Windows Phone 8 C中的XML解析#

Question

我想从以下URL解析xml文件:" http://restservice.com/RestServiceImpl.svc/ghhf/cvr "

我可以使用以下代码获取XDocument:

private void Search(object sender, RoutedEventArgs e)
{
    string url = "http://restservice.schoolpundit.com/RestServiceImpl.svc/search_name/cvr";
    WebClient twitter = new WebClient();
    twitter.DownloadStringCompleted += new DownloadStringCompletedEventHandler(twitter_DownloadStringCompleted);
    twitter.DownloadStringAsync(new Uri(url));
}

void twitter_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    if (e.Error != null)
        return;
    XDocument doc = XDocument .Parse(e.Result);

    var list = from child in  doc.Descendants("Institutions_search_name")
               select new listrows {
                  inst_name=doc.Element("Inst_name").Value;
               };

     Listbox.ItemSource=list;
} 

但它没有显示任何Inst_name,实际上它没有进入doc.Descendants("institutions_search_name")它也没有显示任何异常.如果我做了任何错误纠正我.

Answer 1

我认为你只是错过了命名空间 - 尽管你也在调用doc.Element而不是child.Element.如果你看一下XML,你会在root元素中看到这个:

 xmlns="http://schemas.datacontract.org/2004/07/RestService"

这意味着没有明确指定名称空间的每个元素都在该名称空间中.

幸运的是,LINQ to XML使这很容易处理:

XNamespace ns = "http://schemas.datacontract.org/2004/07/RestService";
var list = from child in doc.Descendants(ns + "Institutions_search_name")
           select new listrows {
               inst_name=child.Element(ns + "Inst_name").Value
           };

虽然我可能在没有查询表达式的情况下这样做:

XNamespace ns = "http://schemas.datacontract.org/2004/07/RestService";
var list = doc.Descendants(ns + "Institutions_search_name")
              .Select(x => new listrows { 
                         inst_name = child.Element(ns + "Inst_name").Value
                      });

事实上,鉴于你只是选择一个字符串,我会摆脱这listrows一点:

XNamespace ns = "http://schemas.datacontract.org/2004/07/RestService";
var list = doc.Descendants(ns + "Institutions_search_name")
              .Select(x => child.Element(ns + "Inst_name").Value);

还要注意,listrows并inst_name违反.NET命名约定-这是值得尝试与这些公约相一致,使您的代码更容易给大家看了.