asp.net MVC上传图片完整方法

[HttpPost]
public ActionResult WanSell_UploadPicture(ProductGalleryModels picturegm)
{ var users = Session["onlineUsers"] as List<CurrentOnlineUsers>;
string usename = users[].CUserName.ToString(); //获取用户名
string randomName = DateTime.Now.ToFileTime().ToString(); //系统当前时间为图片名称
HttpPostedFileBase file = Request.Files["fileToUpload"];//获取客户端上传的图片
string pictureName = file.FileName; //上传图片的原名
string extensionName = System.IO.Path.GetExtension(pictureName);//获取扩展名
int randomcode = BaseRandom.GetRandom(, ); //产生随机数
string newName = string.IsNullOrEmpty(pictureName.Trim()) ? "" : usename + randomcode + randomName + System.IO.Path.GetExtension(pictureName); //重命名图片
if (picturegm.ImgDescription != null && picturegm.ImgDescription != "") //附加判断图片描述是否为空
{
if (extensionName.ToLower() == "jpg" || extensionName.ToLower() == "bmp" || extensionName.ToLower() == "gif") //判断图片格式
{
string savePath = HttpContext.Server.MapPath("~/Content/Uploads/img/" + usename); //原图图片保存位置
string smalfilepath = Server.MapPath("~/Content/Uploads/smallimg/" + usename); //缩略图图片保存位置
if (!System.IO.Directory.Exists(savePath))
{
//如果路径不存在创建新文件夹
System.IO.Directory.CreateDirectory(savePath);
}
if (!System.IO.Directory.Exists(smalfilepath))
{
System.IO.Directory.CreateDirectory(smalfilepath);
}
file.SaveAs(savePath + '/' + newName); //将上传的文件保存到指定的目录。
FileFolder.MakeThumbnail(savePath + '/' + newName, smalfilepath + '/' + newName, , , "Cut");
ViewData["messageBox"] = "上传成功";
return View("~/Views/RechargeMoney/RechargeSuccess.cshtml");
}
else
{
ModelState.AddModelError("", "图片格式应为jpg/bmp/gif");
}
}
else
{
ModelState.AddModelError("", "请填写图片描述");
}
return View("~/Views/IWantSell/WanSell_UploadPicture.cshtml");
}
#endregion

#region 生成缩略图 /**/ /// <summary> /// 生成缩略图 /// </summary> /// <param name="originalImagePath">源图路径（物理路径）</param> /// <param name="thumbnailPath">缩略图路径（物理路径）</param> /// <param name="width">缩略图宽度</param> /// <param name="height">缩略图高度</param> /// <param name="mode">生成缩略图的方式</param> public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode) { System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath); int towidth = width; int toheight = height; int x = ; int y = ; int ow = originalImage.Width; int oh = originalImage.Height; switch (mode) { case "HW"://指定高宽缩放（可能变形） break; case "W"://指定宽，高按比例 toheight = originalImage.Height * width / originalImage.Width; break; case "H"://指定高，宽按比例 towidth = originalImage.Width * height / originalImage.Height; break; case "Cut"://指定高宽裁减（不变形） if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) { oh = originalImage.Height; ow = originalImage.Height * towidth / toheight; y = ; x = (originalImage.Width - ow) / ; } else { ow = originalImage.Width; oh = originalImage.Width * height / towidth; x = ; y = (originalImage.Height - oh) / ; } break; default: break; } //新建一个bmp图片 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight); //新建一个画板 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(System.Drawing.Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new System.Drawing.Rectangle(, , towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel); try { //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } } #endregion