c# - XDocument 节点中的 Foreach

Question

<tests>
  <test id ="1">
    <name> peter </name>
    <age> 23 </age>
    <informations> bla bla </informations>
  </test>
  <test id ="41">
    <name> besd </name>
    <age> 54 </age>
    <informations> some other text </informations>
  </test>
  <test id ="57">
    <name> john </name>
    <age> 61 </age>
    <informations> vintage </informations>
  </test>
  <test id ="67">
    <name> claude </name>
    <age> 11 </age>
    <informations> motivation </informations>
  </test>
</tests>

我设法在 XDocument xInformations 中获取了上述所有信息。

  List<string> testIds = new List<string>();
  testIds = xInformations.Descendants("test").Select(x => (string)x.Attribute("id")).ToList();

现在，我想使用 foreach 来读取并保存每个 id 的所有信息:

foreach (string extId in testIds.Distinct())
{
     /// how can I take step by step the name, age, informations for all test cases ?
}

我怎样才能做到这一点？

Answer 1

创建匿名(或引入自己的类)实例并在foreach 循环中使用它

var tests = xInformations.Descendants("test")
                         .Select(x => 
                         {
                             new 
                             {
                                 Id = x.Attribute("id")?.Value,
                                 Name = x.Element("name").Value,
                                 Age = x.Element("age").Value,
                                 Info = x.Element("informations").Value
                             }
                         });

foreach(var test in tests)
{
    // test.Id
    // test.Name
    // test.Age
    // test.Info       
}

或者如果 xml 文件的架构保持不变，您可以使用更清晰的代码和 XmlSerializer

[XmlType("tests")]
public class Tests
{
    public List<Test> Tests { get; set; }
}

[XmlType("test")]
public class Test
{
    [XmlAttribute("id")]
    public int Id { get; set; }
    [XmlElement("name")]
    public string Name { get; set; }
    [XmlElement("age")]
    public int Age { get; set; }
    [XmlElement("informations")]
    public string Info { get; set; }
}

var serializer = new XmlSerializer(typeof(Tests));
Tests tests = null;
using (var reader = new StreamReader(pathToXmlFile))
{
    tests = (Tests)serializer.Deserialize(reader);
}

// use tests for your needs
foreach(var test in tests.Tests)
{
    // test.Id
}