ドライブの容量と空き領域を取得する

各ドライブの容量と空き領域を取得するサンプルです。

「C#でドライブ毎のディスク容量と空き容量取得」と「C#の匿名型について調べてみた」、「匿名型の入れ子や匿名型配列が作れる」を参考にさせていただきました。

using System;
using System.Linq;

namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            foreach (var drive in System.IO.DriveInfo.GetDrives())
            {
                if (!drive.IsReady) continue;
                Console.WriteLine("{0} ({1}) 空き領域 {2}/{3}",
                    drive.VolumeLabel,
                    drive.RootDirectory.Name,
                    PrettyFormat(drive.TotalFreeSpace),
                    PrettyFormat(drive.TotalSize));
            }
        }

        private static string PrettyFormat(double value)
        {
            var data = new[]
            {
                new { max = 1024d,                    baseValue = 1d,                f = 1,   format = "{0:0} byte" },
                new { max = Math.Pow(1024, 1) * 10,   baseValue = Math.Pow(1024, 1), f = 100, format = "{0:0.00} KB" },
                new { max = Math.Pow(1024, 1) * 100,  baseValue = Math.Pow(1024, 1), f = 10,  format = "{0:0.0} KB" },
                new { max = Math.Pow(1024, 1) * 1000, baseValue = Math.Pow(1024, 1), f = 1,   format = "{0:0} KB" },
                new { max = Math.Pow(1024, 2) * 10,   baseValue = Math.Pow(1024, 2), f = 100, format = "{0:0.00} MB" },
                new { max = Math.Pow(1024, 2) * 100,  baseValue = Math.Pow(1024, 2), f = 10,  format = "{0:0.0} MB" },
                new { max = Math.Pow(1024, 2) * 1000, baseValue = Math.Pow(1024, 2), f = 1,   format = "{0:0} MB" },
                new { max = Math.Pow(1024, 3) * 10,   baseValue = Math.Pow(1024, 3), f = 100, format = "{0:0.00} GB" },
                new { max = Math.Pow(1024, 3) * 100,  baseValue = Math.Pow(1024, 3), f = 10,  format = "{0:0.0} GB" },
                new { max = Math.Pow(1024, 3) * 1000, baseValue = Math.Pow(1024, 3), f = 1,   format = "{0:0} GB" },
                new { max = Math.Pow(1024, 4) * 10,   baseValue = Math.Pow(1024, 4), f = 100, format = "{0:0.00} TB" },
                new { max = Math.Pow(1024, 4) * 100,  baseValue = Math.Pow(1024, 4), f = 10,  format = "{0:0.0} TB" },
                new { max = Math.Pow(1024, 4) * 1000, baseValue = Math.Pow(1024, 4), f = 1,   format = "{0:0} TB" },
                new { max = Math.Pow(1024, 5) * 10,   baseValue = Math.Pow(1024, 5), f = 100, format = "{0:0.00} PB" },
                new { max = Math.Pow(1024, 5) * 100,  baseValue = Math.Pow(1024, 5), f = 10,  format = "{0:0.0} PB" },
                new { max = Math.Pow(1024, 5) * 1000, baseValue = Math.Pow(1024, 5), f = 1,   format = "{0:0} PB" },
            };
            var datum = data.FirstOrDefault(_ => value < _.max);
            if (datum == null) return string.Format("{0:0.00} EB", value / Math.Pow(1024, 6));
            var v = Math.Floor(value / datum.baseValue * datum.f) / datum.f;
            return string.Format(datum.format, v);
        }
    }
}