我正在尝试使用以下Web服务
http://ipinfodb.com/ip_location_api.php
此Web服务返回一个xml响应,下面的代码可以获得XML响应,但是当从XML响应中分阶段处理时它不起作用.
此Web服务返回一个xml响应,下面的代码可以获得XML响应,但是当从XML响应中分阶段处理时它不起作用.
我的代码有什么问题？
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.IO;
using System.Net;
using System.Xml;
namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
HttpWebRequest request = null;
HttpWebResponse response = null;
String Xml;
// Create the web request
request = WebRequest.Create("http://api.ipinfodb.com/v2/ip_query.PHP?key=<yourkey>&ip=74.125.45.100&timezone=true") as HttpWebRequest;
// Get response
using (response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
Xml = reader.ReadToEnd();
}
// Console xml output
Console.WriteLine(Xml); //see if we get the xml response,(YES we do)
Console.ReadLine();
string _currentField = "";
StringReader _sr = new StringReader(Xml);
XmlTextReader _xtr = new XmlTextReader(_sr);
_xtr.XmlResolver = null;
_xtr.WhitespaceHandling = WhitespaceHandling.None;
// get the root node
_xtr.Read();
if ((_xtr.NodeType == XmlNodeType.Element) && (_xtr.Name == "Response"))
{
while (_xtr.Read())
{
if ((_xtr.NodeType == XmlNodeType.Element) && (!_xtr.IsEmptyElement))
{
_currentField = _xtr.Name;
_xtr.Read();
if (_xtr.NodeType == XmlNodeType.Text)
{
switch (_currentField)
{
case "Status":
Console.WriteLine(_xtr.Value); //we print to console for testing purposes,normally assign it to a variable here!
break;
case "CountryCode":
Console.WriteLine(_xtr.Value);
break;
case "CountryName":
Console.WriteLine(_xtr.Value);
break;
case "RegionCode":
Console.WriteLine(_xtr.Value);
break;
case "RegionName":
Console.WriteLine(_xtr.Value);
break;
case "City":
Console.WriteLine(_xtr.Value);
break;
case "ZipPostalCode":
Console.WriteLine(_xtr.Value);
break;
case "Latitude":
Console.WriteLine(_xtr.Value);
break;
case "Longitude":
Console.WriteLine(_xtr.Value);
break;
case "Gmtoffset":
Console.WriteLine(_xtr.Value);
break;
case "Dstoffset":
Console.WriteLine(_xtr.Value);
break;
case "TimezoneName":
Console.WriteLine(_xtr.Value);
break;
case "Isdst":
Console.WriteLine(_xtr.Value);
break;
case "Ip":
Console.WriteLine(_xtr.Value);
break;
default:
// unknown field
throw new Exception("Unknown field in response.");
}
}
}
}
}
Console.ReadLine();
}
}
}
编辑：这是返回的XML响应
<?xml version="1.0" encoding="UTF-8" ?> - <Response> <Status>OK</Status> <CountryCode>US</CountryCode> <CountryName>United States</CountryName> <RegionCode>06</RegionCode> <RegionName>California</RegionName> <City>Mountain View</City> <ZipPostalCode>94043</ZipPostalCode> <Latitude>37.4192</Latitude> <Longitude>-122.057</Longitude> <Gmtoffset>-28800</Gmtoffset> <Dstoffset>0</Dstoffset> <TimezoneName>America/Los_Angeles</TimezoneName> <Isdst>0</Isdst> <Ip>74.125.45.100</Ip> </Response>
解决方法
我使用这个相同的API,我将响应XML加载到
XDocument中,并解析例如.
// build URL up at runtime
string apiKey = ConfigurationManager.AppSettings["geoApiKey"];
string url = String.Format(ConfigurationManager.AppSettings["geoApiUrl"],apiKey,ip);
WebRequest request = WebRequest.Create(url);
try
{
WebResponse response = request.GetResponse();
using (var sr = new System.IO.StreamReader(response.GetResponseStream()))
{
XDocument xmlDoc = new XDocument();
try
{
xmlDoc = XDocument.Parse(sr.ReadToEnd());
string status = xmlDoc.Root.Element("Status").Value;
Console.WriteLine("Response status: {0}",status);
if (status == "OK")
{
// if the status is OK it's normally safe to assume the required elements
// are there. However,if you want to be safe you can always check the element
// exists before retrieving the value
Console.WriteLine(xmlDoc.Root.Element("CountryCode").Value);
Console.WriteLine(xmlDoc.Root.Element("CountryName").Value);
...
}
}
catch (Exception)
{
// handle if necessary
}
}
}
catch (WebException)
{
// handle if necessary
}
您还应该做的是引入一个自定义类,例如GeoLocationInfo并将您的代码包含在函数中. GetGeoLocation(string ip),而不是将信息写入控制台窗口,您可以填充&返回该类的实例.
