Question

请帮助，我有xml文件，

<Users>
 <User FullName="" Name="sa">
  <userAvatarCache>-1</userAvatarCache>
  <description></description>
  <email></email>
  <phone></phone>
  <UserActive>true</UserActive>
 </User>

 <User FullName="asfgd" Name="stest">
  <userAvatarCache>-1</userAvatarCache>
  <description>aasad</description>
  <email>test@ukr.net</email>
  <phone>sdafdsfds0850</phone>
  <UserActive>true</UserActive>
 </User>
</Users>

我需要通过电子邮件选择 FullName 。我使用

获得了所有结构

 XmlDocument xmlDoc = new XmlDocument();
 xmlDoc.Load(res.GetResponseStream());
 XmlNode xmlNode = xmlDoc.DocumentElement.SelectSingleNode("User");

现在我只需要通过电子邮件发送1个结果（全名）。我怎么能做对吗？感谢

Answer 1

请google XPath，然后尝试使用它。请注意，对大文件使用XmlDocument是一个非常糟糕的主意。

代码：

    var rawXml = @"<Users>
                 <User FullName="""" Name=""sa"">
                  <userAvatarCache>-1</userAvatarCache>
                  <description></description>
                  <email></email>
                  <phone></phone>
                  <UserActive>true</UserActive>
                 </User>

                 <User FullName=""asfgd"" Name=""stest"">
                  <userAvatarCache>-1</userAvatarCache>
                  <description>aasad</description>
                  <email>test@ukr.net</email>
                  <phone>sdafdsfds0850</phone>
                  <UserActive>true</UserActive>
                 </User>
                </Users>";

     XmlDocument xmlDoc = new XmlDocument();
     xmlDoc.LoadXml(rawXml);
     string email = "test@ukr.net";
     string selector = string.Format("User[email=\"{0}\"]", email);
     XmlNode xmlNode = xmlDoc.DocumentElement.SelectSingleNode(selector);

     if(xmlNode != null)
     {      
        string fullName = xmlNode.Attributes["FullName"].Value;

        Console.WriteLine(fullName);
     }

Answer 2

XPath to select element based on childs child value非常清楚。

string xmlString = @"
 <Users>
  <User FullName='' Name='sa'>
   <userAvatarCache>-1</userAvatarCache>
   <description></description>
   <email></email>
   <phone></phone>
   <UserActive>true</UserActive>
  </User>
  <User FullName='asfgd' Name='stest'>
   <userAvatarCache>-1</userAvatarCache>
   <description>aasad</description>
   <email>test@ukr.net</email>
   <phone>sdafdsfds0850</phone>
   <UserActive>true</UserActive>
  </User>
 </Users>";

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlString);
XmlNode xmlNode = xmlDoc.DocumentElement.SelectSingleNode("./User[email = 'test@ukr.net']");

通过XmlDocument按子节点选择父节点

2 个答案: