public ActionResult UploadSignature2(string src_data)

        {

            Class1.Base64StrToImage(src_data, "C:\\Users\\45448\\Desktop\\1\\"+ DateTime.Now.ToString("yyyyMMddHHss") + ".png");

            return Json(, JsonRequestBehavior.AllowGet);

        }

        /// <summary>

        /// 将Base64字符串转换为图片并保存到本地

        /// </summary>

        /// <param name="base64Str">base64字符串</param>

        /// <param name="savePath">图片保存地址，如：/Content/Images/10000.png</param>

        /// <returns></returns>

        public static bool Base64StrToImage(string base64Str, string savePath)

        {

            var ret = true;

            try

            {

                base64Str = base64Str.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

                var bitmap = Base64StrToImage(base64Str);

                if (bitmap != null)

                {

                    //创建文件夹

                    var folderPath = savePath.Substring(, savePath.LastIndexOf('\\'));

                    ////FileHelper.CreateDir(folderPath);

                    if (!Directory.Exists(folderPath))

                    {

                        Directory.CreateDirectory(folderPath);

                    }

                    //图片后缀格式

                    var suffix = savePath.Substring(savePath.LastIndexOf('.') + ,

                        savePath.Length - savePath.LastIndexOf('.') - ).ToLower();

                    var suffixName = suffix == "png"

                        ? ImageFormat.Png

                        : suffix == "jpg" || suffix == "jpeg"

                            ? ImageFormat.Jpeg

                            : suffix == "bmp"

                                ? ImageFormat.Bmp

                                : suffix == "gif"

                                    ? ImageFormat.Gif

                                    : ImageFormat.Jpeg;

                    //这里复制一份对图像进行保存，否则会出现“GDI+ 中发生一般性错误”的错误提示

                    var bmpNew = new Bitmap(bitmap);

                    bmpNew.Save(savePath, suffixName);

                    bmpNew.Dispose();

                    bitmap.Dispose();

                }

                else

                {

                    ret = false;

                }

            }

            catch (Exception ex)

            {

                ret = false;

            }

            return ret;

        }

 /// <summary>

        /// Image 转成 base64

        /// </summary>

        /// <param name="fileFullName"></param>

        public static string ImageToBase64(string fileFullName)

        {

            try

            {

                Bitmap bmp = new Bitmap(fileFullName);

                MemoryStream ms = new MemoryStream();

                var suffix = fileFullName.Substring(fileFullName.LastIndexOf('.') + ,

                    fileFullName.Length - fileFullName.LastIndexOf('.') - ).ToLower();

                var suffixName = suffix == "png"

                    ? ImageFormat.Png

                    : suffix == "jpg" || suffix == "jpeg"

                        ? ImageFormat.Jpeg

                        : suffix == "bmp"

                            ? ImageFormat.Bmp

                            : suffix == "gif"

                                ? ImageFormat.Gif

                                : ImageFormat.Jpeg;

                bmp.Save(ms, suffixName);

                byte[] arr = new byte[ms.Length]; ms.Position = ;

                ms.Read(arr, , (int)ms.Length); ms.Close();

                return Convert.ToBase64String(arr);

            }

            catch (Exception ex)

            {

                return null;

            }

        }