查看以下示例：

使用System; 
使用System.Collections.Generic; 
使用System.Windows.Forms; 
使用System.Xml; 
使用System.IO; 

命名空间WindowsFormsApplicationCS 
 {
 public partial class Form8：Form 
 {
 public Form8（）
 {
 InitializeComponent（） ; 
} 

 private void button1_Click（object sender，EventArgs e）
 {
 XmlDocument xmldoc = new XmlDocument（）; 
 XmlNodeList xmlnode; 
 int i = 0; 
 List< string> listx = new List< string>（）; 

 FileStream fs = new FileStream（XMLFILE1.xml，FileMode.Open，FileAccess.Read）; 
 xmldoc.Load（fs）; 
 xmlnode = xmldoc.GetElementsByTagName（Point）; 
 for（i = 0; i< = xmlnode.Count  -  1; i ++）
 {
 listx.Add（xmlnode [i] .Attributes [x]。Value）; 
} 

 for（int k = 0; k< listx.Count; k ++）
 {
 MessageBox.Show（listx [k]）; 
} 
} 
} 
} 

此解决方案将读取xml文件中的x值并将其存储在一个名为listx的列表。我将留给你为y和z做同样的事。

我已经测试过它的工作原理

  private   void  Form1_Load（ object  sender，EventArgs e）
 {
 XmlDocument doc =  new  XmlDocument（）; 
 doc.Load（ @  C：\ Users \admin \Desktop\prova2 \ file.xml跨度>）;  //  在此处插入文件路径 

 XmlNodeList nodes = doc.DocumentElement。 SelectNodes（  / Shapes / Point）; 

 List< string> x =  new  List< string>（）; 
 List< string> y =  new  List< string>（）; 
 List< string> z =  new  List< string>（）; 

 foreach （节点中的XmlNode节点）
 {
 x.Add（node.Attributes [  x]。Value）; 
 y.Add（node.Attributes [  y]。Value）; 
 z.Add（node.Attributes [  z]。Value）; 
} 
} 

记得申报

使用System.Xml; 

I am having an XML file which holds xml values.

I want to extract these values to a List<double> so that I can manipulate for further use.

How to efficiently extract these values and store them in List<double>

XML:

<Shapes>
  <Point x="13650" y="12000" z="-500" />
  <Point  x="13653.6115" y="11926.4871" z="-500" />
  <Point x="13664.411" y="11853.6823" z="-500" />
  <Point x="13682.2947" y="11782.2865" z="-500" />
  <Point  x="13707.0904" y="11712.9874" z="-500" />
  <Point x="13738.5591" y="11646.4524" z="-500" />
</Shapes>

List<double> x=new List<double>();
List<double> y=new List<double>();
List<double> z=new List<double>();

How to add these attribute values in the list

Check out the following example:

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Xml;
using System.IO;

namespace WindowsFormsApplicationCS
{
    public partial class Form8 : Form
    {
        public Form8()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            XmlDocument xmldoc = new XmlDocument();
            XmlNodeList xmlnode;
            int i = 0;
            List<string> listx = new List<string>();
      
            FileStream fs = new FileStream("XMLFILE1.xml", FileMode.Open, FileAccess.Read);
            xmldoc.Load(fs);
            xmlnode = xmldoc.GetElementsByTagName("Point");
            for (i = 0; i <= xmlnode.Count - 1; i++)
            {
                listx.Add(xmlnode[i].Attributes["x"].Value);
            }

            for (int k = 0; k < listx.Count; k++)
	        {
                MessageBox.Show(listx[k]);
	        }
        }
    }
}

This solution will read the x values from the xml file and store them in a list called listx. I shall leave it to you to do the same for y and z.

I have tested and it works

private void Form1_Load(object sender, EventArgs e)
       {
           XmlDocument doc = new XmlDocument();
           doc.Load(@"C:\Users\admin\Desktop\prova2\file.xml"); //insert the file path here

           XmlNodeList nodes = doc.DocumentElement.SelectNodes("/Shapes/Point");

           List<string> x = new List<string>();
           List<string> y = new List<string>();
           List<string> z = new List<string>();

           foreach (XmlNode node in nodes)
           {
               x.Add(node.Attributes["x"].Value);
               y.Add(node.Attributes["y"].Value);
               z.Add(node.Attributes["z"].Value);
           }
       }

remember to declare

using System.Xml;