C#图片切割、图片压缩、缩略图生成代码汇总

/// 图片切割函数 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="xNum">在Ｘ轴上的切割数量</param> /// <param name="yNum">在Ｙ轴上的切割数量</param> /// <param name="quality">质量压缩比</param> /// <param name="outputFile">输出文件名，不带后缀</param> /// <returns>成功返回true，失败则返回false</returns> public static bool imageCut(String sourceFile, int xNum, int yNum, long quality, String outputFile) {  try  {   long imageQuality      = quality;   Bitmap sourceImage      = new Bitmap(sourceFile);   ImageCodecInfo myImageCodecInfo   = GetEncoderInfo("image/jpeg");   Encoder myEncoder      = Encoder.Quality;   EncoderParameters myEncoderParameters = new EncoderParameters(1);   EncoderParameter myEncoderParameter  = new EncoderParameter(myEncoder, imageQuality);   myEncoderParameters.Param[0]    = myEncoderParameter;   float xWidth        = sourceImage.Width / xNum;   float yWidth        = sourceImage.Height / yNum;   String outputImage      = "";       for (int countY = 0; countY < yNum; countY++)    for (int countX = 0; countX < xNum; countX++)    {      RectangleF cloneRect    = new RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth);     Bitmap newImage     = sourceImage.Clone(cloneRect, PixelFormat.Format24bppRgb);     outputImage      = outputFile + countX + countY + ".jpg";     newImage.Save(outputImage, myImageCodecInfo, myEncoderParameters);     }   return true;  }  catch  {   return false;  }  } #endregion imageCut  imageCompress#regionimageCompress /**//// <summary> /// 图片压缩函数 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="ouputFile">输出文件名,请用 .jpg 后缀 </param> /// <returns>成功返回true，失败则返回false</returns> public static bool imageCompress(String sourceFile,long quality,String outputFile) {  try  {   long imageQuality      = quality;   Bitmap sourceImage      = new Bitmap(sourceFile);   ImageCodecInfo myImageCodecInfo  = GetEncoderInfo("image/jpeg");   Encoder myEncoder      = Encoder.Quality;   EncoderParameters myEncoderParameters = new EncoderParameters(1);   EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);   myEncoderParameters.Param[0]   = myEncoderParameter;      sourceImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);   return true;   }  catch  {   return false;  }  } #endregion imageCompress  getThumImage#region getThumImage /**//// <summary> /// 生成缩略图 /// </summary> /// <param name="sourceFile">原始图片文件</param> /// <param name="quality">质量压缩比</param> /// <param name="multiple">收缩倍数</param> /// <param name="outputFile">输出文件名</param> /// <returns>成功返回true,失败则返回false</returns> public static bool getThumImage(String sourceFile, long quality, int multiple, String outputFile) {  try  {   long imageQuality      = quality;   Bitmap sourceImage      = new Bitmap(sourceFile);   ImageCodecInfo myImageCodecInfo  = GetEncoderInfo("image/jpeg");   Encoder myEncoder      = Encoder.Quality;   EncoderParameters myEncoderParameters = new EncoderParameters(1);   EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);   myEncoderParameters.Param[0]   = myEncoderParameter;   float xWidth       = sourceImage.Width;   float yWidth       = sourceImage.Height;   Bitmap newImage      = new Bitmap((int)(xWidth /multiple), (int)(yWidth /multiple));   Graphics g        = Graphics.FromImage(newImage);       g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);   g.Dispose();   newImage.Save(outputFile,myImageCodecInfo,myEncoderParameters);   return true;  }  catch  {   return false;  } } #endregion getThumImage  ImageCodecInfo#region ImageCodecInfo /**//// <summary> /// 获取图片编码信息 /// </summary> private static ImageCodecInfo GetEncoderInfo(String mimeType) {  int j;  ImageCodecInfo[] encoders;  encoders = ImageCodecInfo.GetImageEncoders();  for (j = 0; j < encoders.Length; ++j)  {   if (encoders[j].MimeType == mimeType)    return encoders[j];  }  return null; }