c#Base64编码与图片相互转换_c#图片存数据库变成编码怎么转换为图片-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_43254236/article/details/109578004

本文介绍了一种将图片文件转换为Base64编码的方法，并提供了将Base64编码还原为图片的功能。通过C#实现，文章详细展示了如何读取图片并将其编码为Base64字符串，同时提供了解析Base64字符串并保存为图片的具体步骤。

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图片转换成Base64编码

 /// <summary>
        /// 图片转Base64
        /// </summary>
        /// <param name="ImageFileName">图片的完整路径</param>
        /// <returns>返回base64码</returns>
        public static string ImgToBase64(string ImageFileName)
        {
            byte[] arr = { };
            try
            {
                Bitmap bmp = new Bitmap(ImageFileName);

                MemoryStream ms = new MemoryStream();
                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                arr = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(arr, 0, (int)ms.Length);
                ms.Close();

            }
            catch (Exception ex)
            {
             
            }
            return Convert.ToBase64String(arr);
        }

Base64编码转换成图片

 /// <summary>
        /// 解析base-64转换图片
        /// </summary>
        /// <param name="imgs">base64码</param>

        /// <returns>返回图片路径</returns>
        public static string SavePhoto(string imgs)
        {
            string dummyData = imgs.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+").Replace(" +", "%2B");
            if (dummyData.Length % 4 > 0)
            {
                dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
            }

            byte[] arr2 = Convert.FromBase64String(dummyData);


            using (MemoryStream ms2 = new MemoryStream(arr2))
            {

                System.Drawing.Bitmap bmp2 = new System.Drawing.Bitmap(ms2);
                只有把当前的图像复制一份，然后把旧的Dispose掉，那个文件就不被锁住了，
                这样就可以放心覆盖原始文件，否则GDI+一般性错误(A generic error occurred in GDI+)
                //System.Drawing.Bitmap bmpNew = new System.Drawing.Bitmap(bmp2);
                //bmp2.Dispose();
                //bmp2 = null;
                var date = DateTime.Now.ToString("yyyy-MM-dd");


                string[] str = date.Split('-');
                DirectoryInfo dinfo4 = new DirectoryInfo("D:\\图片缓存\\" + str[0] + "\\" + str[1] + "\\" + str[2]);
                if (!dinfo4.Exists)
                {
                    Directory.CreateDirectory("D:\\图片缓存\\" + str[0] + "\\" + str[1] + "\\" + str[2]);
                }

                string filename = date + "-" + DateTime.Now.TimeOfDay.ToString("hhmmss");

                string path = "D:\\图片缓存\\" + str[0] + "\\" + str[1] + "\\" + str[2] + "\\";

                bmp2.Save(string.Format(path + filename + ".jpg", date), System.Drawing.Imaging.ImageFormat.Jpeg);
                //bmp2.Save(filePath + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
                //bmp2.Save(filePath + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp);
                //bmp2.Save(filePath + ".gif", System.Drawing.Imaging.ImageFormat.Gif);
                //bmp2.Save(filePath + ".png", System.Drawing.Imaging.ImageFormat.Png);
                bmp2.Dispose();
                return path + filename + ".jpg";
            }
        }