你的位置:首页 > ASP.net教程

[ASP.net教程]ASP.NET 图片上传工具类 upload image简单好用功能齐全


使用方法:

 UploadImage ui = new UploadImage();      /***可选参数***/      ui.SetWordWater = "哈哈";//文字水印      // ui.SetPicWater = Server.MapPath("2.png");//图片水印(图片和文字都赋值图片有效)      ui.SetPositionWater = 4;//水印图片的位置 0居中、1左上角、2右上角、3左下角、4右下角      ui.SetSmallImgHeight = "110,40,20";//设置缩略图可以多个      ui.SetSmallImgWidth = "100,40,20";      //保存图片生成缩略图      var reponseMessage = ui.FileSaveAs(Request.Files[0], Server.MapPath("~/file/temp"));      //裁剪图片      var reponseMessage2 = ui.FileCutSaveAs(Request.Files[0], Server.MapPath("~/file/temp2"), 400, 300, UploadImage.CutMode.CutNo);      /***返回信息***/      var isError = reponseMessage.IsError;//是否异常      var webPath = reponseMessage.WebPath;//web路径      var filePath = reponseMessage.filePath;//物理路径      var message = reponseMessage.Message;//错误信息      var directory = reponseMessage.Directory;//目录      var smallPath1 = reponseMessage.SmallPath(0);//缩略图路径1      var smallPath2 = reponseMessage.SmallPath(1);//缩略图路径2      var smallPath3 = reponseMessage.SmallPath(2);//缩略图路径3

  

 

 效果:

 

源码:

 

