//webclient客户端对象
WebClient client = new WebClient();
string url = "http://maps.google.com/maps/api/geocode/xml?latlng=" + latitude + "," + longitude + "&language=zh-CN&sensor=false";//请求地址
client.Encoding = Encoding.UTF8;//编码格式
string responseTest = client.DownloadString(url);
//下载xml响应数据
string address = "";//返回的地址
XmlDocument doc = new XmlDocument();
//创建XML文档对象
if (!string.IsNullOrEmpty(responseTest))
{
doc.LoadXml(responseTest);//加载xml字符串
//查询状态信息
string xpath = @"GeocodeResponse/status";
XmlNode node = doc.SelectSingleNode(xpath);
string status = node.InnerText.ToString();
if (status == "OK") {
//查询详细地址信息
xpath = @"GeocodeResponse/result/formatted_address";
node = doc.SelectSingleNode(xpath);
address = node.InnerText.ToString();
//查询地区信息
XmlNodeList nodeListAll = doc.SelectNodes("GeocodeResponse/result");

XmlNode idt = nodeListAll[0];
XmlNodeList idts = idt.SelectNodes("address_component[type='sublocality']");
//address_component[type='sublocality']表示筛选type='sublocality'的所有相关子节点；
XmlNode idtst = idts[0];

string area = idtst.SelectSingleNode("short_name").InnerText;
address = address + "," + area;
}
}