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 ASP.NET中生成縮略圖，只需你給定要生成的圖片路徑,生成后存放的服務(wù)器路徑，生成方式，生成的尺寸，還有生成后的圖片類型，即可為你生成合適的縮略圖。先必須導(dǎo)入 using System.Drawing;

    代碼如下:

01.        // <summary> 
02.        /// 生成縮略圖 
03.        /// </summary> 
04.        /// <param name="originalImagePath">源圖路徑</param> 
05.        /// <param name="thumbnailPath">縮略圖路徑</param> 
06.        /// <param name="width">縮略圖寬度</param> 
07.        /// <param name="height">縮略圖高度</param> 
08.        /// <param name="mode">生成縮略圖的方式:HW指定高寬縮放(可能變形);W指定寬，高按比例 H指定高，寬按比例 Cut指定高寬裁減(不變形)</param>　　 
09.        /// <param name="mode">要縮略圖保存的格式(gif,jpg,bmp,png) 為空或未知類型都視為jpg</param>　　 
10.        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, string imageType) 
11.        { 
12.            Image originalImage = Image.FromFile(originalImagePath); 
13.            int towidth = width; 
14.            int toheight = height; 
15.            int x = 0; 
16.            int y = 0; 
17.            int ow = originalImage.Width; 
18.            int oh = originalImage.Height; 
19.20.            switch (mode) 
21.            { 
22.                case "HW"://指定高寬縮放（可能變形）　　　　　　　　 
23.                    break; 
24.                case "W"://指定寬，高按比例　　　　　　　　　　 
25.                    toheight = originalImage.Height * width / originalImage.Width; 
26.                    break; 
27.                case "H"://指定高，寬按比例 
28.                    towidth = originalImage.Width * height / originalImage.Height; 
29.                    break; 
30.                case "Cut"://指定高寬裁減（不變形）　　　　　　　　 
31.                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) 
32.                    { 
33.                        oh = originalImage.Height; 
34.                        ow = originalImage.Height * towidth / toheight; 
35.                        y = 0; 
36.                        x = (originalImage.Width - ow) / 2; 
37.                    } 
38.                    else 
39.                    { 
40.                        ow = originalImage.Width; 
41.                        oh = originalImage.Width * height / towidth; 
42.                        x = 0; 
43.                        y = (originalImage.Height - oh) / 2; 
44.                    } 
45.                    break; 
46.                default: 
47.                    break; 
48.            } 
49.            //新建一個bmp圖片 
50.            Image bitmap = new System.Drawing.Bitmap(towidth, toheight); 
51.52.            //新建一個畫板 
53.            Graphics g = System.Drawing.Graphics.FromImage(bitmap); 
54.55.            //設(shè)置高質(zhì)量插值法 
56.            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 
57.58.            //設(shè)置高質(zhì)量,低速度呈現(xiàn)平滑程度 
59.            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
60.61.            //清空畫布并以透明背景色填充 
62.            g.Clear(Color.Transparent); 
63.64.            //在指定位置并且按指定大小繪制原圖片的指定部分 
65.            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), 
66.              new Rectangle(x, y, ow, oh), 
67.              GraphicsUnit.Pixel); 
68.69.            try 
70.            { 
71.                //以jpg格式保存縮略圖 
72.                switch (imageType.ToLower()) 
73.                { 
74.                    case "gif": 
75.                        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif); 
76.                        break; 
77.                    case "jpg": 
78.                        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); 
79.                        break; 
80.                    case "bmp": 
81.                        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp); 
82.                        break; 
83.                    case "png": 
84.                        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png); 
85.                        break; 
86.                    default: 
87.                        bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); 
88.                        break; 
89.                } 
90.            } 
91.            catch (System.Exception e) 
92.            { 
93.                throw e; 
94.            } 
95.            finally 
96.            { 
97.                originalImage.Dispose(); 
98.                bitmap.Dispose(); 
99.                g.Dispose(); 
100.            } 
101.        }