将CSV文件转换为XML

时间:2010-06-18 12:45:36

标签: c# xml csv

我需要将CSV转换为XML文档。我到目前为止看到的示例都显示了如何使用CSV中的固定数量的列进行此操作。

到目前为止,我使用LINQ:

String[] File = File.ReadAllLines(@"C:\text.csv");

        String xml = "";

        XElement top = new XElement("TopElement",

        from items in File

        let fields = items.Split(';')

        select new XElement("Item",

        new XElement("Column1", fields[0]),

        new XElement("Column2", fields[1]),

        new XElement("Column3", fields[2]),

        new XElement("Column4", fields[3]),

        new XElement("Column5", fields[4])

        )

        );

        File.WriteAllText(@"C:\xmlout.xml", xml + top.ToString());

这是针对固定数量的列,但我的.CSV在每一行上都有不同的列数。

根据.CSV每行中有多少单词(列),你会如何适应某种循环?

日Thnx

5 个答案:

答案 0 :(得分:27)

var lines = File.ReadAllLines(@"C:\text.csv");

var xml = new XElement("TopElement",
   lines.Select(line => new XElement("Item",
      line.Split(';')
          .Select((column, index) => new XElement("Column" + index, column)))));

xml.Save(@"C:\xmlout.xml");

输入:

A;B;C
D;E;F
G;H

输出:

<TopElement>
  <Item>
    <Column0>A</Column0>
    <Column1>B</Column1>
    <Column2>C</Column2>
  </Item>
  <Item>
    <Column0>D</Column0>
    <Column1>E</Column1>
    <Column2>F</Column2>
  </Item>
  <Item>
    <Column0>G</Column0>
    <Column1>H</Column1>
  </Item>
</TopElement>

答案 1 :(得分:9)

如果您想使用标题作为元素名称:

var lines = File.ReadAllLines(@"C:\text.csv");
string[] headers = lines[0].Split(',').Select(x => x.Trim('\"')).ToArray();

var xml = new XElement("TopElement",
   lines.Where((line, index) => index > 0).Select(line => new XElement("Item",
      line.Split(',').Select((column, index) => new XElement(headers[index], column)))));

xml.Save(@"C:\xmlout.xml");

答案 2 :(得分:3)

我写了一个源自Vlax代码片段的课程。 另外,我提供了一个单元测试来记录工作流程。

单元测试:

[TestMethod]
public void convert_csv_to_xml()
{
    // Setup
    var csvPath = @"Testware\vendor.csv";
    var xmlPath = @"Testware\vendor.xml";

    // Test
    var success = DocumentConverter.Instance.CsvToXml(csvPath, xmlPath);

    // Verify
    var expected = File.Exists(xmlPath) && success;
    Assert.AreEqual(true, expected);
}

CSV到XML:

public class DocumentConverter
{
    #region Singleton
    static DocumentConverter _documentConverter = null;

    private DocumentConverter() { }

    public static DocumentConverter Instance
    {
        get
        {
            if (_documentConverter == null)
            {
                _documentConverter = new DocumentConverter();
            }

            return _documentConverter;
        }
    }
    #endregion

    public bool CsvToXml(string sourcePath, string destinationPath)
    {
        var success = false;

        var fileExists = File.Exists(sourcePath);

        if (!fileExists)
        {
            return success;
        }

        var formatedLines = LoadCsv(sourcePath);
        var headers = formatedLines[0].Split(',').Select(x => x.Trim('\"').Replace(" ", string.Empty)).ToArray();

        var xml = new XElement("VendorParts",
           formatedLines.Where((line, index) => index > 0).
               Select(line => new XElement("Part",
                  line.Split(',').Select((field, index) => new XElement(headers[index], field)))));

        try
        {
            xml.Save(destinationPath);

            success = true;
        }
        catch (Exception ex)
        {
            success = false;

            var baseException = ex.GetBaseException();
            Debug.Write(baseException.Message);
        }

        return success;
    }

    private List<string> LoadCsv(string sourcePath)
    {
        var lines = File.ReadAllLines(sourcePath).ToList();

        var formatedLines = new List<string>();

        foreach (var line in lines)
        {
            var formatedLine = line.TrimEnd(',');
            formatedLines.Add(formatedLine);
        }
        return formatedLines;
    }
}

