c#中根據子節點數據過濾XML集合

Question

我有以下學生的 XML 集合，如下所示。

<stdXmlFormat version="1.0">
  <students>
    <field id="ClassId">CB0012</field>
    <field id="ClassName">CBSE-12</field>
    <student id="123">
      <field id="SFirstNm">Ram</field>
      <field id="SLastNm">Raju</field>
      <field id="RollNumber">001</field>
    </student>
    <student id="124">
      <field id="SFirstNm">Sita</field>
      <field id="SLastNm">M</field>
      <field id="RollNumber">002</field>
    </student>
    <collection id="StudentCollection">
      <record>
        <field id="StudentId">5094e0ef-c966-484d-9892-e62bd828e7cf</field>
        <field id="FirstName">Ram</field>
        <field id="LastName">Raju</field>
      </record>
      <record>
        <field id="StudentId">70a0350a-9556-46f6-b089-bebcc278b1c1</field>
        <field id="FirstName">Sita</field>
        <field id="LastName">M</field>
      </record>
    </collection>
    <collection id="AccountTransactions">
      <record>
        <field id="Id">62f4181a-5510-4522-a24a-7d3005f2a907</field>
        <field id="TransactionType">Fees</field>
        <field id="Balance">5000.00</field>
      </record>
      <record>
        <field id="Id">0958d991-c777-46b3-954c-3682ff735bfc</field>
        <field id="TransactionType">Fine</field>
        <field id="Balance">2000.00</field>
      </record>
      <record>
        <field id="Id">3aadb37d-d066-491f-8525-2e299ad8d88b</field>
        <field id="TransactionType">Fees</field>
        <field id="Balance">6000.00</field>
      </record>
    </collection>
    <collection id="StudentAccountTransactions">
      <record>
        <field id="Id">5e7d0c97-8759-4beb-a688-009e23f10590</field>
        <field id="StudentId">5094e0ef-c966-484d-9892-e62bd828e7cf</field>
        <field id="AccountTransactionsId">62f4181a-5510-4522-a24a-7d3005f2a907</field>
      </record>
      <record>
        <field id="Id">b22bf993-4dc2-49e6-879f-504ca4ec8424</field>
        <field id="StudentId">5094e0ef-c966-484d-9892-e62bd828e7cf</field>
        <field id="AccountTransactionsId">0958d991-c777-46b3-954c-3682ff735bfc</field>
      </record>
      <record>
        <field id="Id">44641d91-38bf-4e24-895c-20f92f390acf</field>
        <field id="StudentId">70a0350a-9556-46f6-b089-bebcc278b1c1</field>
        <field id="AccountTransactionsId">3aadb37d-d066-491f-8525-2e299ad8d88b</field>
      </record>
    </collection>
  </students>
</stdXmlFormat>

學生節點是父節點，它由子節點和集合（ StudentCollection 、 AccountTransactions和StudentAccountTransactions ）組成。

<stdXmlFormat version="1.0">
  <students>
    <student></student>
    <collection id="StudentCollection"/>
    <collection id="AccountTransactions"/>   
    <collection id="StudentAccountTransactions"/>    
  </students>
</stdXmlFormat>

學生節點包含所有學生詳細信息，例如名字、姓氏、卷號等（這是一個包含更多信息的舊集合。為了更好地閱讀和理解，我刪除了一些屬性）

新集合StudentCollection中提供了相同的信息，但數據較少。此集合具有StudentId （用於識別其他集合中的學生的唯一 guid）。 與學生和StudentCollection的唯一關系是學生的名字和姓氏。

AccountTransactions是包含 id（用於識別每筆交易的唯一指南）和其他交易詳細信息的集合。 此集合中的 id 用作StudentAccountTransactions集合中的 AccountTransactionsId。

最終的集合StudentAccountTransactions包含 studentid（來自 StudentCollection）和 AccountTransactionsId（來自 AccountTransactions 集合）。

所以從這個列表中我需要獲取學生的詳細信息並將其傳遞給 DB TEAM 以保存到數據庫。他們准備好了表結構，如下所示

基本上我需要從這個集合中獲取 SFirstNm、SLastNm、RollNumber（來自學生）、StudentId、AccountTransactionsId 和 StudentAccountTransactionsId。

