原博客地址：https://blog.csdn.net/xiao_rory/article/details/8058814

private DirectoryInfo createImgFolder(string filefullpath) 
{
    DirectoryInfo dir = null;
    if (!File.Exists(filefullpath))
    {
    //string dirpath = filefullpath.Substring(0, filefullpath.LastIndexOf(‘\\‘));
    string[] pathes = filefullpath.Split(‘\\‘);
    if (pathes.Length > 1)
    {
        string path = pathes[0];
        for (int i = 1; i < pathes.Length; i++)
        {
        path += "\\" + pathes[i];
        if (!Directory.Exists(path))
        {
            dir = Directory.CreateDirectory(path);
        }
        }
    }
    }
    return dir;
}

运行：
参数：D:\workspace-mars\imgserver\IMGPATH\ImgFiles\20190531