C#獲取特定元素下的所有元素值

我有一個包含 Location 元素的 XML 檔案，它的所有子元素都包含我需要放入串列中的資訊，或者理想情況下放入 Location 型別物件中。

在這里，我定義了我的位置類：

public class Location
    {
        /* <Summary>
         * Class that describes a location object in GPL. This class is 
         *  used to get/put location objects from TCS
         */
        #region Private Declarations
        private string _msg;
        private string _msgIn;
        private string[] _msgRes;
        private TcpIpComm _client { get; set; }
        #endregion

        public Location(TcpIpComm commObj, string locName)
        {
            _client = commObj;
            Name = locName;
        }

        public Location(TcpIpComm commObj)
        {
            _client = commObj;
        }

        public Location()
        {

        }

        public string Name { get; set; }
        public int Index { get; set; }
        public float Joint1 { get; set; }
        public float Joint2 { get; set; }
        public float Joint3 { get; set; }
        public float Joint4 { get; set; }
        public float Joint5 { get; set; }
        public float Joint6 { get; set; }
        public float Joint7 { get; set; }
        public float ZClearance = 0;
        public LocType Type { get; set; }

        /// <summary>
        /// 0 = cartesian,
        /// 1 = angles
        /// </summary>
        public enum LocType
        {
            Cartesian = 0,
            Angles = 1
        }
}

這是我的 XML 檔案的示例：

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfLocations xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Location>
    <Name>LocName0</Name>
    <Type>Angles</Type>
    <Index>0</Index>
    <ZClearance>0</ZClearance>
    <Joint1>0</Joint1>
    <Joint2>0</Joint2>
    <Joint3>0</Joint3>
    <Joint4>0</Joint4>
    <Joint5>0</Joint5>
    <joint6>0</joint6>
    <Joint6>0</Joint6>
  </Location>
  <Location>
    <Name>LocName1</Name>
    <Type>Angles</Type>
    <Index>0</Index>
    <ZClearance>0</ZClearance>
    <Joint1>1</Joint1>
    <Joint2>1</Joint2>
    <Joint3>1</Joint3>
    <Joint4>1</Joint4>
    <Joint5>1</Joint5>
    <joint6>1</joint6>
    <Joint6>1</Joint6>
  </Location>
  <Location>
    <Name>LocName2</Name>
    <Type>Angles</Type>
    <Index>0</Index>
    <ZClearance>0</ZClearance>
    <Joint1>2</Joint1>
    <Joint2>2</Joint2>
    <Joint3>2</Joint3>
    <Joint4>2</Joint4>
    <Joint5>2</Joint5>
    <joint6>2</joint6>
    <Joint6>2</Joint6>
  </Location>

現在我希望能夠在方法中輸入位置名稱（例如：LocName0），并將該名稱元素下的所有值在串列中回傳給我（型別、索引、ZClearance、Joint1、Joint2 等... ）。我正在努力解決這個問題，因為 Name 元素不是任何東西的父元素。它是 Location 的子元素，因此 Name 下面的 Elements 不是后代，AFAIK。

這是我寫的一種方法，試圖做我所描述的：

        public static void GetTeachPoint(string teachName, string filePath)
        {
            var listOfElems = XElement.Parse(filePath)
                .Elements() // gets all elements under root
                .Where(x => x.Name.LocalName.StartsWith(teachName))
                .SelectMany(x => x.Elements())
                .Select(x => x.Value)
                .ToList();
            foreach(string item in listOfElems){
                MessageBox.Show(item);
            }
        }

但是，當我將位置名稱和檔案路徑傳遞給方法時，我收到一個 System.Xml.XmlException: 'Data at the root level is invalid. Line 1, position 1.'

uj5u.com熱心網友回復：

這不會像您認為的那樣做：

XElement.Parse(filePath)

這試圖決議filePath 好像它實際上是 XML。我懷疑您打算使用XElement.Loadwhich 從檔案加載 XML - 或者您可能使用XDocument.Load.

這將克服最初的問題，但您的查詢仍然被破壞。你想要（我相信）類似的東西：

var elements = XElement.Load(filePath)
    .Elements("Location")
    .Elements("Name")
    .Where(x => x.Value == teachName)
    .SelectMany(x => x.Parent.Elements());

uj5u.com熱心網友回復：

嘗試以下：

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

namespace ConsoleApp2
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XmlReader reader = XmlReader.Create(FILENAME);
            XmlSerializer serializer = new XmlSerializer(typeof(ArrayOfLocations));
            ArrayOfLocations location = (ArrayOfLocations)serializer.Deserialize(reader);

            Dictionary<string, Location> dict = location.location
               .GroupBy(x => x.Name)
               .ToDictionary(x => x.Key, y => y.FirstOrDefault());
        }
    }
    public class ArrayOfLocations
    {
        [XmlElement("Location")]
        public List<Location> location { get; set; }
    }
    public class Location
    {

        private string _msg;
        private string _msgIn;
        private string[] _msgRes;

        public Location()
        {

        }

        public string Name { get; set; }
        public int Index { get; set; }
        public float Joint1 { get; set; }
        public float Joint2 { get; set; }
        public float Joint3 { get; set; }
        public float Joint4 { get; set; }
        public float Joint5 { get; set; }
        public float Joint6 { get; set; }
        public float Joint7 { get; set; }
        public float ZClearance = 0;
        public LocType Type { get; set; }

        /// <summary>
        /// 0 = cartesian,
        /// 1 = angles
        /// </summary>
        public enum LocType
        {
            Cartesian = 0,
            Angles = 1
        }
    }
}

標籤：C＃xml林克

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