如何在Sharepoint 2010中从工作流事件处理程序中获取上下文

Question

我正在将我们的定制解决方案升级到Sharepoint 2010。我想利用WorkflowCompleted事件处理程序，但我似乎无法从事件属性中获得相关的SPListItem。

我尝试使用 spworkflowventproperties。ActivationProperties，但这总是返回null(即使在WorkflowStarted事件处理程序中)。

如何从工作流事件处理程序(SPListItem， SPWeb， SPSite等)中获取上下文?

Answer 1

我发现了同样的事情。spworkflowventproperties实际上是无用的，因为几乎所有东西都是空的。它不告诉状态(批准，拒绝等)。而且，最重要的是，它不会(直接)告诉你完成了哪个项目。希望这将在未来的版本中得到解决。同时，我使用了以下代码:

public override void WorkflowCompleted(SPWorkflowEventProperties properties)
{
   using (SPSite site = new SPSite(properties.WebUrl))
   {
       using (SPWeb web = site.OpenWeb())
       {
           SPListItem task = GetApprovedTask(properties, web);
           SPListItem item = GetApprovedItem(web, task);
           if (null != item)
           {
               // TODO : process approved item
           }
       }
   }
}
private SPListItem GetApprovedItem(SPWeb web, SPListItem task)
{
   SPListItem item = null;
   if (null != task)
   {
       SPList list = web.Lists[new Guid(task[SPBuiltInFieldId.WorkflowListId].ToString())];
       item = list.GetItemById((int)task[SPBuiltInFieldId.WorkflowItemId]);
   }
   return item;
}
private SPListItem GetApprovedTask(SPWorkflowEventProperties properties, SPWeb web)
{
   SPListItem item = null;
   string caml = @"<Where><And><And><And><Eq><FieldRef Name='WorkflowOutcome' /><Value Type='Text'>Approved</Value></Eq><Eq><FieldRef Name='WorkflowInstanceID' /><Value Type='Guid'>{0}</Value></Eq></And><IsNotNull><FieldRef Name='WorkflowListId' /></IsNotNull></And><IsNotNull><FieldRef Name='WorkflowItemId' /></IsNotNull></And></Where>";
   SPQuery query = new SPQuery();
   query.Query = string.Format(caml, properties.InstanceId);
   query.RowLimit = 1;
   SPList list = web.Lists["Tasks"];
   SPListItemCollection items = list.GetItems(query);
   if (items.Count > 0)
   {
       item = items[0];
   }
   return item;
}

Answer 2

您可以使用InstanceId属性从工作流任务列表中检索SPListItem，如本文所示

http://blog.symprogress.com/2011/09/sp - 2010 -让-工作流-状态- workflowcompleted event/

Answer 3

如果你能更慷慨地提供细节，我可以更具体地回答。

但这通常是你需要做的:

1. 设置特定于上下文的属性

   public static DependencyProperty _ContextProperty= System.Workflow.ComponentModel.DependencyProperty.Register(" _Context",typeof (WorkflowContext) typeof (MyCustomActivity));

[描述("网站背景")](类别("用户"))(可浏览的(真正的))[DesignerSerializationVisibility (DesignerSerializationVisibility.Visible)]

public WorkflowContext __Context
{
    get
    {
        return ((WorkflowContext)(base.GetValue(MyCustomActivity.__ContextProperty)));
    }
    set
    {
        base.SetValue(MyCustomActivity.__ContextProperty, value);
    }
}
public static DependencyProperty __ListIdProperty
    = System.Workflow.ComponentModel.DependencyProperty.Register("__ListId",
    typeof(string), typeof(MyCustomActivity));

[ValidationOption (ValidationOption.Required)]

public string __ListId
{
    get
    {
        return ((string)(base.GetValue(MyCustomActivity.__ListIdProperty)));
    }
    set
    {
        base.SetValue(MyCustomActivity.__ListIdProperty, value);
    }
}
public static DependencyProperty __ListItemProperty
    = System.Workflow.ComponentModel.DependencyProperty.Register("__ListItem",
    typeof(int), typeof(MyCustomActivity));

[ValidationOption (ValidationOption.Required)]

public int __ListItem
{
    get
    {
        return ((int)(base.GetValue(MyCustomActivity.__ListItemProperty)));
    }
    set
    {
        base.SetValue(MyCustomActivity.__ListItemProperty, value);
    }
}
public static DependencyProperty __ActivationPropertiesProperty
    = DependencyProperty.Register("__ActivationProperties",
    typeof(Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties), typeof(MyCustomActivity));

[ValidationOption (ValidationOption.Required)]

public Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties __ActivationProperties
{
    get
    {
        return (Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties)base.GetValue(MyCustomActivity.__ActivationPropertiesProperty);
    }
    set
    {
        base.SetValue(MyCustomActivity.__ActivationPropertiesProperty, value);
    }
}

1. 您将获得__Context的上下文和__Context的其他所有内容，如下所示:

   protected override ActivityExecutionStatus执行(ActivityExecutionContext) {//引发Invoke Event以执行工作流中的自定义代码。this.RaiseEvent (MyCustomActivity.InvokeEvent这个,EventArgs.Empty);

   SPWeb _cxtWeb = null;
   String _strLinfo = "Dll;";
   String _strTo = String.Empty;
   // Set Context
   try
   {
       SPSecurity.RunWithElevatedPrivileges(delegate()
       {
           using (_cxtWeb = __Context.Web)
           {
               //_cxtWeb = __Context.Web;
               Guid _cListId = new Guid(__ListId);
               SPList _cSPList = _cxtWeb.Lists[_cListId]; // TimeLog
               SPListItem _cListItem = _cSPList.GetItemById(__ListItem);
               SMTPSERVER = _cxtWeb.Site.WebApplication
                                           .OutboundMailServiceInstance.Server.Address;
           }
       });
   }
   catch { /**/ }
   

   }