/// <summary>
/// 保存高质量的缩略位图
/// </summary>
/// <param name="source">源图</param>
/// <param name="width">缩略位图高</param>
/// <param name="height">缩略位图宽</param>
/// <example>
/// SourceImg.SaveThumbnailBitmap(8, 8, "C:/", "a", "jpg");
/// </example>
public static void SaveThumbnailBitmap(this Image source, int width, int height, string directory, string filename, string extension)
{
var physicalPath = directory + filename + "." + extension;
using (var newImage = source.GetThumbnailBitmap(width, height))
{
using (var encoderParameters = new EncoderParameters(1))
{
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
newImage.Save(physicalPath,
ImageCodecInfo.GetImageEncoders()
.Where(x => x.FilenameExtension.Contains(extension.ToUpperInvariant()))
.FirstOrDefault(),
encoderParameters);
}
}
}
