C# 根据时间创建文件夹

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string file = ((fileNameIndex)index).ToString();                    if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/upload/") + ((fileNameIndex)index).ToString()))                        Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/upload/") + ((fileNameIndex)index).ToString());                      if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/upload/") + file + "/" + DateTime.Now.ToString("yyyy")))                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/admin/upload/") + file + "/" + DateTime.Now.ToString("yyyy"));                      if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM"))))                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM")));                      if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd"))))                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd")));                        if (!Directory.Exists(HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd"))))                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd")));                      imgsrc = HttpContext.Current.Server.MapPath("~/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd/") + img);                    imgsrc = "/admin/upload/" + file + "/" + DateTime.Now.ToString("yyyy/MM/dd/") + img;