Чтение значения дочернего узла из большого xml в C#

Question

У меня 4000 строк xml-ответа от службы. Я извлек конкретный раздел из этого большого xml, используя требуемое имя тега

XmlNodeList xmlForms = xmlDo c .GetElementsByTagName ("Form");

Частичный пример этого узла xml выглядит как показано ниже

 <Form>
  <FormID>3434294</FormID>
  <StatusDate>0001-01-01T00:00:00</StatusDate>
  <InternalFormNo>CADFADSFSAGDSADG01</InternalFormNo>
  <ExternalFormNo>CADFASDFASFSC1001</ExternalFormNo>
  <ProposalDescription>Treatment</ProposalDescription>
  <ProposalForm>false</ProposalForm>
  <StateApprovals>
    <StateApproval>
      <StateApprovalID>2245363363636</StateApprovalID>
      <IssueLimitSet>
        <IssueLimitSetID>88</IssueLimitSetID>
        <Name>AccAdv</Name>
        <Note />
        <ModifyDate>0001-01-01T00:00:00</ModifyDate>
        <IssueLimits>
          <IssueLimit>
            <IssueLimtID>80</IssueLimtID>
            <GIAmount>62</GIAmount>
            <SIAmount>0.00</SIAmount>
            <ChangeProcessingCGIAmount>0</ChangeProcessingCGIAmount>
            <MaximumMultiSelect>0</MaximumMultiSelect>
            <CreateDate>0001-01-01T00:00:00</CreateDate>
            <ModifyDate>0001-01-01T00:00:00</ModifyDate>
          </IssueLimit>
        </IssueLimits>
      </IssueLimitSet>
      <SpecialProcessing>false</SpecialProcessing>
      <ModifyUser>TESTUSER</ModifyUser>
      <ModifyDate>2016-02-17T17:52:59.163</ModifyDate>
    </StateApproval>
  </StateApprovals>
</Form>

Мне нужно прочитать узел GIAmount и извлечь его значение (62). Но нотация xpath всегда дает мне нулевое значение. Как прочитать этот дочерний узел из этого под- xml. простой xpath также всегда дает значение null.

foreach (XmlNode form in xmlForms)
                        {
                            var statusDate= form.SelectSingleNode("/Form/StatusDate"); //This always null i am getting

}

---------------- Оригинал xml ------------ В разделе Варианты -> Формы-> Форма - Некоторые сценарии ios приходят несколько тегов формы, мне нужно прочитать этот конкретный узел в каждой форме -------

