图片上传 自动创建文件夹并重命名（带缩略图）
后台：
[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
Controller Code
缩略图类：
#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
缩略图 Code