Extracting a Value From an XML File in C#

Question

Can someone help me out with extracting the "Value Y" of 4.247 in this XML file. I've searched through previous threads but can't seem to apply them to this structure.

<Chart1>
    <Chart1_SeriesGroup_Collection>
        <Chart1_SeriesGroup Label="MP_Trend_Data\MP_Prog/MP_DAILY_FLOW">
            <Chart1_CategoryGroup_Collection>
                <Chart1_CategoryGroup Label="12/24/2017 1:58:19 AM">
                   <Value X="0001-01-01T10:30:00+10:30"/>
               </Chart1_CategoryGroup>
               <Chart1_CategoryGroup Label="12/24/2017 1:58:19 AM">
                   <Value X="0001-01-01T10:30:00+10:30"/>
               </Chart1_CategoryGroup>
               <Chart1_CategoryGroup Label="12/24/2017 1:59:19 AM">
                   <Value X="0001-01-01T10:30:00+10:30"/>
               </Chart1_CategoryGroup>
               <Chart1_CategoryGroup Label="12/24/2017 1:59:19 AM">
                   <Value X="0001-01-01T10:30:00+10:30"/>
               </Chart1_CategoryGroup>
               <Chart1_CategoryGroup Label="12/24/2017 1:58:19 AM">
                   <Value Y="4.24700021743774" X="2017-12-24T12:28:19.333+10:30"/>
               </Chart1_CategoryGroup>

code I've tried:

var xDoc = XDocument.Load("C:\\attachment\\Flow.xml");

        XmlDocument xml = new XmlDocument();
        xml.LoadXml(xDoc.ToString());

        XmlNodeList xnList = xml.SelectNodes("/Chart1/Chart1_SeriesGroup_Collection/Chart1_SeriesGroup[@Label='MP_Trend_Data\\MP_Prog/MP_DAILY_FLOW']");

        foreach (XmlNode Node in xnList)
        {
            XmlNodeList ynList = Node.SelectNodes("/Chart1_CategoryGroup_Collection/Chart1_CategoryGroup/Value");
            foreach (XmlNode Node2 in ynList)
            {
                textBox1.Text = Node2.Attributes["Y"].Value.ToString();
            }
        }

Answer 1

var xmlStr = @"
    <Chart1>
        <Chart1_SeriesGroup_Collection>
            <Chart1_SeriesGroup Label='MP_Trend_Data\MP_Prog/MP_DAILY_FLOW'>
                <Chart1_CategoryGroup_Collection>
                    <Chart1_CategoryGroup Label='12/24/2017 1:58:19 AM'>
                        <Value X='0001-01-01T10:30:00+10:30'/>
                    </Chart1_CategoryGroup>
                    <Chart1_CategoryGroup Label='12/24/2017 1:58:19 AM'>
                        <Value X='0001-01-01T10:30:00+10:30'/>
                    </Chart1_CategoryGroup>
                    <Chart1_CategoryGroup Label='12/24/2017 1:59:19 AM'>
                        <Value X='0001-01-01T10:30:00+10:30'/>
                    </Chart1_CategoryGroup>
                    <Chart1_CategoryGroup Label='12/24/2017 1:59:19 AM'>
                        <Value X='0001-01-01T10:30:00+10:30'/>
                    </Chart1_CategoryGroup>
                    <Chart1_CategoryGroup Label='12/24/2017 1:58:19 AM'>
                        <Value Y='4.24700021743774' X='2017-12-24T12:28:19.333+10:30'/>
                    </Chart1_CategoryGroup>
                </Chart1_CategoryGroup_Collection>>
           </Chart1_SeriesGroup>
        </Chart1_SeriesGroup_Collection>
    </Chart1>";

var xml = XElement.Parse(xmlStr);
var firstY = xml.Descendants("Value").FirstOrDefault(v => v.Attribute("Y") != null);
if (firstY != null)
{
    var y = firstY.Attribute("Y").Value;
}

Answer 2

Try xml linq :

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

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);

            var results = doc.Descendants("Chart1_CategoryGroup").Where(x => x.Element("Value").Attribute("Y") != null).Select(x => new {
                label = (DateTime)x.Attribute("Label"),
                y = (double)x.Element("Value").Attribute("Y"),
                x = (DateTime)x.Element("Value").Attribute("X")
            }).ToList();
        }
    }
}