<?xml version="1.0" encoding="utf-8"?>
<Product xmlns="http://testtest.com/twmku">
  <ProductID>72</ProductID>
  <InternalDescription>AccidentAdvance</InternalDescription>
  <ExternalDescription>AccidentAdvance</ExternalDescription>
  <Variations>
    <Variation>
      <VariationID>231</VariationID>
      <InternalDescription>AccidentAdvance123</InternalDescription>
      <ExternalDescription>AccidentAdvance</ExternalDescription>
      <ProposalDescription />
      <IsProposalReady>false</IsProposalReady>      
      <StatusDate>2009-03-26T00:00:00</StatusDate>
      <EffectiveDate>2009-04-01T00:00:00</EffectiveDate>
      <WithdrawnDate>0001-01-01T00:00:00</WithdrawnDate>
      <ModifyUser>Utesruser</ModifyUser>
      <ModifyDate>2011-11-30T10:35:26.313</ModifyDate>
      <Employers />
      <Forms>
        <Form>
          <FormID>3493</FormID>        
          <IsGeneric>true</IsGeneric>
          <HasLimitsInUnits>true</HasLimitsInUnits>
          <Description>AccAdv Master Policy</Description>
          <CreateUser>US\testMW</CreateUser>
          <CreateDate>0001-01-01T00:00:00</CreateDate>
          <ModifyUser>US\testMW</ModifyUser>
          <ModifyDate>2011-12-12T11:42:40.06</ModifyDate>          
          <DataElements />
          <StateApprovals>
            <StateApproval>
              <StateApprovalID>2256556</StateApprovalID> 
              <IssueLimitSet>
                <IssueLimitSetID>88</IssueLimitSetID>
                <Name>AccAdv Modtest</Name>
                <Note />
                <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                <IssueLimits>
                  <IssueLimit>
                    <IssueLimtID>80</IssueLimtID>
                    <Keyword>AccAdv Mod 1</Keyword>
                    <MinMarketingLimit>0.50</MinMarketingLimit>
                    <MaxMarketingLimit>12.00</MaxMarketingLimit>
                    <CGIAmount>0.00</CGIAmount>
                    <GIAmount>6</GIAmount>
                    <SIAmount>0.00</SIAmount>
                    <ChangeProcessingCGIAmount>0</ChangeProcessingCGIAmount>                   
                    <CreateDate>0001-01-01T00:00:00</CreateDate>
                    <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                  </IssueLimit>
                </IssueLimits>
              </IssueLimitSet>
              <StateRequirementSet />
              <QuestionSet />
              <SICSet />
              <DateFiled>0001-01-01T00:00:00</DateFiled>          
              <SpecialProcessing>false</SpecialProcessing>
              <ModifyUser>JBtestD</ModifyUser>
              <ModifyDate>2016-02-18T14:39:50.927</ModifyDate>
            </StateApproval>
          </StateApprovals>
          <Parameters />
          <IsSelected>true</IsSelected>
        </Form>

        <Form>
          <FormID>3495</FormID>
          <IsGeneric>true</IsGeneric>
          <HasLimitsInUnits>true</HasLimitsInUnits>
          <Description>AccAdv Master main</Description>
          <CreateUser>US\testMqW</CreateUser>
          <CreateDate>0001-01-01T00:00:00</CreateDate>
          <ModifyUser>US\testMW</ModifyUser>
          <ModifyDate>2011-12-12T11:42:40.06</ModifyDate>
          <DataElements />
          <StateApprovals>
            <StateApproval>
              <StateApprovalID>26556</StateApprovalID>
              <IssueLimitSet>
                <IssueLimitSetID>88</IssueLimitSetID>
                <Name>AccAdv Moretest</Name>
                <Note />
                <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                <IssueLimits>
                  <IssueLimit>
                    <IssueLimtID>84</IssueLimtID>
                    <Keyword>AccAdv Mod 1</Keyword>
                    <MinMarketingLimit>0.50</MinMarketingLimit>
                    <MaxMarketingLimit>12.00</MaxMarketingLimit>
                    <CGIAmount>0.00</CGIAmount>
                    <GIAmount>34</GIAmount>
                    <SIAmount>0.00</SIAmount>
                    <ChangeProcessingCGIAmount>0</ChangeProcessingCGIAmount>
                    <CreateDate>0001-01-01T00:00:00</CreateDate>
                    <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                  </IssueLimit>
                </IssueLimits>
              </IssueLimitSet>
              <StateRequirementSet />
              <QuestionSet />
              <SICSet />
              <DateFiled>0001-01-01T00:00:00</DateFiled>
              <SpecialProcessing>false</SpecialProcessing>
              <ModifyUser>JBtestD</ModifyUser>
              <ModifyDate>2016-02-18T14:39:50.927</ModifyDate>
            </StateApproval>
          </StateApprovals>
          <Parameters />
          <IsSelected>true</IsSelected>
        </Form>
      </Forms>      
      <ParameterValueSets />
      <AllowCustomRates>false</AllowCustomRates>
    </Variation>
  </Variations>
</Product>

Answer 1

Вы уже нацеливаетесь на элемент Form, поэтому нет причин включать его в XPath. Просто пропустите этот тег и составьте путь с его потомками.

В вашем случае: "StateApprovals/StateApproval/IssueLimitSet/IssueLimits/GIAmount"

Или, что более компактно: "//GIAmount"

Обратите внимание, что мой ответ основан на фрагменте вашего сообщения, и путь может измениться в зависимости от фактического содержания.

