怎样同时压缩图片的大小和长宽?

怎样同时压缩图片的大小和长宽? 这个只。我想设置压缩后的图片的长宽，该怎么设置呢？ EncoderParameters encParams = new EncoderParameters( 1 ); // 65%品质的JPEG格式图片 encParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 65L); ImageCodecInfo codeInfo = null; ImageCodecInfo[] codeInfos = ImageCodecInfo.GetImageEncoders(); foreach(ImageCodecInfo info in codeInfos) { if(info.MimeType.Equals("image/jpeg")) { codeInfo = info; break; } } // targetImage为目标图片 if(codeInfo != null) { System.Drawing.Image img = System.Drawing.Image.FromStream(file1.PostedFile.InputStream,true); string s = Server.MapPath( "/bin")+"1.jpg" ; img.Save(s , codeInfo, encParams); } public void pic_zero(string sourcepath,string aimpath,int scale) { string originalFilename =sourcepath; //生成的高质量图片名称 string strGoodFile =aimpath; //从文件取得图片对象 System.Drawing.Image image = System.Drawing.Image.FromFile(originalFilename); int iImgWidth = image.Width; int iImgHeight = image.Height; int iScale = (iImgWidth / scale)>(iImgHeight/scale) ? (iImgWidth / scale) : (iImgHeight / scale); //取得图片大小 System.Drawing.Size size = new Size(image.Width / iScale , image.Height / iScale); //新建一个bmp图片 System.Drawing.Image bitmap = new System.Drawing.Bitmap(size.Width,size.Height); //新建一个画板 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空一下画布 g.Clear(Color.Blue); //在指定位置画图 g.DrawImage(image, new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), new System.Drawing.Rectangle(0, 0, image.Width,image.Height), System.Drawing.GraphicsUnit.Pixel); //保存高清晰度的缩略图 bitmap.Save(strGoodFile, System.Drawing.Imaging.ImageFormat.Jpeg); g.Dispose(); } asp.net 2.0中判断上传的图片是否符合规格 在asp.net 2.0中，在上传图片时，有时往往要判断用户上传的图片是否符合指定规格，如果不符合规格， 则不予以上传，那么可以用以下的代码片段进行判断。 首先在web.config文件中设置图片上传的限制尺寸，比如 之后，在页面获得web.config文件里预先设定的尺寸 if (Page.IsPostBack) { height = Convert.ToInt32( ConfigurationManager.AppSettings.Get("RequiredHeight")); width = Convert.ToInt32( ConfigurationManager.AppSettings.Get("RequiredWidth")); } 之后在“上传”按钮的事件代码中如下编写 if (Page.IsValid) { if (FileUpload1.HasFile) { string extension = Path.GetExtension(FileUpload1.PostedFile.FileName); switch (extension.ToLower()) { case ".gif": case "jpg": try { //如果符合尺寸 if (ValidateFileDimensions()) { string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName); string saveAsName = Path.Combine(Server.MapPath("~/Uploads/"), fileName); FileUpload1.PostedFile.SaveAs(saveAsName); lblSucces.Visible = true; } else { valInvalidDimensions.IsValid = false; valInvalidDimensions.ErrorMessage = String.Format(valInvalidDimensions.ErrorMessage, height, width); } } catch { // Unable to read the file dimensions. The uploaded file is probably not an image. valInvalidFile.IsValid = false; } break; default: // The uploaded file has an incorrect extension valInvalidFile.IsValid = false; break; } } } public bool ValidateFileDimensions() { using (System.Drawing.Image myImage = System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream)) { return (myImage.Height == height && myImage.Width == width); } } 要留意其中ValidateFileDimensions()中完成了判断尺寸的过程了 最后，页面放一些验证控件