c# 通过 linq to xml 调用值

Question

I'm learning about reading and retrieving data from XML files. I have xml like this:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="IK.xsl"?>
<IK>
    <Folders>
        <Folder>
            <name>nameA</name>
            <info>nazwa pierwsza</info>
            <komps>
               <K1 id="1">komp1</K1>
               <K1 id="2">komp2</K1>
               <K1 id="3">komp3</K1>
               <K1 id="4">komp4</K1>
               <K1 id="5">komp5</K1>
            </komps
        </Folder>
        <Folder>
            <name>nameB</name>
            <info>nazwa druga</info>
            <komps>
               <K1 id="1">komp1</K1>
               <K1 id="2">komp2</K1>
               <K1 id="3">komp3</K1>
               <K1 id="4">komp4</K1>
               <K1 id="5">komp5</K1>
            </komps
        </Folder>
        <Folder>
            <name>nameC</name>
            <info>nazwa trzecia</info>
            <komps>
               <K1 id="1">komp1</K1>
               <K1 id="2">komp2</K1>
               <K1 id="3">komp3</K1>
               <K1 id="4">komp4</K1>
               <K1 id="5">komp5</K1>
            </komps 
        </Folder>

    </Folders>
</IK>

and class

public class Foldery
{
    public Folder folder { get; set; }
}

public class Folder
{
    public string name { get; set; }
    public string info { get; set; }
    public Komps[] komps { get; set; }
        }

        public class Komps
        {
            public string K1 { get; set; }
        }
}

I want to put all Folders values into a list Folder objects using linq to xml? All the example which i found is for first level nodes and I don't know how to get to deeper level of xml and retrieve data from.

What about "komps" values which are another list of strings??

Answer 1

The XDocument class has a method called Descendants . It has an overload where you can provide an XName as a filter criteria for elements. Fortunately there is an implicit cast operator between string and XName .

So, in order to retrieve the Folder elements into a List you can use the following code:

//Retrieve and load the xml
using var fs = File.OpenRead("Sample.xml");
var reader = new StreamReader(fs);
var rawXml = reader.ReadToEnd();

//Parse the xml
var document = XDocument.Parse(rawXml);
var folders = document.Descendants("Folder")
    .Select(element => new Folder
    {
        Name = element.Element("name")?.Value,
        Info = element.Element("info")?.Value,
    }).ToList();

---

UPDATE : Providing an alternative

You can also filter for the Folders element and ask for its child nodes:

document.Descendants("Folders").Elements()

Answer 2

我设法使用循环和 komps 获取数据

var komps = item.Descendants("Folder").Descendants("komps").Descendants("K1");