我的 Foreach 循环遍历主节点下的子节点列表，并且只选择第一个节点答案

【问题标题】：My Foreach Loop loops through a list of ChildNodes under a Main Node, and only selects the firstNode我的 Foreach 循环遍历主节点下的子节点列表，并且只选择第一个节点
【发布时间】：2018-10-27 14:52:33
【问题描述】：

我正在尝试遍历主节点下的 ChildNode 列表，并且我在 XMLNodeList 中有 ChildNode 列表。我已经成功地循环了它，那部分代码可以工作，但它只会选择 NodeList 的第一个节点，因为我正在使用 SelectSingleNode。我需要解决这个问题，循环遍历 NodeList 中的每个 XML 节点并从中选择一些子属性。我在浏览每个节点时尝试删除它，但没有成功，我稍微研究了 SelectNodes，但它们都具有相同的名称；唯一真正的区别是日期。有什么建议吗？

代码：

XmlNode TransactionMain = XMLFromServer.SelectSingleNode("");
XmlNodeList TransactionsNodeList = TransactionMain.ChildNodes;
foreach(XmlNode TransactionsSingleNode in TransactionsNodeList) {
    //Finding all of the pertinent information for the Transactions table from EACH node (note the foreach loop) inside the bigger Transaction node
    string SalesTaxAmount = TransactionsSingleNode.SelectNodes("").Value;
    string PaymentAmount = TransactionsSingleNode.SelectSingleNode("").Value;
    string RecurringProfileID = TransactionsSingleNode.SelectSingleNode("").Value;
    string TransactedDateTime = TransactionsSingleNode.SelectSingleNode("").Value;
    string NumberOfDays = TransactionsSingleNode.SelectSingleNode("").Value;
    string LicenseSizeDescriptionTransactionsList = TransactionsSingleNode.SelectSingleNode("").Value;
    Transactions.Rows.Add(CompanyName, SalesTaxAmount, PaymentAmount, RecurringProfileID, TransactedDateTime, NumberOfDays, LicenseSizeDescriptionTransactionsList);

CompanyName 变量来自另一个地方，它工作正常。 e 我删除了 XPath 表达式，因为它包含一些私人信息。如果有必要，我可以把它们放回去。 XML：

<Authorization LicenseDaysLeft="22" LicenseEndDate="2018-11-17" LicenseSizeDescription="" LicenseSizeCode="1">
  <Paypal LastEmailUsed="" RecurringProfileID="" LastTransactionDateTime="">
     <Transactions>
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-10-18 07:54" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-09-18 08:19" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-08-19 00:38" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-07-20 09:16" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-06-20 01:24" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-05-21 09:06" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-04-19 08:31" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-03-13 08:58" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-02-11 08:22" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2018-01-17 10:22" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-12-13 10:08" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-11-13 12:04" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-10-14 10:18" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-09-20 07:14" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-08-22 23:52" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-07-21 08:36" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-06-24 08:58" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-05-24 11:24" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-04-17 16:42" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-03-18 09:02" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-02-16 15:08" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2017-01-23 09:13" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2016-12-24 18:07" NumberOfDays="30" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2016-11-23 16:09" NumberOfDays="0" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2016-10-24 14:37" NumberOfDays="0" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2016-09-24 15:58" NumberOfDays="0" LicenseSize="0" LicenseSizeDescription="" />
        <Transaction SalesTaxAmount="0.00" PaymentAmount="0.00" RecurringProfileID="" TransactedDateTimeUTC="0001-01-01 00:00" TransactedDateTime="2016-08-25 16:48" NumberOfDays="0" LicenseSize="0" LicenseSizeDescription="" />
     </Transactions>
  </Paypal>
 </Authorization>

尝试遍历每个事务并将其添加到表中。它只会选择第一个。

【问题讨论】：

使用较新的库 XML Linq 通常会得到更好的结果。您没有发布 xml，所以我真的无能为力。

标签： c# xml foreach selectsinglenode selectnodes

【解决方案1】：

xml linq 非常简单：

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

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("SalesTaxAmount", typeof(decimal));
            dt.Columns.Add("PaymentAmount", typeof(decimal)); 
            dt.Columns.Add("RecurringProfileID", typeof(string)); 
            dt.Columns.Add("TransactedDateTimeUTC", typeof(DateTime)); 
            dt.Columns.Add("TransactedDateTime", typeof(DateTime)); 
            dt.Columns.Add("NumberOfDays", typeof(int)); 
            dt.Columns.Add("LicenseSize", typeof(int));
            dt.Columns.Add("LicenseSizeDescription=", typeof(string));

            XDocument doc = XDocument.Load(FILENAME);
            foreach(XElement transaction in doc.Descendants("Transaction"))
            {
                dt.Rows.Add(new object[] {
                    (decimal?)transaction.Attribute("SalesTaxAmount"),
                    (decimal?)transaction.Attribute("PaymentAmount"),
                    (string)transaction.Attribute("RecurringProfileID"),
                    (DateTime)transaction.Attribute("TransactedDateTimeUTC"),
                    (DateTime)transaction.Attribute("TransactedDateTime"),
                    (int?)transaction.Attribute("NumberOfDays"),
                    (int)transaction.Attribute("LicenseSize"),
                    (string)transaction.Attribute("LicenseSizeDescription")
                });

            }

        }
    }
}

【讨论】：

我非常感谢您的帮助，由于我一直忙于学校，因此迟到了回复。修改代码需要一点时间，但它奏效了；我只需要在代码末尾运行一个函数，将所有空值更改为 Web 浏览器的可解析字符串。
你指的是整数和小数的空值吗？你想让它们为零吗？或者，也许将值作为字符串而不是数字。
我设法让它工作。必须在 Linq、XElement 中执行一半的循环，而在 c# 中执行另一半。