C# 读取格式不正确的 XML 文件

Question

我必须读取一个没有根元素的 XML 文件来提取包含的数据。 XML 具有许多如下元素:

<DocumentElement>
  <LOG_x0020_ParityRate>
    <DATE>12/09/2017 - 00:00</DATE>
    <CHANNELNAME>ParityRate</CHANNELNAME>
    <SQL>update THROOMDISP set ID_HOTEL = '104', ID_ROOM = '920', NUM = '3', MYDATA = '20171006' where id_hotel =104 and id_room ='920' and MYDATA ='20171006'</SQL>
    <ID_HOTEL>104</ID_HOTEL>
    <TYPEREQUEST>updateTHROOMDISP(OK)</TYPEREQUEST>
  </LOG_x0020_ParityRate>
</DocumentElement><DocumentElement>
  <LOG_x0020_ParityRate>
    <DATE>12/09/2017 - 00:00</DATE>
    <CHANNELNAME>ParityRate</CHANNELNAME>
    <SQL>update THROOMDISP set ID_HOTEL = '105', ID_ROOM = '923', NUM = '1', MYDATA = '20171006' where id_hotel =105 and id_room ='923' and MYDATA ='20171006'</SQL>
    <ID_HOTEL>105</ID_HOTEL>
    <TYPEREQUEST>updateTHROOMDISP(OK)</TYPEREQUEST>
  </LOG_x0020_ParityRate>
</DocumentElement><DocumentElement>
  <LOG_x0020_ParityRate>
    <DATE>12/09/2017 - 00:00</DATE>
    <CHANNELNAME>ParityRate</CHANNELNAME>
    <SQL>update THROOMDISP set ID_HOTEL = '104', ID_ROOM = '920', NUM = '3', MYDATA = '20171007' where id_hotel =104 and id_room ='920' and MYDATA ='20171007'</SQL>
    <ID_HOTEL>104</ID_HOTEL>
    <TYPEREQUEST>updateTHROOMDISP(OK)</TYPEREQUEST>
  </LOG_x0020_ParityRate>
</DocumentElement><DocumentElement>

我尝试将其作为字符串读取，手动添加打开和关闭标签，然后像 XDocument 一样解析它，但它也有一些格式错误的标签，例如这些

</DocumentElement>
<TYPEREQUEST>updateTHROOMPRICE(OK)</TYPEREQUEST>

这些标记与任何开始标记都不匹配，并且当我对结果字符串调用 XDocument.Parse 时，出现异常。该文件有数百万行，因此我无法逐行读取它，否则迭代将持续数小时。我怎样才能摆脱所有这些格式错误的标签并解析文档？

Answer 1

您的 xml 格式根本不正确，这在 xml 数据合并在一起时经常发生。您的 xml 在根级别有多个标签，因此请使用 XML 阅读器，如下所示:

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


namespace ConsoleApplication4
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.ConformanceLevel = ConformanceLevel.Fragment;
            XmlReader reader = XmlReader.Create(FILENAME,settings);
            while (!reader.EOF)
            {
                try
                {
                    if (reader.Name != "LOG_x0020_ParityRate")
                    {
                        reader.ReadToFollowing("LOG_x0020_ParityRate");
                    }
                    if (!reader.EOF)
                    {
                        XElement parityRate = (XElement)XElement.ReadFrom(reader);

                        ParityRate newLog = new ParityRate();
                        ParityRate.logs.Add(newLog);
                        newLog.date = DateTime.ParseExact((string)parityRate.Element("DATE"), "MM/dd/yyyy - hh:mm", System.Globalization.CultureInfo.InvariantCulture);
                        newLog.name = (string)parityRate.Element("CHANNELNAME");
                        newLog.sql = (string)parityRate.Element("SQL");
                        newLog.hotel = (int)parityRate.Element("ID_HOTEL");
                    }
                }
                catch (Exception ex)
                {
                }
            }
        }
    }
    public class ParityRate
    {
        public static List<ParityRate> logs = new List<ParityRate>();

        public DateTime date { get; set; }
        public string name { get; set; }
        public string sql { get; set; }
        public int hotel { get; set; }
    }
}