public static Material Create(string description, MaterialType type, HttpPostedFileBase file, BaseDbContext db) { if (!type.Match(file)) return null; string uploadFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + Path.GetExtension(file.FileName); string absolutFileName; switch (type) { case MaterialType.Identity: absolutFileName = HttpContext.Current.Server.MapPath("~/UserUpload/") + "Identity/" + uploadFileName; break; case MaterialType.Avatar: absolutFileName = HttpContext.Current.Server.MapPath("~/UserUpload/") + "Avatar/" + uploadFileName; break; default: absolutFileName = HttpContext.Current.Server.MapPath("~/UserUpload/") + "Administrator/" + uploadFileName; break; } //执行上传 if (File.Exists(absolutFileName)) { File.Delete(absolutFileName); } file.SaveAs(absolutFileName); Material material = new Material(uploadFileName, description, type); //添加Material记录 db.Materials.Add(material); //保存更改 db.SaveChanges(); return db.Materials.Find(material.Id); }