W-ZERO3用 ディスク容量取得クラス

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace Uchukamen.WZero3
{
    public class DiskStatus
    {
        [DllImport("coredll.dll")]
        public static extern bool GetDiskFreeSpaceEx
           (
           string directory,
           ref UInt64 lpFreeBytesAvailableToCaller,
           ref UInt64 lpTotalNumberOfBytes,
           ref UInt64 lpTotalNumberOfFreeBytes
           );

        #region プロパティ
        /// <summary>
        /// The total number of free bytes on the disk
        /// that are available to the user associated with the calling thread.
        /// </summary>
        private UInt64 freeBytesAvailableToCaller = 0;
        public UInt64 FreeBytesAvailableToCaller
        {
            get { return freeBytesAvailableToCaller; }
        }

        public float FreeMB
        {
            get { return (float)freeBytesAvailableToCaller / 1024F / 1024F; }
        }
       
        /// <summary>
        /// The total number of bytes on the disk
        /// that are available to the user associated with the calling thread.
        /// </summary>
        private UInt64 totalNumberOfBytes = 0;
        public UInt64 TotalNumberOfBytes
        {
            get { return totalNumberOfBytes; }
        }

        public float TotalMB
        {
            get { return (float)totalNumberOfBytes/1024F/1024F; }
        }
       
       
        /// <summary>
        /// The total number of free bytes on the disk.
        /// </summary>
        private UInt64 totalNumberOfFreeBytes = 0;
        public UInt64 TotalNumberOfFreeBytes
        {
            get { return totalNumberOfFreeBytes; }
        }
        #endregion

        /// <summary>
        /// ディスク容量を取得する。
        /// </summary>
        /// <param name="path">ディスクのパス</param>
        public void Get(string path)
        {
            bool res = GetDiskFreeSpaceEx(
                path,
                ref freeBytesAvailableToCaller,
                ref totalNumberOfBytes,
                ref totalNumberOfFreeBytes);
        }
    }
}

呼び出し
            DiskStatus dstat = new DiskStatus();
            dstat.Get("\\");