c# - 解析这个 xml

Question

我尝试了很多代码，但没有任何效果。我有 XML:

<books>
    <book>
        <title>first title</title>
        <publisher>first publisher</publisher>
        <description>first description</description>
        <published>1410</published>
    </book>
    <book>
        <title>second book</title>
        <publisher>second publisher</publisher>
        <description>second description</description>
        <published>1914</published>
    </book>
    [another book]
    [another book2]
</books>

我想要这样的输入:

first title | first publisher | first description | 1410
second title | second publisher | second descirpion | 1914
[another books]

“我的”代码:

var xdoc = XDocument.Load(@"5.xml");
            var entries = from e in xdoc.Descendants("book")
                          select new
                          {
                              Title = (string)e.Element("title"),
                              Description = (string)e.Element("description")
                          };
//I DON'T KNOW WHAT IT DO, I FOUND THIS BUT I DON'T KNOW WHAT NEXT

我可以解析第一本书，但无法解析多本书。对不起语言。

Answer 1

如果您想使用 XDocument，您可以尝试以下操作:

using System;
using System.Xml.Linq;

class Program
{
    static void Main()
    {
        var doc = XDocument.Load("5.xml");
        var books = doc.Descendants("book");
        foreach (var book in books)
        {
            string title = book.Element("title").Value;
            string publisher = book.Element("publisher").Value;
            string description = book.Element("description").Value;
            string published = book.Element("published").Value;
            Console.WriteLine("{0}\t{1}\t{2}\t{3}", title, publisher, description, published);
        }
    }
}

另一方面，如果您尝试解析的 XML 非常大，无法放入内存，则最好使用 XmlReader，它允许您逐条记录地处理它:

using System;
using System.Xml;

class Program
{
    static void Main()
    {
        using (var reader = XmlReader.Create("5.xml"))
        {
            string title = null, publisher = null, description = null, published = null;
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "book")
                {
                    Console.WriteLine("{0}\t{1}\t{2}\t{3}", title, publisher, description, published);
                }

                if (reader.NodeType == XmlNodeType.Element && reader.Name == "title")
                {
                    title = reader.ReadInnerXml();
                }

                if (reader.NodeType == XmlNodeType.Element && reader.Name == "publisher")
                {
                    publisher = reader.ReadInnerXml();
                }

                if (reader.NodeType == XmlNodeType.Element && reader.Name == "description")
                {
                    description = reader.ReadInnerXml();
                }

                if (reader.NodeType == XmlNodeType.Element && reader.Name == "published")
                {
                    published = reader.ReadInnerXml();
                }
            }
        }
    }
}

使用这种方法，您可以处理任意大的 XML 文件。