C# Winform 域名得到(查询)(服务器所在) IP

public string GetIPByDomain(string url)
{
if (url.Trim() == string.Empty) return "";
try {
System.Net.IPHostEntry host = System.Net.Dns.GetHostEntry(url);
return host.AddressList.GetValue(0).ToString();
}
catch (Exception e) { throw e; }
}