• ASP.NET上传图片并自动生成缩略图(另附有生成验证码功能代码)
  • Amour 发表于 2017/3/2 9:28:00 | 分类标签: 上传图片代码 验证码
  •   一个页面加载图片太多的时候就很慢,需要用到缩略图,可以在图片上传的时候生成。Image对象已经包含了压缩图片的方法。

     所以过程很简单:

            [AcceptVerbs(HttpVerbs.Post)]
            public JsonResult Upload(HttpPostedFileBase fileData)
            {
                //.....
                 var extension = Path.GetExtension(fileName);// 文件扩展名
                        if (extension != null)
                        {
                            string image = extension.ToLower();//System.IO.Path.GetExtension获得文件的扩展名
                            if (image == ".bmp" || image == ".png" || image == ".gif" || image == ".jpg")
                            {
                                //压缩。
                                var thumpath = filePath + "samll_" + fileName
                                  GetThumbnail(savepath, thumpath, 150);
                            }
                        }
               //....
             }
    
    
            /// <summary>
            /// 按比例 存放缩略图片
            /// </summary>
            /// <param name="sourceFileName">原始地址</param>
            /// <param name="saveFileName">存放地址</param>
            /// <param name="width">宽度</param>
            public void GetThumbnail(string sourceFileName, string saveFileName, int width)
            {
                 var iSource = Image.FromFile(sourceFileName);
                var height = width*iSource.Height/iSource.Width;
        var samllimg = iSource.GetThumbnailImage(width, height, null, IntPtr.Zero);
                 samllimg.Save(saveFileName);
            }
    

     

     160k 到 35k ,当然还可以更小。MSDN的对方法参数的解释:

     

    且缩略图默认

     区友的方法,可以调节清晰度。相对复杂些。

     public static bool GetPicThumbnail(string sFile, string outPath, int flag)
            {
                System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
                ImageFormat tFormat = iSource.RawFormat;
    
                //以下代码为保存图片时,设置压缩质量  
                EncoderParameters ep = new EncoderParameters();
                long[] qy = new long[1];
                qy[0] = flag;//设置压缩的比例1-100  
                EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
                ep.Param[0] = eParam;
                try
                {
                    ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                    ImageCodecInfo jpegICIinfo = null;
                    for (int x = 0; x < arrayICI.Length; x++)
                    {
                        if (arrayICI[x].FormatDescription.Equals("JPEG"))
                        {
                            jpegICIinfo = arrayICI[x];
                            break;
                        }
                    }
                    if (jpegICIinfo != null)
                    {
                        iSource.Save(outPath, jpegICIinfo, ep);//dFile是压缩后的新路径  
                    }
                    else
                    {
                        iSource.Save(outPath, tFormat);
                    }
                    return true;
                }
                catch
                {
                    return false;
                }
                finally
                {
                    iSource.Dispose();
                    iSource.Dispose();
                }
            }

     最后整理了个ImageManageHelper 类,加上了验证码,图片水印,文字水印,缩略图。

    using System;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Drawing.Imaging;
    using System.Globalization;
    using System.IO;
    using System.Linq;
    
    namespace Protal.Web.Framework.Helper
    {
        public class ImageManageHelper
        {
            /// <summary>   
            /// 添加图片水印   
            /// </summary>   
            /// <param name="sourcePicture">源图片文件名</param>   
            /// <param name="waterImage">水印图片文件名</param>   
            /// <param name="alpha">透明度(0.1-1.0数值越小透明度越高)</param>   
            /// <param name="position">位置</param>   
            /// <param name="picturePath" >图片的路径</param>   
            /// <returns>返回生成于指定文件夹下的水印文件名</returns>   
            public static string DrawImage(string sourcePicture, string waterImage, float alpha, ImagePosition position, string picturePath)
            {
                if (sourcePicture == string.Empty || waterImage == string.Empty || Math.Abs(alpha * 10) - 1 < 0 || picturePath == string.Empty)
                {
                    return sourcePicture;
                }
                var imgPhoto = Image.FromFile(sourcePicture);
                //   
                // 确定其长宽   
                //   
                int phWidth = imgPhoto.Width;
                int phHeight = imgPhoto.Height;
                // 封装 GDI+ 位图,此位图由图形图像及其属性的像素数据组成。   
                var bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
                // 设定分辨率   
                bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                // 定义一个绘图画面用来装载位图   
                var grPhoto = Graphics.FromImage(bmPhoto);
    
