private void BtnAdd_Click(object sender, EventArgs e)
        {
            var name = txtName.Text.Trim();
            var url  = txtUrl.Text.Trim();

            if (string.IsNullOrEmpty(name))
            {
                MessageBox.Show("名称不能为空");
                txtName.Focus();
                return;
            }

            if (string.IsNullOrEmpty(url))
            {
                MessageBox.Show("地址不能为空");
                txtUrl.Focus();
                return;
            }

            try
            {
                WeixinRobot robot = new WeixinRobot();
                robot.Name = name;
                robot.Url  = url;
                WeixinRobot.Insert(robot);
                LoadRobot();
            }
            catch (Exception ex)
            {
                MessageBox.Show("添加微信机器人失败:" + ex.ToString());
            }
        }