用户出现问题的部件）。出于某种原因，这在浏览器中显示页面时效果很好。但在计时器作业中，SharePoint 尝试使用未定义的无参数构造函数ErrorWebPart通过反射创建，整个事情只是用.ErrorWebPartMissingMethodException

将有问题的代码移动到CreateChildControls方法（我有错误处理的地方）解决了这个问题。

于 2010-09-27T11:02:48.053 回答