XDocument解析但无法从字符串中搜索 [英] XDocument parses but isnt searchable from string

问题描述

我从一个看起来像这样的网站上得到一个字符串

I'm getting a string returned from a website that looks like this

<?xml version=\"1.0\" encoding=\"UTF-8\"?><searchResponse requestID=\"500\" status=\"success\"><pso><psoID ID=\"61F2C644-F93A-11DE-8015-73A11AB14291\" targetID=\"mezeoAccount\"><data><email>[e-mail]</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，以便我可以通过元素进行枚举

I then try and create an XDocument from it so I can enumerate through the elements

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

但是如果我每次查询元素或后代时都返回null.我不能走

but if I query the elements or descendants everytime it returns null. I can't go

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

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

XDocument.Parse doesn't return an error, but I don't seem to have a searchable xDocument.

有人能看到我所做的事情明显有问题吗?

Can anyone see anything obviously wrong with what I am doing?

推荐答案

在调用XDocument.Parse之前不需要创建新的XDocument.这不会造成任何问题，只是没有意义.

You don't need to create a new XDocument before calling XDocument.Parse. This won't cause any problems, it's just pointless.

但是，此行是错误的，因为电子邮件不是文档根目录的子代:

However, this line is wrong because email is not a child of the document root:

doc.Element("email").Value;

您的第二个示例看起来不错.这对我有用:

Your second example looks fine. This works for me:

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>[e-mail]</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>[e-mail]</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>

针对您的第二个第三个问题(请参阅此答案的注释)，尝试以下操作:

In response to your second third question (see comments to this answer) try this:

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>[e-mail]</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>[e-mail]</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>

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