asp.net 图片压缩

 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

 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;
    }
    #endregion ImageCodeInfo