                //同样,由于水印是图片,我们也需要定义一个Image来装载它   
                Image imgWatermark = new Bitmap(waterImage);
                int wmWidth = imgWatermark.Width;
                int wmHeight = imgWatermark.Height;
    
                //SmoothingMode:指定是否将平滑处理(消除锯齿)应用于直线、曲线和已填充区域的边缘。   
                // 成员名称   说明    
                // AntiAlias      指定消除锯齿的呈现。     
                // Default        指定不消除锯齿。     
                // HighQuality  指定高质量、低速度呈现。     
                // HighSpeed   指定高速度、低质量呈现。     
                // Invalid        指定一个无效模式。     
                // None          指定不消除锯齿。    
                grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
                // 第一次描绘,将我们的底图描绘在绘图画面上   
                grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, phWidth, phHeight), 0, 0, phWidth, phHeight, GraphicsUnit.Pixel);
    
                var bmWatermark = new Bitmap(bmPhoto);
                bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                //   
                // 继续,将水印图片装载到一个绘图画面grWatermark   
                //   
                Graphics grWatermark = Graphics.FromImage(bmWatermark);
    
                //   
                //ImageAttributes 对象包含有关在呈现时如何操作位图和图元文件颜色的信息。   
                //          
                var imageAttributes = new ImageAttributes();
    
                //   
                //Colormap: 定义转换颜色的映射   
                //   
                var colorMap = new ColorMap
                {
                    OldColor = Color.FromArgb(255, 0, 255, 0),
                    NewColor = Color.FromArgb(0, 0, 0, 0)
                };
    
                //   
                //我的水印图被定义成拥有绿色背景色的图片被替换成透明   
    
                ColorMap[] remapTable = { colorMap };
    
                imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
    
                float[][] colorMatrixElements = {    
               new[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f}, // red红色   
               new[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f}, //green绿色   
               new[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f}, //blue蓝色          
               new[] {0.0f,  0.0f,  0.0f,  alpha, 0.0f}, //透明度        
               new[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};//   
    
                //  ColorMatrix:定义包含 RGBA 空间坐标的 5 x 5 矩阵。   
                //  ImageAttributes 类的若干方法通过使用颜色矩阵调整图像颜色。   
                var wmColorMatrix = new ColorMatrix(colorMatrixElements);
                imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
                 ColorAdjustType.Bitmap);
                //   
                //上面设置完颜色,下面开始设置位置   
                //   
                int xPosOfWm;
                int yPosOfWm;
                switch (position)
                {
                    case ImagePosition.BottomMiddle:
                        xPosOfWm = (phWidth - wmWidth) / 2;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.Center:
                        xPosOfWm = (phWidth - wmWidth) / 2;
                        yPosOfWm = (phHeight - wmHeight) / 2;
                        break;
                    case ImagePosition.LeftBottom:
                        xPosOfWm = 10;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.LeftTop:
                        xPosOfWm = 10;
                        yPosOfWm = 10;
                        break;
                    case ImagePosition.RightTop:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = 10;
                        break;
                    case ImagePosition.RigthBottom:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.TopMiddle:
                        xPosOfWm = (phWidth - wmWidth) / 2;
                        yPosOfWm = 10;
                        break;
                    default:
                        xPosOfWm = 10;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                }
                grWatermark.DrawImage(imgWatermark, new Rectangle(xPosOfWm, yPosOfWm, wmWidth, wmHeight), 0, 0, wmWidth, wmHeight, GraphicsUnit.Pixel, imageAttributes);
                imgPhoto = bmWatermark;
                grPhoto.Dispose();
                grWatermark.Dispose();
    
                // 保存文件到服务器的文件夹里面   
                imgPhoto.Save(picturePath, ImageFormat.Jpeg);
                imgPhoto.Dispose();
                imgWatermark.Dispose();
                return picturePath;
            }
    
            /// <summary>
            /// 存放缩略图
            /// </summary>
            /// <param name="sourceFileName"></param>
            /// <param name="saveFileName"></param>
            /// <param name="width"></param>
            /// <param name="height"></param>
            public static void GetThumbnail(string sourceFileName, string saveFileName, int width, int height)
            {
                var iSource = Image.FromFile(sourceFileName);
                var samllimg = iSource.GetThumbnailImage(width, height, null, IntPtr.Zero);
                samllimg.Save(saveFileName);
            }
    
