c# Base64转图片并保存

   public byte[] Base64ToImage(string base64, string faceid,int  is_matching)
        { 
            try
            {
                base64 = base64.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "").Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");//将base64头部信息替换
                byte[] bytes = Convert.FromBase64String(base64);
                MemoryStream memStream = new MemoryStream(bytes);
                Image mImage = Image.FromStream(memStream);
                Bitmap bp = new Bitmap(mImage);
                string path = @"C:\uploads";
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                DateTime now = DateTime.Now;
                string fileName = "";
                string jsonText = "";//通讯结果
                //这边注意，如果匹配失败，图片名称前增加标识，目的是在开包台前做判断，如果时匹配失败，则不显示匹配失败图片
                if (is_matching== Constant.FACE_RESULT_TRUE)
                {
                    fileName = string.Format("{0}-{1}-{2}-{3}-{4}-{5}-{6}", now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second, now.Millisecond) + ".jpg";
                                                        }
                else
                {
                    fileName = string.Format("{0}-{1}-{2}-{3}-{4}-{5}-{6}-{7}", Constant.FACE_RESULT_IMAGE_SIGN, now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second, now.Millisecond) + ".jpg";
                                   }
                string filePath = path + "\\" + fileName;
                bp.Save(filePath, System.Drawing.Imaging.ImageFormat.Jpeg);//注意保存路径
               
            }
            catch (Exception ex)
            {
                Logger.Debug($"Return base64转图片失败，错误详情:  {ex.Message}");
                throw;
            }
        }