按比例缩放图片 1/**//// <summary> 2 /// 按比例缩放图片 3 /// </summary> 4 /// <param name="imgUrl">图片的路径</param> 5 /// <param name="imgHeight">图片的高度</param> 6 /// <param name="imgWidth">图片的宽度</param> 7 /// <returns></returns> 8 public static string GetImageSize(string imgUrl,int imgHeight,int imgWidth) 9 {10 string fileName = System.Web.HttpContext.Current.Server.MapPath(imgUrl);11 string strResult = string.Empty;12 if(System.IO.File.Exists(fileName) && imgHeight != 0 && imgWidth != 0)13 {14 decimal desWidth;decimal desHeight; //目标宽高15 System.Drawing.Image objImage = System.Drawing.Image.FromFile(fileName);16 decimal radioAct = (decimal)objImage.Width/(decimal)objImage.Height; //原始图片的宽高比17 decimal radioLoc = (decimal)imgWidth/(decimal)imgHeight; //图片位的宽高比18 if(radioAct > radioLoc) //原始图片比图片位宽19 { 20 decimal dcmZoom = (decimal)imgWidth/(decimal)objImage.Width;21 desHeight = objImage.Height*dcmZoom;22 desWidth = imgWidth;23 }24 else25 {26 decimal dcmZoom = (decimal)imgHeight/(decimal)objImage.Height;27 desWidth = objImage.Width*dcmZoom;28 desHeight = imgHeight;29 }30 objImage.Dispose(); //释放资源31 strResult = "width=\"" + Convert.ToString((int)desWidth) + "\" height=\""32 + Convert.ToString((int)desHeight) + "\" ";33 }34 return strResult;35 }