            /// <summary>
            /// 按比例 存放缩略图片
            /// </summary>
            /// <param name="sourceFileName"></param>
            /// <param name="saveFileName"></param>
            /// <param name="width"></param>
            public static void GetThumbnail(string sourceFileName, string saveFileName, int width)
            {
                var iSource = Image.FromFile(sourceFileName);
                var height = width * iSource.Height / iSource.Width;
                var samllimg = iSource.GetThumbnailImage(width, height, null, IntPtr.Zero);
                samllimg.Save(saveFileName);
            }
    
            /// <summary>
            /// 无损压缩图片
            /// </summary>
            /// <param name="sFile">原图片</param>
            /// <param name="dFile">压缩后保存位置</param>
            /// <param name="dHeight">高度</param>
            /// <param name="dWidth"></param>
            /// <param name="flag">压缩质量 1-100</param>
            /// <returns></returns>
            public static bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth, int flag)
            {
                var iSource = Image.FromFile(sFile);
                var tFormat = iSource.RawFormat;
                int sW, sH;
                //按比例缩放
                var temSize = new Size(iSource.Width, iSource.Height);
    
                if (temSize.Width > dHeight || temSize.Width > dWidth) //将**改成c#中的或者操作符号
                {
                    if ((temSize.Width * dHeight) > (temSize.Height * dWidth))
                    {
                        sW = dWidth;
                        sH = (dWidth * temSize.Height) / temSize.Width;
                    }
                    else
                    {
                        sH = dHeight;
                        sW = (temSize.Width * dHeight) / temSize.Height;
                    }
                }
    
                else
                {
                    sW = temSize.Width;
                    sH = temSize.Height;
                }
                var ob = new Bitmap(dWidth, dHeight);
                var g = Graphics.FromImage(ob);
                g.Clear(Color.WhiteSmoke);
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
                g.Dispose();
                //以下代码为保存图片时,设置压缩质量
                var ep = new EncoderParameters();
                var qy = new long[1];
                qy[0] = flag;//设置压缩的比例1-100
                var eParam = new EncoderParameter(Encoder.Quality, qy);
                ep.Param[0] = eParam;
                try
                {
                    var arrayICI = ImageCodecInfo.GetImageEncoders();
                    var jpegICIinfo = arrayICI.FirstOrDefault(t => t.FormatDescription.Equals("JPEG"));
                    if (jpegICIinfo != null)
                    {
                        ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径
                    }
                    else
                    {
                        ob.Save(dFile, tFormat);
                    }
                    return true;
                }
    
                catch
                {
                    return false;
                }
    
                finally
                {
                    iSource.Dispose();
                    ob.Dispose();
                }
            }
    
            /// <summary>   
            /// 在图片上添加水印文字   
            /// </summary>   
            /// <param name="sourcePicture">源图片文件</param>   
            /// <param name="waterWords">需要添加到图片上的文字</param>   
            /// <param name="alpha">透明度</param>   
            /// <param name="position">位置</param>   
            /// <param name="picturePath">文件路径</param>   
            /// <returns></returns>   
            public static string DrawWords(string sourcePicture, string waterWords, float alpha, ImagePosition position, string picturePath)
            {
                // 判断参数是否有效   
                if (sourcePicture == string.Empty || waterWords == string.Empty || Math.Abs(alpha * 10) - 1 < 0 || picturePath == string.Empty)
                {
                    return sourcePicture;
                }
                //创建一个图片对象用来装载要被添加水印的图片   
                Image imgPhoto = Image.FromFile(sourcePicture);
    
                //获取图片的宽和高   
                int phWidth = imgPhoto.Width;
                int phHeight = imgPhoto.Height;
    
                //   
                //建立一个bitmap,和我们需要加水印的图片一样大小   
                var bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
    
                //SetResolution:设置此 Bitmap 的分辨率   
                //这里直接将我们需要添加水印的图片的分辨率赋给了bitmap   
                bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    
                //Graphics:封装一个 GDI+ 绘图图面。   
                Graphics grPhoto = Graphics.FromImage(bmPhoto);
    
                //设置图形的品质   
                grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
    
                //将我们要添加水印的图片按照原始大小描绘(复制)到图形中   
                grPhoto.DrawImage(
                 imgPhoto,                                           //   要添加水印的图片   
                 new Rectangle(0, 0, phWidth, phHeight), //  根据要添加的水印图片的宽和高   
                 0,                                                     //  X方向从0点开始描绘   
                 0,                                                     // Y方向    
                 phWidth,                                            //  X方向描绘长度   
                 phHeight,                                           //  Y方向描绘长度   
                 GraphicsUnit.Pixel);                              // 描绘的单位,这里用的是像素   
    
