如何获取工作流活动(SharePoint)中的上下文项

答案是几个步骤:

1. 将属性添加到自定义活动.cs
2. 链接.actions文件中的属性(以便spd知道如何映射到属性)
3. 使用代码中的属性

步骤1 :这是属性的代码(我的类名为getemails,您需要将其重命名为类):

public static DependencyProperty __ContextProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__Context", typeof(WorkflowContext), typeof(GetEmails));

[Description("The site context")]
[Category("User")]
[Browsable(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public WorkflowContext __Context
{
    get
    {
        return ((WorkflowContext)(base.GetValue(GetEmails.__ContextProperty)));
    }
    set
    {
        base.SetValue(GetEmails.__ContextProperty, value);
    }
}

public static DependencyProperty __ListIdProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__ListId", typeof(string), typeof(GetEmails));

[ValidationOption(ValidationOption.Required)]
public string __ListId
{
    get
    {
        return ((string)(base.GetValue(GetEmails.__ListIdProperty)));
    }
    set
    {
        base.SetValue(GetEmails.__ListIdProperty, value);
    }
}

public static DependencyProperty __ListItemProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__ListItem", typeof(int), typeof(GetEmails));

[ValidationOption(ValidationOption.Required)]
public int __ListItem
{
    get
    {
        return ((int)(base.GetValue(GetEmails.__ListItemProperty)));
    }
    set
    {
        base.SetValue(GetEmails.__ListItemProperty, value);
    }
}

public static DependencyProperty __ActivationPropertiesProperty = DependencyProperty.Register("__ActivationProperties", typeof(Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties), typeof(GetEmails));

[ValidationOption(ValidationOption.Required)]
public Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties __ActivationProperties
{
    get
    {
        return (Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties)base.GetValue(GetEmails.__ActivationPropertiesProperty);
    }
    set
    {
        base.SetValue(GetEmails.__ActivationPropertiesProperty, value);
    }
}

步骤2 :然后,在.actions文件中,将这些属性的映射添加到块中(注意u listid、u listem、u context和u activationproperties的条目):

<Action Name="[DESCRIPTION OF YOUR ACTION]"
  ClassName="[Your.Namespace.Goes.Here].GetEmails"
  Assembly="[yourDLLName], Version=1.0.0.0, Culture=neutral, PublicKeyToken=0bfc6fa4c4aa913b"
  AppliesTo="all"
  Category="[Your Category Goes Here]">
  <RuleDesigner Sentence="[blah blah blah]">
    <FieldBind Field="PeopleFieldName" Text="people field" Id="1"/>
    <FieldBind Field="Output" Text="emailAddress" Id="2" DesignerType="parameterNames" />
  </RuleDesigner>
  <Parameters>
    <Parameter Name="__Context" Type="Microsoft.SharePoint.WorkflowActions.WorkflowContext" Direction="In" />
    <Parameter Name="__ListId" Type="System.String, mscorlib" Direction="In" />
    <Parameter Name="__ListItem" Type="System.Int32, mscorlib" Direction="In" />
    <Parameter Name="PeopleFieldName" Type="System.String, mscorlib" Direction="In" />
    <Parameter Name="Output" Type="System.String, mscorlib" Direction="Out" />
    <Parameter Name="__ActivationProperties" Type="Microsoft.SharePoint.Workflow.SPWorkflowActivationProperties, Microsoft.SharePoint" Direction="Out" />
  </Parameters>
</Action>

步骤3 : 下面是一个执行函数示例:

protected override ActivityExecutionStatus Execute(ActivityExecutionContext provider)
{
    Output = string.Empty;

    try
    {
        SPWeb web = __Context.Web;
        // get all of the information we currently have about the item
        // that this workflow is running on
        Guid listGuid = new Guid(__ListId);
        SPList myList = web.Lists[listGuid];
        SPListItem myItem = myList.GetItemById(__ListItem);

        //...
    }
    catch (Exception e)
    {
        //...
    }

    return ActivityExecutionStatus.Closed;
}

我不确定这是否是2010 API中的一个更改,但是uuContext属性提供了所有必要的部分,包括列表和项。下面的示例包括@davek关于放弃安全上下文的建议:

            var contextWeb = __Context.Web;
            var site = new SPSite(contextWeb.Url);
            var web = site.OpenWeb();

            var list = web.Lists[new Guid(__Context.ListId)];
            var item = list.GetItemById( __Context.ItemId);

Kit Menke的回答非常全面,涵盖了你所需要的一切:我只想补充以下内容…

如果你这样做:

SPWeb tmpweb = __Context.Web;
SPSite site = new SPSite(tmpweb.Url);
SPWeb web = site.OpenWeb();

而不是这个:

SPWeb web = __Context.Web;
...

然后,您将不受触发工作流的人传递给工作流的安全上下文的约束。

看看 SPWorkflowActivationProperties.Item Property

获取正在其上运行工作流实例的列表项。

我尝试了这段代码并运行它,因为Contex对象总是空的。有人知道为什么?

protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
    {


        //return base.Execute(executionContext);
        int IdRetorno = -1;



        try {
            SPSecurity.RunWithElevatedPrivileges(delegate
            {
                LogExceptionToWorkflowHistory("Inicio:", executionContext, WorkflowInstanceId);
                using (SPSite sitio = new SPSite(this.__Context.Site.ID))
                {

                    using (SPWeb web = sitio.AllWebs[this.__Context.Site.ID])
                    {


                        SPList sourceList = web.Lists[new Guid(ListId)];
                        LogExceptionToWorkflowHistory(ListId, executionContext, WorkflowInstanceId);
                        SPList destinoList = web.Lists[new Guid(SourceListId)];
                        LogExceptionToWorkflowHistory(SourceListId, executionContext, WorkflowInstanceId);
                        SPListItem sourceItem = sourceList.Items.GetItemById(ListItem);
                        LogExceptionToWorkflowHistory(ListItem.ToString(), executionContext, WorkflowInstanceId);

                        SPListItem destinoItem = destinoList.Items.Add();
                        CopyFieldValues(sourceItem, destinoItem);
                        destinoItem.SystemUpdate();

                        sourceItem.Delete();
                        IdRetorno = destinoItem.ID;
                    }
                }

            });

        }
        catch (Exception ex) {
            if (!System.Diagnostics.EventLog.SourceExists("MyApp1"))
                System.Diagnostics.EventLog.CreateEventSource(
                   "MyApp1", "Application");

            EventLog EventLog1 = new EventLog();
            EventLog1.Source = "MyApp1";
            EventLog1.WriteEntry(ex.Message,EventLogEntryType.FailureAudit);

            LogExceptionToWorkflowHistory(ex.Message, executionContext, WorkflowInstanceId);
        }


        OutListItemID = IdRetorno;




        return base.Execute(executionContext);

    }

谢谢

我不知道这是否太简单,但我用了:

objCurrentItem = workflowProperties.Item

获取工作流(列表)中的项目,然后更改列表中的项目