01	/// <summary>?

02	???/// 為圖片生成縮略圖???

03	???/// </summary>?

04	???/// <param name="phyPath">原圖片的路徑</param>?

05	???/// <param name="width">縮略圖寬</param>?

06	???/// <param name="height">縮略圖高</param>?

07	???/// <returns></returns>?

08	???public?System.Drawing.Image GetThumbnail(System.Drawing.Image image,?int?width,?intheight)?

09

???{?

10	???????Bitmap bmp =?newBitmap(width, height);?

11	???????//從Bitmap創建一個System.Drawing.Graphics?

12	???????System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);?

13	???????//設置??

14	???????gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;?

15	???????//下面這個也設成高質量?

16	???????gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;?

17	???????//下面這個設成High?

18	???????gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;?

19	???????//把原始圖像繪制成上面所設置寬高的縮小圖?

20	???????System.Drawing.Rectangle rectDestination =?newSystem.Drawing.Rectangle(0, 0, width, height);?

21

????

22	???????gr.DrawImage(image, rectDestination, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel);?

23	???????returnbmp;?

24

???}

?

調用方法

查看源碼 打印?

01	HttpPostedFile file = photoFile.PostedFile;?

02	????????if(!file.ContentType.Contains("image"))?

03	????????{?

04	return"照片格式不合法";?

05	????????}?

06	????????stringext = Path.GetExtension(file.FileName).ToLower();?

07	????????if?(ext !=?".jpg"?&& ext !=?".gif"?&& ext !=?".png"&& ext !=?".jpeg")?

08	????????{?

09	return"請您上傳jpg、gif、png圖片";?

10	????????}?

11	????????if(file.ContentLength > 5 * 1024 * 1024)?

12	????????{?

13	return"請您上傳512字節內的圖片";?

14	????????}?

15	????????stringnewName = Guid.NewGuid().ToString();?

16	????????stringtempPath =?"upload/";?

17	????????stringimg = tempPath + newName + ext;?

18	????????stringfilePath = Server.MapPath(img);?

19	????????if(!Directory.Exists(tempPath))?

20	????????{?

21	????????????Directory.CreateDirectory(tempPath);?

22	????????}?

23	????????using(System.Drawing.Image originalImage = System.Drawing.Image.FromStream(file.InputStream))?

24	????????{?

25	????????????GetThumbnail(originalImage, 504, 374).Save(filePath);?

26

????????}

轉載于:https://www.cnblogs.com/gc2013/p/3652469.html

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