using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO;using System.Drawing;using System.Drawing.Drawing2D;namespace MvcApplication4.Utils{public static class FileUpload    {public static char DirSeparator =        System.IO.Path.DirectorySeparatorChar;public static string FilesPath = "Content" +        DirSeparator + "Uploads" + DirSeparator;public static string UploadFile(HttpPostedFileBase file)        {            ...// 保存缩略图            ResizeImage(file, 150, 100);            ...        }public static void DeleteFile(string fileName)        {// 如果没有指定文件名就什么都不做            if (fileName.Length == 0) return;// 设置删除路径            string path = FilesPath + DirSeparator + fileName;string thumbPath = FilesPath + DirSeparator +"Thumbnails" + DirSeparator + fileName;            RemoveFile(path);            RemoveFile(thumbPath);        }private static void RemoveFile(string path)        {// 检查文件是否存在            if (File.Exists(Path.GetFullPath(path)))            {// 删除文件                File.Delete(Path.GetFullPath(path));            }        }public static void ResizeImage(HttpPostedFileBase file,int width, int height)        {string thumbnailDirectory =            String.Format(@"{0}{1}{2}", FilesPath,            DirSeparator, "Thumbnails");// 检查目标文件夹是否存在            if (!Directory.Exists(thumbnailDirectory))            {// 假如文件夹不存在就创建它                Directory.CreateDirectory(thumbnailDirectory);            }// 设置缩略图保存路径            string imagePath =            String.Format(@"{0}{1}{2}", thumbnailDirectory,            DirSeparator, file.FileName);// 将文件流保存到磁盘            FileStream stream = new FileStream(Path.GetFullPath(            imagePath), FileMode.OpenOrCreate);// 缩放上传的文件            Image OrigImage = Image.FromStream(file.InputStream);// 创建缩略图对象            Bitmap TempBitmap = new Bitmap(width, height);// 创建缩略图画质            Graphics NewImage = Graphics.FromImage(TempBitmap);            NewImage.CompositingQuality =            CompositingQuality.HighQuality;            NewImage.SmoothingMode =            SmoothingMode.HighQuality;            NewImage.InterpolationMode =            InterpolationMode.HighQualityBicubic;// 创建Rectangle对象进行绘制            Rectangle imageRectangle = new Rectangle(0, 0,            width, height);            NewImage.DrawImage(OrigImage, imageRectangle);// 保存缩略图            TempBitmap.Save(stream, OrigImage.RawFormat);// 释放资源            NewImage.Dispose();            TempBitmap.Dispose();            OrigImage.Dispose();            stream.Close();            stream.Dispose();        }    }}