方法一：利用System.IO.DriveInfo.GetDrives方法来获取

///           /// 获取指定驱动器的空间总大小(单位为B)         ///           ///  只需输入代表驱动器的字母即可 （大写）         ///            public static long GetHardDiskSpace(string str_HardDiskName)         {             long totalSize= new long();             str_HardDiskName=str_HardDiskName +":\\";             System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();             foreach (System.IO.DriveInfo drive in drives)             {                 if (drive.Name == str_HardDiskName)                 {                    totalSize = drive.TotalSize / (1024 * 1024 * 1024);                 }             }             return totalSize;         }        ///           /// 获取指定驱动器的剩余空间总大小(单位为B)         ///           ///  只需输入代表驱动器的字母即可          ///            public static long GetHardDiskFreeSpace(string str_HardDiskName)         {             long freeSpace = new long();             str_HardDiskName = str_HardDiskName + ":\\";             System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();             foreach (System.IO.DriveInfo drive in drives)             {                 if (drive.Name == str_HardDiskName)                 {                    freeSpace = drive.TotalFreeSpace / (1024 * 1024 * 1024);                 }             }             return freeSpace;         }

方法二：利用ManagementClass("Win32_LogicalDisk")来获取

List<Dictionary<string, string>> diskInfoDic = new List<Dictionary<string, string>>();ManagementClass diskClass = new ManagementClass("Win32_LogicalDisk");			ManagementObjectCollection disks = diskClass.GetInstances();			foreach(ManagementObject disk in disks)			{				Dictionary<string, string> diskInfo = new Dictionary<string, string>();				try				{					// 磁盘名称					diskInfo["Name"] =disk["Name"].ToString();					// 磁盘描述					diskInfo["Description"]=disk["Description"].ToString();					// 磁盘总容量，可用空间，已用空间					if (System.Convert.ToInt64(disk["Size"]) > 0)					{						long totalSpace = System.Convert.ToInt64(disk["Size"]) / MB;						long freeSpace = System.Convert.ToInt64(disk["FreeSpace"]) / MB;						long usedSpace = totalSpace - freeSpace;                        			diskInfo["totalSpace"]=totalSpace.ToString();						diskInfo["usedSpace"]=usedSpace.ToString();						diskInfo["freeSpace"]=freeSpace.ToString();					}					diskInfoDic.Add(diskInfo);				}				catch(Exception ex)				{					Throw ex;				}			}

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C# 获取磁盘空间大小的方法