如何在C#内存中使用JPEG或PNG压缩图像？

using System.Drawing;
using System.Drawing.Imaging;

public byte[] CompressImageToJpeg(Image image, long quality)
{
    EncoderParameters encoderParams = new EncoderParameters(1);
    encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, quality);

    ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg");
    using (MemoryStream ms = new MemoryStream())
    {
        image.Save(ms, jpegCodec, encoderParams);
        return ms.ToArray();
    }
}

private ImageCodecInfo GetEncoderInfo(string mimeType)
{
    ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
    foreach (ImageCodecInfo codec in codecs)
    {
        if (codec.MimeType == mimeType)
        {
            return codec;
        }
    }
    return null;
}

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

public byte[] CompressImageToPng(Image image)
{
    using (MemoryStream ms = new MemoryStream())
    {
        image.Save(ms, ImageFormat.Png);
        return ms.ToArray();
    }
}