C#中图片切割,图片压缩,缩略图生成的代码

/// <summary>
/// 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;
}


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