private void btnAdd_Click(object sender, EventArgs e) { if (txtCodeName.Text.Trim() != null && txtCodeName.Text.Trim().Length == 6) { var code = txtCodeName.Text.Trim(); if (StockMarket.ValiCode(ref code)) { var name = StockMarket.GetCodeName(code); if (name != "") { AddItem(code, name); } else { MessageBox.Show("代码有误!"); } } } else { MessageBox.Show("输入错误!"); } }