我们如何在C语言中进行XML解析 [英] how we do XML parsing in C sharp

问题描述

请帮助我找到XML节点.
我的XML文件是:

please help me find node in XML.
my XML file is:

<?xml version="1.0" encoding="UTF-8"?>
<DistanceMatrixResponse>
 <status>OK</status>
 <origin_address>California, USA</origin_address>
 <destination_address>Louisiana, USA</destination_address>
 <row>
  <element>
   <status>OK</status>
   <duration>
    <value>110693</value>
    <text>1 day 7 hours</text>
   </duration>
   <distance>
    <value>3037646</value>
    <text>3,038 km</text>
   </distance>
  </element>
 </row>
</DistanceMatrixResponse>

我想要与该XML文件的距离.我正在使用此代码，但出现错误

I want distance from this XML file. I''m using this code but it gives error

XmlDocument xml = new XmlDocument();
  xml.LoadXml(tempString);  // suppose that str string contains "<Names>...</Names>"

//  XmlNodeList xnList = xml.SelectNodes("/DistanceMatrixResponse/text/[@type='distance']");

  XmlNode node = xml.SelectSingleNode("DistanceMatrixResponse/row/element/distance/text()");
  foreach (XmlNode xn in node)
  {
      Console.WriteLine(xn.InnerText);
  }

推荐答案

您的意思是:

Do you mean:

XmlDocument xml = new XmlDocument();
xml.Load("myfile.xml");

XmlNode node;
node = xml.SelectSingleNode("DistanceMatrixResponse/row/element/distance/text");

Console.WriteLine(node.InnerText);

?

使用以下代码读取Xml文件-

Use following code to read Xml file-

Now add namespace - using System.Xml;
on button click write code as-
XmlTextReader reader = new XmlTextReader("C:\\Users\\Dell\\Desktop\\New folder\\XMLFile1.xml");   //this will location and name of xml 
               while (reader.Read())
                {
                  switch (reader.NodeType)
                    {
                  case XmlNodeType.Element: // The node is an element.
                        MessageBox.Show("<" + reader.Name);
                       //MessageBox.Show(">");
                       //MessageBox.Show(reader.Value);
                        break;
                  case XmlNodeType.Text: //Display the text in each element.
                        MessageBox.Show(reader.Value);        
                        break;
                  case XmlNodeType.EndElement: //Display the end of the element.
                        //Console.Write("</" + reader.Name);
                        //MessageBox.Show(">");
                         break;
                     }
                  }

.NET Framework随附了用于解析XML的不同库类；请在下面查看我的概述:

The .NET Framework comes with different library classes used to parse XML; please see my overview of them below:

1. 使用System.Xml.XmlDocument类.它实现了DOM接口；如果文档太大，则这种方法最简单，也足够好.
   请参见
2. 使用类System.Xml.XmlTextReader; library/system.xml.xmldocument.aspx"target =" _ blank"title =" New Window> ^ ].
3. 使用类System.Xml.XmlTextReader;这是最快的读取方法，尤其是您需要跳过一些数据.
   请参见 http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx [ http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx [http://msdn.microsoft.com/en-us/library/bb387063.aspx [

1. Use System.Xml.XmlDocument class. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^].
2. Use the class System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx[^].
3. Use the class System.Xml.Linq.XDocument; this is the most adequate way similar to that of XmlDocument, supporting LINQ to XML Programming.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^], http://msdn.microsoft.com/en-us/library/bb387063.aspx[^].

—SA

—SA

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