我嘗試使用 XMLdocument 和 Xdocument 獲取數據，但沒有任何效果

string xpath = @"/stdXmlFormat/students/students/field";
XmlNodeList nodeListstudent = root.SelectNodes(xpath);
foreach (XmlNode item in nodeListstudent )
            {
                string SID = item.Attributes["id"].Value;
                string sFirstNm, sLastNm = string.Empty;
                foreach (XmlNode childNodes in item .ChildNodes)
                {                       
                    string NodeName = childNodes.Attributes["id"].Value;
                    string NodeValue = childNodes.InnerText;

                    if (NodeName == "sFirstNm")
                    {
                        sFirstNm= NodeValue;
                    }
                    if (NodeName == "aBLastNm")
                    {
                        sLastNm = NodeValue;
                    }                        
                }
                
            }

由此我能夠獲得學生的名字和姓氏等，但是我如何使用名字和姓氏從StudentCollection獲取學生 ID？ 我真的被困在這里請幫忙。 使用該 studentid，我需要獲取其他詳細信息，例如 AccountTransactionsId 和 StudentAccountTransactionsId。

我嘗試使用以下方式過濾學生身份集合以進行測試，但沒有奏效。

XmlNodeList nodes = jsonXmlDocument.SelectNodes("//stdXmlFormat/students/collection/record/field[@id='5094e0ef-c966-484d-9892-e62bd828e7cf']");

請幫我 ！

Answer 1

這是一個開始：

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


namespace ConsoleApp2
{
    class Program
    {

        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("StudentId", typeof(string));
            dt.Columns.Add("SFirstNm", typeof(string));
            dt.Columns.Add("SLastNm", typeof(string));
            dt.Columns.Add("RollNumber", typeof(string));
            dt.Columns.Add("AccountTransaction", typeof(string));
            dt.Columns.Add("StudentAccountTransaction", typeof(string));

            XDocument doc = XDocument.Load(FILENAME);
            XElement xStudents = doc.Descendants("students").FirstOrDefault();
            var students = xStudents.Elements("student")
                .Select(x => new
                {
                    id = (string)x.Attribute("id"),
                    sFName = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "SFirstNm").FirstOrDefault(),
                    sLName = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "SLastNm").FirstOrDefault(),
                    rollNumber = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "RollNumber").FirstOrDefault(),
                }).ToList();

            XElement xStudentCollection = doc.Descendants("collection").Where(x => (string)x.Attribute("id") == "StudentCollection").FirstOrDefault();

            var studentCollection = xStudentCollection.Elements("record")
                .Select(x => new
                {
                    sId = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "StudentId").FirstOrDefault(),
                    sFName = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "FirstName").FirstOrDefault(),
                    sLName = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "LastName").FirstOrDefault(),
                }).ToList();

            XElement xAccountTransactions = doc.Descendants("collection").Where(x => (string)x.Attribute("id") == "AccountTransactions").FirstOrDefault();

            var accountTransactions = xAccountTransactions.Elements("record")
                .Select(x => new
                {
                    tId = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "Id").FirstOrDefault(),
                    type = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "TransactionType").FirstOrDefault(),
                    balanse = (decimal)x.Elements("field").Where(y => (string)y.Attribute("id") == "Balance").FirstOrDefault(),
                }).ToList();

            XElement xStudentAccountTransactions = doc.Descendants("collection").Where(x => (string)x.Attribute("id") == "StudentAccountTransactions").FirstOrDefault();

            var studentAccountTransactions = xStudentAccountTransactions.Elements("record")
                .Select(x => new
                {
                    satId = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "Id").FirstOrDefault(),
                    sId = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "StudentId").FirstOrDefault(),
                    tId = (string)x.Elements("field").Where(y => (string)y.Attribute("id") == "AccountTransactionsId").FirstOrDefault(),
                }).ToList();

            var studentRoll = students.Select(s => studentCollection.Where(sc => (s.sFName == sc.sFName) && (s.sLName == sc.sLName))
                .Select(x => new { fName = s.sFName, lName = s.sLName, roll = s.rollNumber, sId = x.sId }).FirstOrDefault()).ToList();

            var tranactions = accountTransactions.Select(at => studentAccountTransactions.Where(act => at.tId == act.tId)
                .Select(x => new { tId = x.tId, type = at.type, balance = at.balanse, satId = x.satId }).FirstOrDefault()).ToList();

            var results = (from sat in studentAccountTransactions
                           join tr in tranactions on sat.tId equals tr.tId
                           join  sr in studentRoll on sat.sId equals sr.sId
                           select new { sr = sr, tr = tr, sat = sat })
                           .ToList();
            foreach(var r in results)
            {
                dt.Rows.Add(new object[]
                {
                    r.sr.sId,
                    r.sr.fName,
                    r.sr.lName,
                    r.sr.roll,
                    r.tr.tId,
                    r.sat.satId
                });
            }    
           
        }

    }
 
 
}