sharepoint - 如何在工作流事件 (SharePoint) 中获取上下文项

Question

我正在为 sharepoint 工作流编写自定义事件，但我不知道如何使用当前的工作流项目、SPWeb 或 SPSite。

我看到http://blogs.microsoft.co.il/blogs/davidbi/archive/2008/07/21/How-to-get-the-context-item-in-workflow-activity-sharepoint.aspx但是这个解决方案的 xml 例程对我来说太糟糕了。

也许还有另一种纯代码解决方案来获取工作流事件中的上下文项？

Answer 1

这个问题的答案是几个步骤:

将属性添加到您的自定义事件 .cs

链接您的 .actions 文件中的属性(因此 SPD 知道如何映射到您的属性)

使用代码中的属性

第 1 步 :这是属性的代码(我的类名为 GetEmails，您需要将其重命名为您的类):

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);
    }
}

第 2 步 :然后在您的 .actions 文件中将这些属性的映射添加到您的块中(注意 __ListID、__ListItem、__Context 和 __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>

第 3 步 :
下面是一个执行函数的例子:

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;
}