C#使用HttpClient获取IP地址位置和网络信息

/// <summary>
/// C#使用HttpClient获取IP地址位置和网络信息， 如：广东省珠海市 电信
/// </summary>
/// <param name="ipAddress"></param>
/// <returns></returns>
private static string GetIpLocationFromPCOnline(string ipAddress)
{
    string ipLocation = "未知";
    try
    {
        var res = "";
        using (var client = new HttpClient())
        {
            var URL = "http://whois.pconline.com.cn/ip.jsp?ip=" + ipAddress;
            var response = client.GetAsync(URL).GetAwaiter().GetResult();
            response.EnsureSuccessStatusCode();
            res = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
        }
        if (!string.IsNullOrEmpty(res))
        {
            ipLocation = res.Trim();
        }
    }
    catch
    {
        ipLocation = "未知";
    }
    return ipLocation;
}