[DllImport( " kernel32.dll " )]
???????? private ? static ? extern ? bool ?GetDiskFreeSpaceEx(
???????? string ?lpDirectoryName,? out ? ulong ?lpFreeBytesAvailable,? out ? ulong ?lpTotalNumberOfBytes,? out ? ulong ?lpTotalNumberOfFreeBytes);

???????? /// ? <summary>
???????? /// ?取得磁盤剩余空間
???????? /// ? </summary>
???????? /// ? <param?name="driveDirectoryName"> 驅動器名 </param>
???????? /// ? <returns> 剩余空間 </returns>
???????? private ? ulong ?GetFreeSpace( string ?driveDirectoryName)
????????{
???????????? ulong ?freeBytesAvailable,?totalNumberOfBytes,?totalNumberOfFreeBytes;
????????????GetDiskFreeSpaceEx(driveDirectoryName,? out ?freeBytesAvailable,? out ?totalNumberOfBytes,? out ?totalNumberOfFreeBytes);
???????????? return ?freeBytesAvailable;
????????}