C#图片切割、图片压缩、缩略图生成代码汇总

概述本文为大家整理了C#图片切割、图片压缩、缩略图生成的实现代码，大家可以收藏，方便以后使用，具体内容如下

本文为大家整理了C#图片切割、图片压缩、缩略图生成的实现代码，大家可以收藏，方便以后使用，具体内容如下

/// 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,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,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,int multiple,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,xWIDth / multiple,yWIDth / multiple);   g.dispose();   newImage.Save(outputfile,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; }

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