Question

我有一个XML文件，结构如下：

<Definitions>
  <Definition Execution="Firstkey" Name="Somevalue"></Definition>
  <Definition Execution="Secondkey" Name="Someothervalue"></Definition>
</Definitions>

如何在我的.NET应用程序中使用C＃获取密钥的值（Firstkey，Secondkey）并将其写下来？

感谢。

Answer 1

使用Linq to XML这很简单。

要获得钥匙：

var keys = doc.Descendants("Definition")
              .Select(x => x.Attribute("Execution").Value);
foreach (string key in keys)
{
    Console.WriteLine("Key = {0}", key);
}

获取所有值：

XDocument doc = XDocument.Load("test.xml");
var definitions = doc.Descendants("Definition")
                     .Select(x => new { Execution = x.Attribute("Execution").Value,
                                        Name = x.Attribute("Name").Value });
foreach (var def in definitions)
{
    Console.WriteLine("Execution = {0}, Value = {1}", def.Execution, def.Name);
}

编辑以回复评论：

我认为你真正想要的是一个字典，它从一个键（“执行”）映射到一个值（“名称”）：

XDocument doc = XDocument.Load("test.xml");
Dictionary<string, string> dict = doc.Descendants("Definition")
                                     .ToDictionary(x => x.Attribute("Execution").Value, 
                                                   x => x.Attribute("Name").Value);
string firstKeyValue = dict["Firstkey"]; //Somevalue

Answer 2

使用XMLDocumnet / XMLNode：

//Load the XML document into memory
XmlDocument doc = new XmlDocument();
doc.Load("myXML.xml");

//get a list of the Definition nodes in the document
XmlNodeList nodes = doc.GetElementsByTagName("Definition");

//loop through each node in the XML
foreach (XmlNode node in nodes)
{
   //access the key attribute, since it is named Execution,
   //that is what I pass as the index of the attribute to get
   string key = node.Attributes["Execution"].Value;

   //To select a single node, check if we have the right key
   if(key == "SecondKey") //then this is the second node
   {
      //do stuff with it
   }
}

基本上你将xml加载到文档变量中，选择你想要查看的节点。然后迭代它们并存储相关信息。

Answer 3

using System.Xml.Linq;

var keys = XDocument.Load("path to the XML file")
.Root
.Elements()
.Select(x => x.Attribute("Execution"));

Answer 4

XPath将是一个很好的选择，我会说。

以下是XPath表达式示例。

//Definition[@Execution='Firstkey']/@Name

由于XPath表达式是一个字符串，您可以轻松地将“Firstkey”替换为您需要的任何内容。

使用XmlDocument.SelectSingleNode或XmlDocument.SelectNodes方法

上述两种方法都返回一个XmlNode。您可以轻松访问XmlNode.Value

Here are some XPath expressions

不要忘记XPath Visualizer，这使得使用XPath变得更加容易！

从C＃中的XML文件获取密钥的值

4 个答案: