private void ShowInfo(int _id)
        {
            BLL.cityinfo bll = new BLL.cityinfo();
            Model.cityinfo model = bll.GetModel(_id);

            ddlParentId.SelectedValue = model.parent_id.ToString();
            txtCallIndex.Text = model.call_index;
            txtTitle.Text = model.title;
            txtSortId.Text = model.sort_id.ToString();
            txtSeoTitle.Text = model.seo_title;
            txtSeoKeywords.Text = model.seo_keywords;
            txtSeoDescription.Text = model.seo_description;
            txtLinkUrl.Text = model.link_url;
            txtImgUrl.Text = model.img_url;
            txtContent.Value = model.content;
        }
        private bool DoEdit(int _id)
        {
            try
            {
                BLL.cityinfo bll = new BLL.cityinfo();
                Model.cityinfo model = bll.GetModel(_id);
                int parentId = int.Parse(ddlParentId.SelectedValue);

                model.channel_id = this.channel_id;
                model.call_index = txtCallIndex.Text.Trim();
                model.title = txtTitle.Text.Trim();
                //如果选择的父ID不是自己,则更改
                if (parentId != model.id)
                {
                    model.parent_id = parentId;
                }
                model.sort_id = int.Parse(txtSortId.Text.Trim());
                model.seo_title = txtSeoTitle.Text;
                model.seo_keywords = txtSeoKeywords.Text;
                model.seo_description = txtSeoDescription.Text;
                model.link_url = txtLinkUrl.Text.Trim();
                model.img_url = txtImgUrl.Text.Trim();
                model.content = txtContent.Value;
                if (!bll.Update(model))
                {
                    return false;
                }
            }
            catch
            {
                return false;
            }
            return true;
        }