                //根据图片的大小我们来确定添加上去的文字的大小   
                //在这里我们定义一个数组来确定   
                var sizes = new[] { 16, 14, 12, 10, 8, 6, 4 };
    
                //字体   
                Font crFont = null;
                //矩形的宽度和高度,SizeF有三个属性,分别为Height高,width宽,IsEmpty是否为空   
                var crSize = new SizeF();
    
                //利用一个循环语句来选择我们要添加文字的型号   
                //直到它的长度比图片的宽度小   
                for (int i = 0; i < 7; i++)
                {
                    crFont = new Font("arial", sizes[i], FontStyle.Bold);
    
                    //测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。   
                    crSize = grPhoto.MeasureString(waterWords, crFont);
    
                    // ushort 关键字表示一种整数数据类型   
                    if ((ushort)crSize.Width < (ushort)phWidth)
                        break;
                }
    
                //截边5%的距离,定义文字显示(由于不同的图片显示的高和宽不同,所以按百分比截取)   
    
                //定义在图片上文字的位置   
                float wmHeight = crSize.Height;
                float wmWidth = crSize.Width;
    
                float xPosOfWm;
                float yPosOfWm;
    
                switch (position)
                {
                    case ImagePosition.BottomMiddle:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.Center:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = phHeight / 2;
                        break;
                    case ImagePosition.LeftBottom:
                        xPosOfWm = wmWidth;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.LeftTop:
                        xPosOfWm = wmWidth / 2;
                        yPosOfWm = wmHeight / 2;
                        break;
                    case ImagePosition.RightTop:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = wmHeight;
                        break;
                    case ImagePosition.RigthBottom:
                        xPosOfWm = phWidth - wmWidth - 10;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                    case ImagePosition.TopMiddle:
                        xPosOfWm = phWidth / 2;
                        yPosOfWm = wmWidth;
                        break;
                    default:
                        xPosOfWm = wmWidth;
                        yPosOfWm = phHeight - wmHeight - 10;
                        break;
                }
    
                //封装文本布局信息(如对齐、文字方向和 Tab 停靠位),显示操作(如省略号插入和国家标准 (National) 数字替换)和 OpenType 功能。   
                var strFormat = new StringFormat {Alignment = StringAlignment.Center};
    
                //定义需要印的文字居中对齐   
    
                //SolidBrush:定义单色画笔。画笔用于填充图形形状,如矩形、椭圆、扇形、多边形和封闭路径。   
                //这个画笔为描绘阴影的画笔,呈灰色   
                var mAlpha = Convert.ToInt32(256 * alpha);
                var semiTransBrush2 = new SolidBrush(Color.FromArgb(mAlpha, 0, 0, 0));
    
                //描绘文字信息,这个图层向右和向下偏移一个像素,表示阴影效果   
                //DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。   
                grPhoto.DrawString(waterWords,                                    //string of text   
                                           crFont,                                         //font   
                                           semiTransBrush2,                            //Brush   
                                           new PointF(xPosOfWm + 1, yPosOfWm + 1),  //Position   
                                           strFormat);
    
                //从四个 ARGB 分量(alpha、红色、绿色和蓝色)值创建 Color 结构,这里设置透明度为153   
                //这个画笔为描绘正式文字的笔刷,呈白色   
                var semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
    
                //第二次绘制这个图形,建立在第一次描绘的基础上   
                grPhoto.DrawString(waterWords,                 //string of text   
                                           crFont,                                   //font   
                                           semiTransBrush,                           //Brush   
                                           new PointF(xPosOfWm, yPosOfWm),  //Position   
                                           strFormat);
    
                //imgPhoto是我们建立的用来装载最终图形的Image对象   
                //bmPhoto是我们用来制作图形的容器,为Bitmap对象   
                imgPhoto = bmPhoto;
                //释放资源,将定义的Graphics实例grPhoto释放,grPhoto功德圆满   
                grPhoto.Dispose();
    
