不允许用户删除 Sharepoint 2007 中的列表

Question

我有一个包含多个项目的列表。当存在正在运行工作流程的项目时，我不希望用户删除列表。我试图避免孤立的工作流程，并更好地控制用户可以对列表中的数据执行的操作。

我已经实现了一个部分，通过实现 ItemDeleting 来拒绝用户删除正在运行的工作流中的单个项目。

/// <summary>
/// Synchronous before event that occurs before an existing item is completely deleted.
/// Business logic related to deleting items. Checks if there are any problems with deleting the list item.
/// If there are any problems with deleting then the event will be cancelled with an error message. Otherwise deletion is allowed
/// </summary>
/// <param name="properties">
/// A Microsoft.SharePoint.SPItemEventProperties object that represents properties of the event handler.
/// </param>
public override void ItemDeleting(SPItemEventProperties properties)
{
    SPListItem listItem = properties.ListItem;
    foreach (SPWorkflow workflow in listItem.Workflows)
    {
        if (workflow.InternalState == SPWorkflowState.Running)
        {
            properties.Cancel = true;
            properties.ErrorMessage = "It is not allowed to delete items with running workflows. Complete them before deleting";
        }
     }
 }

现在我想对列表本身执行相同的操作，但没有可用的 SPEventReceiverType 来完成我的任务。我已经在谷歌上搜索了一下，但没有运气。

有人为 Sharepoint 2007 做过这个吗？