Answer 2

Одного значения обычно недостаточно. Попробуйте xml linq, как показано ниже:

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

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            string xml = File.ReadAllText(FILENAME);
            XDocument doc = XDocument.Parse(xml);
            XNamespace ns = doc.Root.GetDefaultNamespace();

            List<StateApproval> approvals = doc.Descendants(ns + "StateApproval").Select(x => new StateApproval()
            {
                id = (string)x.Element(ns + "StateApprovalID"),
                limitSetId = (string)x.Descendants(ns + "IssueLimitSetID").FirstOrDefault(),
                name = (string)x.Descendants(ns + "Name").FirstOrDefault(),
                modifyDate = (DateTime)x.Descendants(ns + "ModifyDate").FirstOrDefault(),
                issueLimitId = (string)x.Descendants(ns + "IssueLimtID").FirstOrDefault(),
                giAmount = (decimal)x.Descendants(ns + "GIAmount").FirstOrDefault(),
                siAmount = (decimal)x.Descendants(ns + "SIAmount").FirstOrDefault(),
                changeAmount = (decimal)x.Descendants(ns + "ChangeProcessingCGIAmount").FirstOrDefault(),
                min = (decimal)x.Descendants(ns + "MinMarketingLimit").FirstOrDefault(),
                max = (decimal)x.Descendants(ns + "MaxMarketingLimit").FirstOrDefault(),
                createDate = (DateTime)x.Descendants(ns + "CreateDate").FirstOrDefault(),
            }).ToList();
        }
    }
    public class StateApproval
    {
        public string id { get; set; }
        public string limitSetId { get; set; }
        public string name { get; set; }
        public DateTime modifyDate { get; set; }
        public string issueLimitId { get; set; }
        public decimal giAmount { get; set; }
        public decimal siAmount { get; set; }
        public decimal changeAmount { get; set; }
        public decimal min { get; set; }
        public decimal max { get; set; }
        public DateTime createDate { get; set; }

    }
}

Answer 3

Лучше использовать LINQ to XML. Используя его методы, очень легко добраться до любого элемента XML.

(1) Ваш XML имеет пространство имен по умолчанию. Это нужно учитывать. (2) Для нескольких элементов <Form>...</Form> требуется al oop.

