C# 实现图片压缩

代码：

private static imagecodecinfo getimagecodecinfo(imageformat imageformat)
{
    imagecodecinfo[] imagecodecinfoarr = imagecodecinfo.getimagedecoders();
    foreach (imagecodecinfo imagecodecinfo in imagecodecinfoarr)
    {
        if (imagecodecinfo.formatid == imageformat.guid)
        {
            return imagecodecinfo;
        }
    }
    return null;
}

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代码：

memorystream ms = httputil.httpdownloadfile(url);
bitmap bmp = new bitmap(ms);

encoderparameters encoderparameters = new encoderparameters(1);
encoderparameter encoderparameter = new encoderparameter(system.drawing.imaging.encoder.quality, 75l);
encoderparameters.param[0] = encoderparameter;

memorystream mscompress = new memorystream();
bmp.save(mscompress, getimagecodecinfo(imageformat.jpeg), encoderparameters);
bitmap bmpcompress = new bitmap(mscompress);
bmpcompress.save(path);
bmp.save(path2);

mscompress.close();
ms.close();

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