c# 遞歸函數使用案例

/// <summary>
/// 遞歸查詢
/// </summary>
/// <param name="groupID"></param>
/// <param name="idList"></param>
protected static void FindChildrenID(int groupID, StringBuilder idList)
{
// 這里是找孩子節點
var gLst = RepositoryFactory.Group.FindList(p => p.ParentID == groupID, "ID", false).ToList();
foreach (var item in gLst)
{

//判斷子節點是否存在，有則繼續
　　if (RepositoryFactory.Group.Find(p => p.ParentID == item.ID) != null)
　　return FindChildrenID(item.ID, idList);

idList.Append("|" + item.ID.ToString());
}
}