C#生成动图gif

引用库文件Gif.Components.dll

1、把Gif文件转成Png文件

        /// <summary>
        /// 把Gif文件转成Png文件，放在directory目录下
        /// </summary>
        /// <param name="file"></param>
        /// <param name="directory"></param>
        /// <returns></returns>
        public static void GifToPngs(string giffile, string directory)
        {
            GifDecoder gifDecoder = new GifDecoder();
            directory  = "\\";
            if (!Directory.Exists(directory))
            {
                Directory.CreateDirectory(directory);
            }
            //读取
            gifDecoder.Read(giffile);
            for (int i = 0, count = gifDecoder.GetFrameCount(); i < count; i  )
            {
                Image frame = gifDecoder.GetFrame(i);  // frame i
                frame.Save(directory   "\\"   i.ToString("d2")   ".png", ImageFormat.Png);
                //转成jpg
                //frame.Save(directory   "\\"   i.ToString("d2")   ".jpg", ImageFormat.Jpeg);
            }
        }

2、把多张Png文件转成Gif文件

        /// <summary>
        /// 把directory文件夹里的png文件生成为gif文件，放在giffile
        /// </summary>
        /// <param name="directory">png文件夹</param>
        /// <param name="giffile">gif保存路径</param>
        /// <param name="time">每帧的时间/ms</param>
        /// <param name="repeat">是否重复</param>
        public static void PngsToGif(string directory, string giffile, int time, bool repeat)
        {
            //一般文件名按顺序排
            string[] pngfiles = Directory.GetFileSystemEntries(directory, "*.png");
            
            AnimatedGifEncoder e = new AnimatedGifEncoder();
            e.Start(giffile);

            //每帧播放时间
            e.SetDelay(500);
            
            //-1：不重复，0：重复
            e.SetRepeat(repeat?0:-1);
            for (int i = 0, count = pngfiles.Length; i < count; i  )
            {
                e.AddFrame(Image.FromFile(pngfiles[i]));
            }
            e.Finish();
        }

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