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，下面的代码获取 XML 响应，但不知何故，当从 XML 响应分阶段处理值时它不起作用。

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>

最佳答案

我的解决方案是:

• 对结果 XML 运行 xsd.exe 实用程序两次，将其转换为 XSD(第一步)和 C# 类(第二步)- 这将为您提供一个 C# 类响应

• 接下来，您可以轻松地将响应反序列化为该类的一个实例:

  HttpWebRequest request = WebRequest.Create("http://api.ipinfodb.com/v2/ip_query.php?key=--yourkey--&ip=74.125.45.100&timezone=true") as HttpWebRequest;
  
  XmlSerializer ser = new XmlSerializer(typeof(Response));
  
  WebResponse response = request.GetResponse();
  var result = ser.Deserialize(response.GetResponseStream());
  

  现在您的result 将包含一个Response 的实例，所有元素都是您对象中的nice 字段。

在其 MSDN doc page 上阅读有关 xsd.exe 的更多信息.

关于c# - 使用 REST XML Web 服务，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/4689303/