/// <summary>
        /// 删除信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            //获取鼠标选择的索引
            int num = dgUsers.SelectedIndex;

            if (num < 0)
            {
                MessageBox.Show("请选择要删除的行!");
            }
            else
            {
                //获取选中行
                RecordData user = (RecordData)dgUsers.SelectedValue;
                if (MessageBox.Show("是否删除" + user.Name + "的信息", "提示", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
                {
                    //删除数据
                    if (bll.Delete(user.ID, 0))
                    {
                        MessageBox.Show("删除" + user.Name.Trim() + "成功");
                    }
                }
                //加载数据
                LoadData();
            }
        }