XDocument解析但无法从字符串中搜索

时间:2010-02-03 21:39:40

标签: linq-to-xml

我从一个看起来像这样的网站返回一个字符串

<?xml version=\"1.0\" encoding=\"UTF-8\"?><searchResponse requestID=\"500\" status=\"success\"><pso><psoID ID=\"61F2C644-F93A-11DE-8015-73A11AB14291\" targetID=\"mezeoAccount\"><data><email>sholobfc@bluefire.com.au</email><quotaMeg>2048</quotaMeg><quotaUsed>1879736</quotaUsed><active>true</active><unlocked>true</unlocked><allowPublic>true</allowPublic><realm>mezeo</realm><bandwidthQuota>1000000000</bandwidthQuota><billingDay>1</billingDay></data></psoID></pso></searchResponse>"

然后我尝试从中创建一个XDocument,以便我可以枚举元素

XDocument doc = new XDocument();
doc = XDocument.Parse(respStr);

但如果我每次都查询元素或后代,则返回null。我不能去

string s = doc.Element("email").Value;
// or
doc.Descendants("data"); // returns null as well

XDocument.Parse不会返回错误,但我似乎没有可搜索的xDocument。

任何人都可以看到我正在做的事情明显错误吗?

1 个答案:

答案 0 :(得分:1)

在调用XDocument.Parse之前,您不需要创建新的XDocument。这不会造成任何问题,这是毫无意义的。

但是,这行是错误的,因为电子邮件不是文档根目录的子代:

doc.Element("email").Value;

你的第二个例子看起来不错。这对我有用:

string s = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><searchResponse requestID=\"500\" status=\"success\"><pso><psoID ID=\"61F2C644-F93A-11DE-8015-73A11AB14291\" targetID=\"mezeoAccount\"><data><email>sholobfc@bluefire.com.au</email><quotaMeg>2048</quotaMeg><quotaUsed>1879736</quotaUsed><active>true</active><unlocked>true</unlocked><allowPublic>true</allowPublic><realm>mezeo</realm><bandwidthQuota>1000000000</bandwidthQuota><billingDay>1</billingDay></data></psoID></pso></searchResponse>";
XDocument doc = XDocument.Parse(s);
foreach (XElement e in doc.Descendants("data"))
    Console.WriteLine(e);

结果:

<data>
  <email>sholobfc@bluefire.com.au</email>
  <quotaMeg>2048</quotaMeg>
  <quotaUsed>1879736</quotaUsed>
  <active>true</active>
  <unlocked>true</unlocked>
  <allowPublic>true</allowPublic>
  <realm>mezeo</realm>
  <bandwidthQuota>1000000000</bandwidthQuota>
  <billingDay>1</billingDay>
</data>

回应你的第二个第三个问题(见这个答案的评论)试试这个:

using System;
using System.Xml.XPath;
using System.Xml.Linq;

class Program
{
    public static void Main()
    {
        string xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><searchResponse requestID=\"500\" status=\"success\"><pso><psoID ID=\"61F2C644-F93A-11DE-8015-73A11AB14291\" targetID=\"mezeoAccount\"><data><email>sholobfc@bluefire.com.au</email><quotaMeg>2048</quotaMeg><quotaUsed>1879736</quotaUsed><active>true</active><unlocked>true</unlocked><allowPublic>true</allowPublic><realm>mezeo</realm><bandwidthQuota>1000000000</bandwidthQuota><billingDay>1</billingDay></data></psoID></pso></searchResponse>";
        XDocument doc = XDocument.Parse(xml);
        foreach (XElement e in doc.XPathSelectElements("/searchResponse/pso/psoID/data/*"))
                Console.WriteLine(e);
    }
}

输出:

<email>sholobfc@bluefire.com.au</email>
<quotaMeg>2048</quotaMeg>
<quotaUsed>1879736</quotaUsed>
<active>true</active>
<unlocked>true</unlocked>
<allowPublic>true</allowPublic>
<realm>mezeo</realm>
<bandwidthQuota>1000000000</bandwidthQuota>
<billingDay>1</billingDay>