原理是当目标路径不存在时循环创建分级目录,其它没什么,大家看代码吧.

class DirFileUtil
{
    public static void CopyFile(String fileFrom,String fileTo)
    {
        String[] folders = fileTo.Split('\');

        String dir=folders[0];
        for (int i = 1; i < folders.Length-1;i++ )
        {
            dir += "\" + folders[i];

            MakeWhenFolderNotExist(dir);
        }

        File.Copy(fileFrom,fileTo);
    }

    public static void MakeWhenFolderNotExist(String folder)
    {
        DirectoryInfo directoryInfo = new DirectoryInfo(folder);
        if (directoryInfo.Exists == false)
        {
            directoryInfo.Create();
        }
    }
}