C#改变图片尺寸大小和质量

using System;using System.IO;using System.Collections;using System.Drawing;/not in thisusing System.Drawing.Drawing2D;using System.Drawing.Imaging;/in this ImageFormat.Jpegpublic static void resize_pic(string szdir,int width,int height) int i = 0; Image img=null; Image bmcpy=null; Graphics gh=null; string szsavedir = Directory.CreateDirectory(szdir + formatedpic1).FullName.ToString(); string szfiles = Directory.GetFiles(szdir, *.jpg); foreach (string szfile in szfiles) img = Image.FromFile(szfile); bmcpy = new Bitmap(width, height); gh = Graphics.FromImage(bmcpy); gh.DrawImage(img, new Rectangle(0, 0, width, height); bmcpy.Save(szsavedir + i.ToString() + .jpg,ImageFormat.Jpeg); i+; gh.Dispose(); bmcpy.Dispose(); img.Dispose(); Console.WriteLine(0 pictures have been resized,i); static void rebdqulity_pic(string szdir,long lqulity) int i=0; Bitmap myBitmap; ImageCodecInfo myImageCodecInfo; Encoder myEncoder; EncoderParameter myEncoderParameter; EncoderParameters myEncoderParameters; / Get an ImageCodecInfo object that represents the JPEG codec. myImageCodecInfo = GetEncoderInfo(image/jpeg); myEncoder = Encoder.Quality; myEncoderParameters = new EncoderParameters(1); myEncoderParameter = new EncoderParameter(myEncoder, lqulity); myEncoderParameters.Param0 = myEncoderParameter; string szsavedir = Directory.CreateDirectory(szdir + formatedpic1).FullName.ToString(); string szfiles = Directory.GetFiles(szdir, *.jpg); foreach (string szfile in szfiles) myBitmap = new Bitmap(szfile); myBitmap.Save(szsavedir+quli+i.ToString()+.jpg, myImageCodecInfo, myEncoderParameters); i+; private static ImageCodecInfo GetEncoderInfo(String mimeType) int j; ImageCodecInfo encoders; encoders = ImageCodecInfo.GetImageEncoders(); for (j = 0; j encoders.Length; +j) if (encodersj.MimeType = mimeType) return encodersj; return null; public static void resize_pic(int width,int height) int i = 0; Image img=null; Image bmcpy=null; Graphics gh=null; Directory.CreateDirectory( formatedpic1); string szcdir = Environment.CurrentDirectory; string szfiles = Directory.GetFiles(szcdir); foreach (string szfile in szfiles) string sz_ex = Path.GetExtension(szfile); if (sz_ex = .jpg| sz_ex = .bmp|sz_ex = .png|sz_ex = .gif) img = Image.FromFile(szfile); bmcpy = new Bitmap(width, height); gh = Graphics.FromImage(bmcpy); gh.DrawImage(img, new Rectangle(0, 0, width, height