static void Main(string[] args)         {             string savePath = @"E:\2013相片\上传前\";             string sourcePath = @"E:\2013相片\QQ空间使用\";             string sourceName = "DSC_0216.JPG";             int scale = 5;             Image img = Image.FromFile(sourcePath + sourceName);             int width = img.Width / scale;             int height = img.Height / scale;             Image imgNew = new Bitmap(width, height);             Graphics g = Graphics.FromImage(imgNew);             g.DrawImage(img, new System.Drawing.Rectangle(0, 0, width, height),             new System.Drawing.Rectangle(0, 0, img.Width, img.Height),             System.Drawing.GraphicsUnit.Pixel);             imgNew.Save(savePath + "a.jpg", ImageFormat.Jpeg);         }

class Program     {         static readonly string[] IMAGE_EXTNAME = new string[] { "jpg"};         static void Main(string[] args)         {             string savePath = @"E:\2013相片\上传前\";             string sourcePath = @"E:\2013相片\QQ空间使用\";             int scale = 5;             List<string> imageNames = GetImageNames(sourcePath);             if (imageNames != null && imageNames.Count > 0)             {                 foreach (var item in imageNames)                 {                     SaveSmallPhoto(sourcePath + item, scale, savePath + item);                 }             }         }         /// <summary>         /// 获取路径下所有符合指定图片后缀文件名         /// </summary>         /// <param name="path">路径</param>         /// <returns></returns>         static List<string> GetImageNames(string path)         {             string[] fileNames = Directory.GetFiles(path);             if (fileNames == null || fileNames.Length == 0)             {                 return null;             }             List<string> imageNames = new List<string>();             foreach (var item in fileNames)             {                 if (ExistsInExtName(item, IMAGE_EXTNAME))                 {                     imageNames.Add(item.Substring(item.LastIndexOf('\\') + 1));                 }             }             return imageNames;         }         /// <summary>         /// 判断文件名是否符合指定后缀名         /// </summary>         /// <param name="name">文件名</param>         /// <param name="extNames">符合要求的后缀名</param>         /// <returns></returns>         static bool ExistsInExtName(string name, string[] extNames)         {             if (string.IsNullOrEmpty(name) || extNames == null || extNames.Length == 0)             {                 return false;             }             foreach (var item in extNames)             {                 if (name.ToLower().EndsWith(item))                 {                     return true;                 }             }             return false;         }         /// <summary>         /// 将图片按比例缩小保存         /// </summary>         /// <param name="fromPath">原图片路径名</param>         /// <param name="scale">缩小比例</param>         /// <param name="toPath">缩小后保存的路径名</param>         static void SaveSmallPhoto(string fromPath, int scale, string toPath)         {             int width, height;             using (Image img = Image.FromFile(fromPath))             {                 width = img.Width / scale;                 height = img.Height / scale;                 using (Image imgNew = new Bitmap(width, height))                 {                     using (Graphics g = Graphics.FromImage(imgNew))                     {                         g.DrawImage(img, new Rectangle(0, 0, width, height),                             new Rectangle(0, 0, img.Width, img.Height), System.Drawing.GraphicsUnit.Pixel);                     }                     imgNew.Save(toPath, ImageFormat.Jpeg);                 }             }         }     }