如何将地址框文本转换为地理位置较长的纬度。 在wp7中

这是我从MSDN回来的一些代码。 添加地址文本框，然后使用“查找”按钮搜索地图。

 <TextBox Height="23" Name="txt_address" Width="84" /> <Button Content="Find" Height="23" Margin="0 0 5 0" Name="btn_Find" Width="64" Click="btn_Find_Click" /> 

按钮点击事件;

 private void btn_Find_Click(object sender, RoutedEventArgs e) { FindAndDisplayNearbyPOI(Geocode(txt_address.Text)); } public XmlDocument Geocode(string addressQuery) { string BingMapsKey = "You bing key"; string geocodeRequest = "http://dev.virtualearth.net/REST/v1/Locations/" + addressQuery + "?o=xml&key=" + BingMapsKey; XmlDocument geocodeResponse = GetXmlResponse(geocodeRequest); return geocodeResponse; } private XmlDocument GetXmlResponse(string requestURL) { HttpWebRequest request = WebRequest.Create(requestURL) as HttpWebRequest; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { if (response.StatusCode != HttpStatusCode.OK) throw new Exception(String.Format("server error (HTTP {0}: {1}).", response.StatusCode, response.StatusDescription)); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(response.GetResponseStream()); return xmlDoc; } } private Microsoft.Maps.MapControl.WPF.Location FindAndDisplayNearbyPOI(XmlDocument xmlDoc) { Microsoft.Maps.MapControl.WPF.Location pushpin = new Microsoft.Maps.MapControl.WPF.Location(); // Create namespace manager XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable); nsmgr.AddNamespace("rest", "http://schemas.microsoft.com/search/local/ws/rest/v1"); // Get all locations in the response and then extract the coordinates for the top location XmlNodeList locationElements = xmlDoc.SelectNodes("//rest:Location", nsmgr); if (locationElements.Count == 0) { //ErrorMessage.Visibility = Visibility.Visible; //ErrorMessage.Content = "The location you entered could not be geocoded."; } else { // Get the geocode points that are used for display (UsageType=Display) XmlNodeList displayGeocodePoints = locationElements[0].SelectNodes(".//rest:GeocodePoint/rest:UsageType[.='Display']/parent::node()", nsmgr); string latitude = displayGeocodePoints[0].SelectSingleNode(".//rest:Latitude", nsmgr).InnerText; string longitude = displayGeocodePoints[0].SelectSingleNode(".//rest:Longitude", nsmgr).InnerText; pushpin = AddPushpinToMap(Convert.ToDouble(latitude), Convert.ToDouble(longitude), "Cust"); map1.Center = new Microsoft.Maps.MapControl.WPF.Location(Convert.ToDouble(latitude), Convert.ToDouble(longitude)); map1.ZoomLevel = 12; } return pushpin; } private Microsoft.Maps.MapControl.WPF.Location AddPushpinToMap(double latitude, double longitude, string pinLabel) { Microsoft.Maps.MapControl.WPF.Location location = new Microsoft.Maps.MapControl.WPF.Location(latitude, longitude); Microsoft.Maps.MapControl.WPF.Pushpin pushpin = new Microsoft.Maps.MapControl.WPF.Pushpin(); pushpin.Content = pinLabel; pushpin.Location = location; map1.Children.Add(pushpin); return pushpin.Location; }