如何使用 Visual C# 从 URL 读取 XML 数据

Question

There are 1304 KeyFamily groups.

As an example: Quarterly National Accounts in XML.

The task is to combine all these 1304 families in one txt file using id and Name

This is the way how it must look like in txt file: QNA|Quartily National Accounts PAT_IND|..... ....|....

 while (reader.Read())
        {
            switch (reader.NodeType)
            {
                case XmlNodeType.Element:
                    Console.Write(reader.Value);

                    while (reader.MoveToNextAttribute()) 
                        Console.Write(reader.Value + "'");
                    Console.Write(">");
                    Console.WriteLine(">");
                    break;
                case XmlNodeType.Text: 
                    Console.WriteLine(reader.Value);
                    break;
                case XmlNodeType.EndElement: 
                    Console.Write("</" + reader.Name);
                    Console.WriteLine(">");
                    break;
            }
        }

<KeyFamily id="QNA" agencyID="OECD">...</KeyFamily>
<KeyFamily id="PAT_IND" agencyID="OECD">...</KeyFamily>
<KeyFamily id="SNA_TABLE11" agencyID="OECD">...</KeyFamily>
<KeyFamily id="EO78_MAIN" agencyID="OECD">
<Name xml:lang="en">
Economic Outlook No 78 - December 2005 - Annual Projections for OECD Countries
</Name>

Answer 1

Try following which uses xml linq :

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


namespace ConsoleApplication108
{
    class Program
    {
        const string XML_FILENAME = @"c:\temp\test.xml";
        const string URL = "https://stats.oecd.org/restsdmx/sdmx.ashx/GetDataStructure/all";
        const string TEXT_FILENAME = @"c:\temp\test.txt";
        static void Main(string[] args)
        {
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.CheckCharacters = false;
            //XmlReader reader = XmlReader.Create(XML_FILENAME, settings);
            XmlReader reader = XmlReader.Create(URL, settings);
            StreamWriter writer = new StreamWriter(TEXT_FILENAME);
            while (!reader.EOF)
            {
                if (reader.Name != "KeyFamily")
                {
                    reader.ReadToFollowing("KeyFamily");
                }
                if (!reader.EOF)
                {
                    XElement keyFamily = (XElement)XElement.ReadFrom(reader);

                    List<string> columns = new List<string>();
                    columns.Add((string)keyFamily.Attribute("id"));
                    //string agencyID = (string)keyFamily.Attribute("agencyID");
                    columns.AddRange(keyFamily.Elements().Where(x => x.Name.LocalName == "Name").Select(x => (string)x));

                    writer.WriteLine(string.Join("|", columns));
                }
            }
            writer.Flush();
            writer.Close();

        }

    }


}