在MVC3中使用C＃更改圖像大小？

Question

[HttpPost]
public ActionResult AddImage(Image model)
{
   if (model.ImageData != null && model.ImageData.ContentLength > 0)
   {
      var fileName = Path.GetFileName(model.ImageData.FileName);
      var pathBig = Path.Combine(Server.MapPath("~/UploadedImages"), fileName);
      var pathSmall = Path.Combine(Server.MapPath("~/UploadedImages"), "small_" + fileName);


      // --> How to change image size to big(800 x 600)
     //      and small (100x80) and save them?

      model.ImageData.SaveAs(pathBig);
      model.ImageData.SaveAs(pathSmall);
   }
}

如何將圖像大小更改為大（800 x 600）到小（100x80）並保存？

Answer 1

你可以嘗試這個庫： http ： //nuget.org/packages/ImageResizer

它確實支持asp.net-mvc： http ： //imageresizing.net/

或者你可以得到一個純粹的C＃lib並在你的應用程序上使用它。 看這些帖子：
調整圖像大小C＃
https://stackoverflow.com/a/2861813/368070

我發現這個片段： http ： //snippets.dzone.com/posts/show/4336

Answer 2

從框架方法本身執行此操作的最簡單方法是使用Graphics類的DrawImage（）方法。

示例代碼可能是：

//For first scale
Bitmap bmp = new Bitmap(800, 600);
Graphics gf = Graphics.FromImage(bmp);
Image userpic = Image.FromStream(/*pass here the image byte stream*/)
gf.DrawImage(userpic, new Rectangle(0,0,800,600))
gf.Save(/* the save path */);

//For second scale
Bitmap bmp = new Bitmap(100, 80);
Graphics gf = Graphics.FromImage(bmp);
Image userpic = Image.FromStream(/*pass here the image byte stream*/)
gf.DrawImage(userpic, new Rectangle(0,0,100,80))
gf.Save(/* the save path */);