                //将grPhoto保存   
                imgPhoto.Save(picturePath, ImageFormat.Jpeg);
                imgPhoto.Dispose();
    
                return picturePath;
            }
    
            ///<summary>
            /// 生成验证码
            ///</summary>
            ///<param name="length">指定验证码的长度</param>
            ///<returns></returns>
            public static string CreateValidateCode(int length)
            {
    
                var randMembers = new int[length];
                var validateNums = new int[length];
                var validateNumberStr = "";
    
                //生成起始序列值
    
                var seekSeek = unchecked((int)DateTime.Now.Ticks);
                var seekRand = new Random(seekSeek);
                var beginSeek = seekRand.Next(0, Int32.MaxValue - length * 10000);
                var seeks = new int[length];
                for (var i = 0; i < length; i++)
                {
                    beginSeek += 10000;
                    seeks[i] = beginSeek;
                }
    
                //生成随机数字
                for (int i = 0; i < length; i++)
                {
                    var rand = new Random(seeks[i]);
                    var pownum = 1 * (int)Math.Pow(10, length);
                    randMembers[i] = rand.Next(pownum, Int32.MaxValue);
                }
    
                //抽取随机数字
                for (int i = 0; i < length; i++)
                {
                    var numStr = randMembers[i].ToString(CultureInfo.InvariantCulture);
                    var numLength = numStr.Length;
                    var rand = new Random();
                    var numPosition = rand.Next(0, numLength - 1);
                    validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
                }
    
                //生成验证码
                for (var i = 0; i < length; i++)
                {
                    validateNumberStr += validateNums[i].ToString(CultureInfo.InvariantCulture);
                }
                return validateNumberStr;
            }
    
            /// <summary>
            ///  创建验证码的图片
            /// </summary>
            /// <param name="validateCode"></param>
            public static byte[] CreateValidateGraphic(string validateCode)
            {
                var image = new Bitmap((int)Math.Ceiling(validateCode.Length * 14.0), 22);
                var g = Graphics.FromImage(image);
                try
                {
                    //生成随机生成器
                    var random = new Random();
                    //清空图片背景色
                    g.Clear(Color.White);
                    //画图片的干扰线
                    for (var i = 0; i < 25; i++)
                    {
                        int x1 = random.Next(image.Width);
                        int x2 = random.Next(image.Width);
                        int y1 = random.Next(image.Height);
                        int y2 = random.Next(image.Height);
                        g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                    }
                    var font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
                    var brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
                                                                        Color.Blue, Color.DarkRed, 1.5f, true);
                    g.DrawString(validateCode, font, brush, 3, 2);
                    //画图片的前景干扰点
                    for (int i = 0; i < 100; i++)
                    {
                        int x = random.Next(image.Width);
                        int y = random.Next(image.Height);
                        image.SetPixel(x, y, Color.FromArgb(random.Next()));
                    }
    
                    //画图片的边框线
                    g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
                    //保存图片数据
                    var stream = new MemoryStream();
                    image.Save(stream, ImageFormat.Jpeg);
                    //输出图片流
                    return stream.ToArray();
                }
    
                finally
                {
                    g.Dispose();
                    image.Dispose();
                }
    
            }
        }
    
        public enum ImagePosition
        {
            LeftTop,        //左上   
            LeftBottom,    //左下   
            RightTop,       //右上   
            RigthBottom,  //右下   
            TopMiddle,     //顶部居中   
            BottomMiddle, //底部居中   
            Center           //中心   
        }
    
    }

    调用:

    //.....
    var thumpath = filePath + "samll_" + fileName; var watermarkpath = filePath + "water_" + fileName; var waterimgpath = @"D:\VS2012\Support\Main\Protal\Protal.Web\Content\UploadFiles\samll_20131226155621981.JPG"; ImageManageHelper.GetThumbnail(savepath, thumpath, 150);//缩略图 这里的path都是带文件名的路径 ImageManageHelper.DrawWords(savepath, "Stoneniqiu", 0.8, ImagePosition.BottomMiddle, watermarkpath);//文字水印 ImageManageHelper.DrawImage(savepath, waterimgpath, 0.8, ImagePosition.BottomMiddle,watermarkpath);//图片水印 //.....

    ///验证码
    public ActionResult GetValidateCode() { var code = ImageManageHelper.CreateValidateCode(4); if (code == "") return null; var bytes = ImageManageHelper.CreateValidateGraphic(code); return File(bytes, @"image/jpeg"); }
     <img id="valiCode" style="cursor: pointer;vertical-align: bottom" src="@Url.Action("GetValidateCode")" alt="看不清?请点我" />

     

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