计算我在特定节点中有多少元素

Question

晚上好， 我有一个这样的 XML 模板：

<Pedestrian Name='Kid'>
        <Initial_Position In_X='2' In_Y='2' />
        <Final_Position Fin_X='3' Fin_Y='3' Time='10' />
        <Final_Position Fin_X='4' Fin_Y='4' Time='12' />
    </Pedestrian>
    <Pedestrian Name='Mother'>
        <Initial_Position In_X='3' In_Y='3' />
        <Final_Position Fin_X='3' Fin_Y='3' Time='10' />
    </Pedestrian>

其中“Final_Position”出现在随机数的时间。

我对代码的想法如下：

foreach (XElement pedestrian in doc.Root.Elements("Pedestrian"))
            {
                XElement initialPosition = pedestrian.Element("Initial_Position");
                name = (string)pedestrian.Attribute("Name");
                X1 = (int)initialPosition.Attribute("In_X");
                Y1 = (int)initialPosition.Attribute("In_Y");
                MessageBox.Show(name);
                int i = 0;
               int x = doc.Root.Elements("Pedestrian").Elements("Final_Position").Count();// nodeList.Count();

                MessageBox.Show("x = " +x.ToString());
                int[] X_fin = new int[x];
                int[] Y_fin = new int[x];
                int[] Time_fin = new int[x];

                foreach (XElement finpos in doc.Root.Elements("Pedestrian").Elements("Final_Position"))
                {
                    X_fin[i] = (int)finpos.Attribute("Fin_X");
                    Y_fin[i] = (int)finpos.Attribute("Fin_Y");
                    Time_fin[i] = (int)finpos.Attribute("Time");

                    i++;
                }

            }

为了能够在最后创建一个对象数组Pedestrian，其中包含名称、Initial_Position(X1,Y1) 和 Final_Position(X_Fin,Y_Fin,Time_Fin)。

问题是，如果我放一些 MessageBox.Show() 以了解程序是如何工作的，那么输出是这样的：

Kid
2 2 
3 3 10 //
4 4 12 //
3 3 10 //final position of Kid + Mother
Mother
3 3
3 3 10 //
4 4 12 //
3 3 10 //

此外，数组 X_Fin 的大小为 3（我的文件中所有 Final_Position 的总和）。

我怎样才能更正它以便在 X_Fin 中拥有给定行人的所有位置？我的想法是在第二个 foreach

之后创建对象

Answer 1

试试这个

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

namespace ConsoleApplication97
{
    class Program
    {
        static void Main(string[] args)
        {
            string xml = 
                "<Root>" +
                "<Pedestrian Name='Kid'>" +
                    "<Initial_Position In_X='2' In_Y='2' />" +
                    "<Final_Position Fin_X='3' Fin_Y='3' Time='10' />" +
                    "<Final_Position Fin_X='4' Fin_Y='4' Time='12' />" +
                "</Pedestrian>" +
                "<Pedestrian Name='Mother'>" +
                    "<Initial_Position In_X='3' In_Y='3' />" +
                    "<Final_Position Fin_X='3' Fin_Y='3' Time='10' />" +
                "</Pedestrian>" +
                "</Root>";

            XElement root = XElement.Parse(xml);

            var results = root.Descendants("Pedestrian").Select(x => new
            {
                name = (string)x.Attribute("Name"),
                initialPosition = x.Elements("Initial_Position")
                   .Select(y => new { x = (int)y.Attribute("In_X"), y = (int)y.Attribute("In_Y") }).FirstOrDefault(),
                finalPosition = x.Elements("Final_Position")
                   .Select(y => new { x = (int)y.Attribute("Fin_X"), y = (int)y.Attribute("Fin_Y"), Time = (int)y.Attribute("Time")}).ToList()
            }).ToList();
        }
    }
}

Answer 2

让我们创建一个 Pedestrians 数组，其中包含 InitialPosition.X 和 .Y 以及一个 FinalPositions 数组，其中每个数组都有 X、Y 和 Time。

XElement root = XElement.Load(file); // or use your doc.Root instead
var peds = root.Elements("Pedestrian")
    .Select(p => new
    {
        Name = (string)p.Attribute("Name"),
        InitialPosition = new
        {
            X = (int)p.Element("Initial_Position").Attribute("In_X"),
            Y = (int)p.Element("Initial_Position").Attribute("In_Y")
        },
        FinalPositions = p.Elements("Final_Position")
                .Select(f => new
                {
                    X = (int)f.Attribute("Fin_X"),
                    Y = (int)f.Attribute("Fin_Y"),
                    Time = (int)f.Attribute("Time")
                }).ToArray()
    }).ToArray();

现在让我们输出行人数组和内部 FinalPositions。

int totalFinals = 0;
foreach (var pedestrian in peds)
{
    Console.WriteLine(string.Format("{0} has {1} final positions.", pedestrian.Name, pedestrian.FinalPositions.Length));
    Console.WriteLine(string.Format("{0} {1}", pedestrian.InitialPosition.X, pedestrian.InitialPosition.Y));
    foreach (var final in pedestrian.FinalPositions)
        Console.WriteLine(string.Format("{0} {1} {2}", final.X, final.Y, final.Time));
    totalFinals += pedestrian.FinalPositions.Length;
}
Console.WriteLine(string.Format("Total final positions = {0}", totalFinals));

输出和我想的一样

Kid has 2 final positions.
2 2
3 3 10
4 4 12
Mother has 1 final positions.
3 3
3 3 10
Total final positions = 3