/// <summary>
/// Find Entity Group Id
/// </summary>
/// <param name="trans"></param>
/// <param name="dbObject"></param>
/// <returns></returns>
public static ObjectId FindEntityGroupId(Transaction trans, DBObject dbObject)
{
var col = dbObject.GetPersistentReactorIds();
if (col != null)
{
foreach (ObjectId id in col)
{
using (DBObject obj = trans.GetObject(id, OpenMode.ForRead))
{
if (obj is Group)
{
return(obj.ObjectId);
}
}
}
}
return(ObjectId.Null);
}
/// <summary>
/// 获取实体对象所在的组
/// </summary>
/// <param name="entId">实体的Id</param>
/// <returns>返回实体所在的组</returns>
public static IEnumerable <ObjectId> GetGroups(this ObjectId entId)
{
DBObject obj = entId.GetObject(OpenMode.ForRead);//打开实体
//获取实体对象所拥有的永久反应器（组也属性永久反应器之一）
ObjectIdCollection ids = obj.GetPersistentReactorIds();
if (ids != null && ids.Count > 0)
{
//对实体的永久反应器进行筛选，只返回组
var groupIds = from ObjectId id in ids
//获取永久反应器对象
let reactor = id.GetObject(OpenMode.ForRead)
//筛选条件设置为Group类
where reactor is Group
select id;
if (groupIds.Count() > 0) //如果实体属于组
{
return(groupIds); //返回实体所在组的ObjectId
}
}
return(null);//没有组，则返回空值
}