注意:

我通过删除导致运行时异常的每个CSV行条目的尾随逗号来扩展Vlax的解决方案,因为索引超出了与列标题相关的范围。

答案 3 :(得分:0)

Cinchoo ETL-一个开放源代码库,可使用几行代码轻松地将CSV转换为Xml

对于示例CSV:

string csv = @"Id, Name, City
1, Tom, NY
2, Mark, NJ
3, Lou, FL
4, Smith, PA
5, Raj, DC
";

StringBuilder sb = new StringBuilder();

using (var p = ChoCSVReader.LoadText(csv)
    .WithFirstLineHeader()
    )
{
    using (var w = new ChoXmlWriter(sb)
        .Configure(c => c.RootName = "Employees")
        .Configure(c => c.NodeName = "Employee")
        )
        w.Write(p);
}

Console.WriteLine(sb.ToString());

输出Xml:

<Employees>
  <Employee>
    <Id>1</Id>
    <Name>Tom</Name>
    <City>NY</City>
  </Employee>
  <Employee>
    <Id>2</Id>
    <Name>Mark</Name>
    <City>NJ</City>
  </Employee>
  <Employee>
    <Id>3</Id>
    <Name>Lou</Name>
    <City>FL</City>
  </Employee>
  <Employee>
    <Id>4</Id>
    <Name>Smith</Name>
    <City>PA</City>
  </Employee>
  <Employee>
    <Id>5</Id>
    <Name>Raj</Name>
    <City>DC</City>
  </Employee>
</Employees>

查看CodeProject文章以获取其他帮助。

免责声明:我是这个图书馆的作者。

答案 4 :(得分:0)

此处提供了不使用嵌套LINQ的解决方案,更易于理解。

  • 使用Linq转换为Xml。
  • 支持其他定界符(const)
  • 支持每行具有不同的切片

input.csv的内容:

A,B,C
D,E,F
G,H

流程代码:

Program.cs

using System;
using System.IO;
using System.Linq;
using System.Xml.Linq;

namespace CSVtoXML
{
    class Program
    {
        private static void AddContentForEachLine(string line, ref XElement xmlTree)
        {
            var currentTree = new XElement("Item");
            const string delimiter = ",";     // Can be changed based on the actual situation
            string[] slices = line.Split(delimiter);

            for (int i = 0; i < slices.Count(); i++)
                currentTree.Add(new XElement($"Column{i}", slices[i].ToString()));

            xmlTree.Add(currentTree);
        }

        static void Main(string[] args)
        {
            var basePath = Environment.CurrentDirectory;
            var lines = File.ReadAllLines(Path.Combine(basePath, "../../..", @"input.csv"));

            var xmlTree = new XElement("TopElement");

            foreach (var line in lines)
            {
                AddContentForEachLine(line, ref xmlTree);
            }

            xmlTree.Save(Path.Combine(basePath, "../../..", @"output.xml"));
        }
    }
}

运行代码后,结果如下:

<?xml version="1.0" encoding="utf-8"?>
<TopElement>
  <Item>
    <Column0>A</Column0>
    <Column1>B</Column1>
    <Column2>C</Column2>
  </Item>
  <Item>
    <Column0>D</Column0>
    <Column1>E</Column1>
    <Column2>F</Column2>
  </Item>
  <Item>
    <Column0>G</Column0>
    <Column1>H</Column1>
  </Item>
</TopElement>


可以在此处查看此代码的完整Visual Studio解决方案: https://github.com/yanglr/dotnetInterview/tree/master/CSVtoXML