c#

void Main()
{
    XElement xelem = XElement.Parse(@"<Product xmlns='http://testtest.com/twmku'>
  <ProductID>72</ProductID>
  <InternalDescription>AccidentAdvance</InternalDescription>
  <ExternalDescription>AccidentAdvance</ExternalDescription>
  <Variations>
    <Variation>
      <VariationID>231</VariationID>
      <InternalDescription>AccidentAdvance123</InternalDescription>
      <ExternalDescription>AccidentAdvance</ExternalDescription>
      <ProposalDescription />
      <IsProposalReady>false</IsProposalReady>      
      <StatusDate>2009-03-26T00:00:00</StatusDate>
      <EffectiveDate>2009-04-01T00:00:00</EffectiveDate>
      <WithdrawnDate>0001-01-01T00:00:00</WithdrawnDate>
      <ModifyUser>Utesruser</ModifyUser>
      <ModifyDate>2011-11-30T10:35:26.313</ModifyDate>
      <Employers />
      <Forms>
        <Form>
          <FormID>3493</FormID>        
          <IsGeneric>true</IsGeneric>
          <HasLimitsInUnits>true</HasLimitsInUnits>
          <Description>AccAdv Master Policy</Description>
          <CreateUser>US\testMW</CreateUser>
          <CreateDate>0001-01-01T00:00:00</CreateDate>
          <ModifyUser>US\testMW</ModifyUser>
          <ModifyDate>2011-12-12T11:42:40.06</ModifyDate>          
          <DataElements />
          <StateApprovals>
            <StateApproval>
              <StateApprovalID>2256556</StateApprovalID> 
              <IssueLimitSet>
                <IssueLimitSetID>88</IssueLimitSetID>
                <Name>AccAdv Modtest</Name>
                <Note />
                <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                <IssueLimits>
                  <IssueLimit>
                    <IssueLimtID>80</IssueLimtID>
                    <Keyword>AccAdv Mod 1</Keyword>
                    <MinMarketingLimit>0.50</MinMarketingLimit>
                    <MaxMarketingLimit>12.00</MaxMarketingLimit>
                    <CGIAmount>0.00</CGIAmount>
                    <GIAmount>6</GIAmount>
                    <SIAmount>0.00</SIAmount>
                    <ChangeProcessingCGIAmount>0</ChangeProcessingCGIAmount>                   
                    <CreateDate>0001-01-01T00:00:00</CreateDate>
                    <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                  </IssueLimit>
                </IssueLimits>
              </IssueLimitSet>
              <StateRequirementSet />
              <QuestionSet />
              <SICSet />
              <DateFiled>0001-01-01T00:00:00</DateFiled>          
              <SpecialProcessing>false</SpecialProcessing>
              <ModifyUser>JBtestD</ModifyUser>
              <ModifyDate>2016-02-18T14:39:50.927</ModifyDate>
            </StateApproval>
          </StateApprovals>
          <Parameters />
          <IsSelected>true</IsSelected>
        </Form>
        <Form>
          <FormID>3495</FormID>
          <IsGeneric>true</IsGeneric>
          <HasLimitsInUnits>true</HasLimitsInUnits>
          <Description>AccAdv Master main</Description>
          <CreateUser>US\testMqW</CreateUser>
          <CreateDate>0001-01-01T00:00:00</CreateDate>
          <ModifyUser>US\testMW</ModifyUser>
          <ModifyDate>2011-12-12T11:42:40.06</ModifyDate>
          <DataElements />
          <StateApprovals>
            <StateApproval>
              <StateApprovalID>26556</StateApprovalID>
              <IssueLimitSet>
                <IssueLimitSetID>88</IssueLimitSetID>
                <Name>AccAdv Moretest</Name>
                <Note />
                <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                <IssueLimits>
                  <IssueLimit>
                    <IssueLimtID>84</IssueLimtID>
                    <Keyword>AccAdv Mod 1</Keyword>
                    <MinMarketingLimit>0.50</MinMarketingLimit>
                    <MaxMarketingLimit>12.00</MaxMarketingLimit>
                    <CGIAmount>0.00</CGIAmount>
                    <GIAmount>34</GIAmount>
                    <SIAmount>0.00</SIAmount>
                    <ChangeProcessingCGIAmount>0</ChangeProcessingCGIAmount>
                    <CreateDate>0001-01-01T00:00:00</CreateDate>
                    <ModifyDate>0001-01-01T00:00:00</ModifyDate>
                  </IssueLimit>
                </IssueLimits>
              </IssueLimitSet>
              <StateRequirementSet />
              <QuestionSet />
              <SICSet />
              <DateFiled>0001-01-01T00:00:00</DateFiled>
              <SpecialProcessing>false</SpecialProcessing>
              <ModifyUser>JBtestD</ModifyUser>
              <ModifyDate>2016-02-18T14:39:50.927</ModifyDate>
            </StateApproval>
          </StateApprovals>
          <Parameters />
          <IsSelected>true</IsSelected>
        </Form>
      </Forms>      
      <ParameterValueSets />
      <AllowCustomRates>false</AllowCustomRates>
    </Variation>
  </Variations>
</Product>");

    //string GIAmount = GIAmount.Descendants(ns + "GIAmount").FirstOrDefault().Value;
    XNamespace ns = xelem.GetDefaultNamespace();

    foreach (var el in xelem.Descendants(ns + "GIAmount"))
    {
        Console.WriteLine("GIAmount={0}", el.Value);    
    }
}

Выход

GIAmount=6
GIAmount=34