private void btnTest_Click(object sender, EventArgs e) { var servername = txtServer.Text.Trim(); var uid = txtUser.Text.Trim(); var pwd = txtPwd.Text.Trim(); var constr = service.GetConnectioning(servername, uid, pwd); if (service.ConnectionTest(constr)) { MessageBox.Show("连接数据库成功!"); comboBox1.DataSource = service.GetDBNameList(constr); } else { MessageBox.Show("连接数据库失败!"); } }