//webclient客戶端對象
WebClient client = new WebClient();
string url = "http://maps.google.com/maps/api/geocode/xml?latlng=" + latitude + "," + longitude + "&language=zh-CN&sensor=false";//請求地址
client.Encoding = Encoding.UTF8;//編碼格式
string responseTest = client.DownloadString(url);
//下載xml響應數據
string address = "";//返回的地址
XmlDocument doc = new XmlDocument();
//創建XML文檔對象
if (!string.IsNullOrEmpty(responseTest))
{
doc.LoadXml(responseTest);//加載xml字符串
//查詢狀態信息
string xpath = @"GeocodeResponse/status";
XmlNode node = doc.SelectSingleNode(xpath);
string status = node.InnerText.ToString();
if (status == "OK") {
//查詢詳細地址信息
xpath = @"GeocodeResponse/result/formatted_address";
node = doc.SelectSingleNode(xpath);
address = node.InnerText.ToString();
//查詢地區信息
XmlNodeList nodeListAll = doc.SelectNodes("GeocodeResponse/result");

XmlNode idt = nodeListAll[0];
XmlNodeList idts = idt.SelectNodes("address_component[type='sublocality']");
//address_component[type='sublocality']表示篩選type='sublocality'的所有相關子節點；
XmlNode idtst = idts[0];

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