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CSVHelperで配列として初期化する

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CSVに配列のカラムを定義したくなったのでメモ

使用ライブラリ

今回使用したサンプル

読み込んだCSVファイル

ID,name,link,param[0],param[1],param[2]
1,example,http://www.example.com,1,2,3
2,example2,http://www.excample2.com,3,4,5
using System;
using CsvHelper;
using CsvHelper.Configuration;
using System.IO;
using System.Collections.Generic;
using System.Linq;

namespace csv_mapping
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            var csv = new CsvReader(new StreamReader("test.csv"));
            csv.Configuration.RegisterClassMap<TestMap>();
            foreach (var t in csv.GetRecords<Test>())
            {
                Console.WriteLine(t.ToString());
            }

        }
    }

    public sealed class TestMap : CsvClassMap<Test>
    {

        public TestMap()
        {
            Map(t => t.ID);
            Map(t => t.name);
            Map(t => t.link);
            Map(t => t.param).ConvertUsing(row => {
                var result = new List<int>();
                result.Add(row.GetField<int>("param[0]"));
                result.Add(row.GetField<int>("param[1]"));
                result.Add(row.GetField<int>("param[2]"));
                return result;
            });
        }
    }

    public class Test
    {
        public int ID { get; set; }

        public string name { get; set; }

        public string link { get; set; }

        public List<int> param { get; set; }


        public override string ToString()
        {
            return string.Format("[Test: ID={0}, name={1}, link={2}, param={3}]", ID, name, link, param.toString());
        }
    }

    public static class Extension
    {
        public static string toString<T>(this IEnumerable<T> self)
        {
            return  string.Join(",", Array.ConvertAll<T, string>(self.ToArray(), o => o.ToString())); 
        }
    }
}

確認結果

[Test: ID=1, name=example, link=http://www.example.com, param=1,2,3]
[Test: ID=2, name=example2, link=http://www.excample2.com, param=3,4,5]
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