计算 XML 文档中的父节点

Question

I am trying to count all the parent nodes in a XML Document. I have seen solutions like .SelectNodes("general/parent").Count but that is a fixed solution. The problem is that I must do it with a generated XML document. So I don't know the XML structure.

I created an example. Imagine that the following document is generated, without knowing any tag names or information at all:

<?xml version="1.0" encoding="UTF-8"?>
<general>
    <settings>
        <resolution>1920x1080</resolution>
        <version>1.0</version>
    </settings>
    <data>
        <persons>
            <person>
                <name>Bob</name>
                <age>41</age>
            </person>
            <person>
                <name>Alex</name>
                <age>25</age>
            </person>
        </persons>
    </data>
</general> 

I want to go through this document and have a result of: 5. As the document has 5 "parents" (general, settings, data, persons, and person). But it doesn't count "resolution", "version", "name" and "age" because they have no childs (are no parents). But once again, keep in mind that the document is generated!

I hope this question is clear enough. Is there a way of achieving this?

Answer 1

使用 LinqToXml，您可以执行以下操作：

XDocument.Parse(@"...").Descendants().Where(n => n.Elements().Any()).Select(n => n.Name).Distinct().Count();

Answer 2

You need a recursive algorithm, like this one;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace GetMaxXMLDepth
{
    class Program
    {
        static void Main(string[] args)
        {
            string doc = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<general>
    <settings>
        <resolution>1920x1080</resolution>
        <version>1.0</version>
    </settings>
    <data>
        <persons>
            <person>
                <name>Bob</name>
                <age>41</age>
            </person>
            <person>
                <name>Alex</name>
                <age>25</age>
            </person>
        </persons>
    </data>
</general>";
            var xd = XDocument.Parse(doc);

            int maxDepth = GetMaxChildDepth(xd.Root);
        }

        static int GetMaxChildDepth(XElement element)
        {
            int result = 1;

            //always return 1 as the root node has depth of 1.
            //in addition, return the maximum depth returned by this method called on all the children.
            if (element.HasElements)
                result += element.Elements().Max(p => GetMaxChildDepth(p));

            return result;
        }
    }
}

Answer 3

int count = ParentNode.SelectNodes(ChildNodesXPath).Count;