/// <summary>
        /// 方法说明:加载产品树数据
        /// 作    者:jason.tang
        /// 完成时间:2013-03-05
        /// </summary>
        private void LoadPBomData()
        {
            if (tvPBOM.Nodes.Count > 0)
            {
                return;
            }

            //查找根节点(物料版本)下的子节点
            List <Model.MaterialVersionModule> versionModuleList =
                MaterialModuleBLL.GetMaterialVersionModuleList();

            if (versionModuleList.Count <= 0)
            {
                return;
            }


            versionModuleList.ForEach((o) =>
            {
                TreeNode root = new TreeNode();
                root.Text     = o.Name;
                root.ImageKey = "materialG";
                root.Tag      = o.MaterialVerId;
                root.Name     = o.BaseId;
                root.Expand();

                LoadPBomChildNode(root);

                tvPBOM.Nodes.Add(root);
            });
        }