C#图片切割、图片压缩、缩略图生成

C#图片切割、图片压缩、缩略图生成的实现代码 /// 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 #region imageCompress   /**/ /// <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 ;   }