private void btnGetServerName_Click(object sender, EventArgs e)//只添加没有的项
{
opc.GetRomoteServer(txtRemoteServerIP.Text);
if (opc.ServerName.Count > 0)
{
foreach (string str in opc.ServerName)
{
if (!cmbServerName.Items.Contains(str))
{
cmbServerName.Items.Add(str);
}
}
}
}