using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Web;using System.Drawing;using System.Drawing.Imaging;using System.Drawing.Drawing2D;using System.Collections;using System.Net;using System.Text.RegularExpressions;using System.Configuration;namespace SyntacticSugar{  /// <summary>  /// ** 描述:图片上传类、支持水印、缩略图  /// ** 创始时间:2015-5-28  /// ** 修改时间:-  /// ** 修改人:sunkaixuan  /// ** 使用说明:http://www.cnblogs.com/sunkaixuan/p/4536626.html  /// </summary>  public class UploadImage  {    #region 属性    /// <summary>    /// 允许图片格式    /// </summary>    public string SetAllowFormat { get; set; }    /// <summary>    /// 允许上传图片大小    /// </summary>    public double SetAllowSize { get; set; }    /// <summary>    /// 文字水印字符    /// </summary>    public string SetWordWater { get; set; }    /// <summary>    /// 图片水印    /// </summary>    public string SetPicWater { get; set; }    /// <summary>    /// 水印图片的位置 0居中、1左上角、2右上角、3左下角、4右下角    /// </summary>    public int SetPositionWater { get; set; }    /// <summary>    /// 缩略图宽度多个逗号格开(例如:200,100)    /// </summary>    public string SetSmallImgWidth { get; set; }    /// <summary>    /// 缩略图高度多个逗号格开(例如:200,100)    /// </summary>    public string SetSmallImgHeight { get; set; }    /// <summary>    /// 是否限制最大宽度,默认为true    /// </summary>    public bool SetLimitWidth { get; set; }    /// <summary>    /// 最大宽度尺寸,默认为600    /// </summary>    public int SetMaxWidth { get; set; }    /// <summary>    /// 是否剪裁图片,默认true    /// </summary>    public bool SetCutImage { get; set; }    /// <summary>    /// 限制图片最小宽度,0表示不限制    /// </summary>    public int SetMinWidth { get; set; }    #endregion    public UploadImage()    {      SetAllowFormat = ".jpeg|.jpg|.bmp|.gif|.png";  //允许图片格式      SetAllowSize = 1;    //允许上传图片大小,默认为1MB      SetPositionWater = 4;      SetCutImage = true;    }    #region main method    /// <summary>    /// 裁剪图片    /// </summary>    /// <param name="PostedFile">HttpPostedFile控件</param>    /// <param name="SavePath">保存路径【sys.config配置路径】</param>    /// <param name="oImgWidth">图片宽度</param>    /// <param name="oImgHeight">图片高度</param>    /// <param name="cMode">剪切类型</param>    /// <param name="ext">返回格式</param>    /// <returns>返回上传信息</returns>    public ResponseMessage FileCutSaveAs(System.Web.HttpPostedFile PostedFile, string SavePath, int oImgWidth, int oImgHeight, CutMode cMode)    {      ResponseMessage rm = new ResponseMessage();      try      {        //获取上传文件的扩展名        string sEx = System.IO.Path.GetExtension(PostedFile.FileName);        if (!CheckValidExt(SetAllowFormat, sEx))        {          TryError(rm, 2);          return rm;        }        //获取上传文件的大小        double PostFileSize = PostedFile.ContentLength / 1024.0 / 1024.0;        if (PostFileSize > SetAllowSize)        {          TryError(rm, 3);          return rm; //超过文件上传大小        }        if (!System.IO.Directory.Exists(SavePath))        {          System.IO.Directory.CreateDirectory(SavePath);        }        //重命名名称        string NewfileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString("000");        string fName = "s" + NewfileName + sEx;        string fullPath = Path.Combine(SavePath, fName);        PostedFile.SaveAs(fullPath);        //重命名名称        string sNewfileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString("000");        string sFName = sNewfileName + sEx;        rm.IsError = false;        rm.FileName = sFName;        string sFullPath = Path.Combine(SavePath, sFName);        rm.filePath = sFullPath;        rm.WebPath = "/"+sFullPath.Replace(HttpContext.Current.Server.MapPath("~/"), "").Replace("\\", "/");        CreateSmallPhoto(fullPath, oImgWidth, oImgHeight, sFullPath, SetPicWater, SetWordWater, cMode);        if (File.Exists(fullPath))        {          File.Delete(fullPath);        }        //压缩        if (PostFileSize > 100)        {          CompressPhoto(sFullPath, 100);        }      }      catch (Exception ex)      {        TryError(rm, ex.Message);      }      return rm;    }    /// <summary>    /// 通用图片上传类    /// </summary>    /// <param name="PostedFile">HttpPostedFile控件</param>    /// <param name="SavePath">保存路径【sys.config配置路径】</param>    /// <param name="finame">返回文件名</param>    /// <param name="fisize">返回文件大小</param>    /// <returns>返回上传信息</returns>    public ResponseMessage FileSaveAs(System.Web.HttpPostedFile PostedFile, string SavePath)    {      ResponseMessage rm = new ResponseMessage();      try      {        if (string.IsNullOrEmpty(PostedFile.FileName))        {          TryError(rm, 4);          return rm;        }        Random rd = new Random();        int rdInt = rd.Next(1000, 9999);        //重命名名称        string NewfileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + rdInt;        //获取上传文件的扩展名        string sEx = System.IO.Path.GetExtension(PostedFile.FileName);        if (!CheckValidExt(SetAllowFormat, sEx))        {          TryError(rm, 2);          return rm;        }        //获取上传文件的大小        double PostFileSize = PostedFile.ContentLength / 1024.0 / 1024.0;        if (PostFileSize > SetAllowSize)        {          TryError(rm, 3);          return rm;        }        if (!System.IO.Directory.Exists(SavePath))        {          System.IO.Directory.CreateDirectory(SavePath);        }        rm.FileName = NewfileName + sEx;        string fullPath = SavePath.Trim('\\') + "\\" + rm.FileName;        rm.WebPath = "/"+fullPath.Replace(HttpContext.Current.Server.MapPath("~/"), "").Replace("\\", "/");        rm.filePath = fullPath;        rm.Size = PostFileSize;        PostedFile.SaveAs(fullPath);        System.Drawing.Bitmap bmp = new Bitmap(fullPath);        int realWidth = bmp.Width;        int realHeight = bmp.Height;        bmp.Dispose();        #region 检测图片宽度限制        if (SetMinWidth > 0)        {          if (realWidth < SetMinWidth)          {            TryError(rm, 7);            return rm;          }        }        #endregion        #region 监测图片宽度是否超过600,超过的话,自动压缩到600        if (SetLimitWidth && realWidth > SetMaxWidth)        {          int mWidth = SetMaxWidth;          int mHeight = mWidth * realHeight / realWidth;          string tempFile = SavePath + Guid.NewGuid().ToString() + sEx;          File.Move(fullPath, tempFile);          CreateSmallPhoto(tempFile, mWidth, mHeight, fullPath, "", "");          File.Delete(tempFile);        }        #endregion        #region 压缩图片存储尺寸        if (sEx.ToLower() != ".gif")        {          CompressPhoto(fullPath, 100);        }        #endregion        //生成缩略图片高宽        if (string.IsNullOrEmpty(SetSmallImgWidth))        {          rm.Message = "上传成功,无缩略图";          return rm;        }        string[] oWidthArray = SetSmallImgWidth.Split(',');        string[] oHeightArray = SetSmallImgHeight.Split(',');        if (oWidthArray.Length != oHeightArray.Length)        {          TryError(rm, 6);          return rm;        }        for (int i = 0; i < oWidthArray.Length; i++)        {          if (Convert.ToInt32(oWidthArray[i]) <= 0 || Convert.ToInt32(oHeightArray[i]) <= 0)            continue;          string sImg = SavePath.TrimEnd('\\') + '\\' + NewfileName + "_" + i.ToString() + sEx;          //判断图片高宽是否大于生成高宽。否则用原图          if (realWidth > Convert.ToInt32(oWidthArray[i]))          {            if (SetCutImage)              CreateSmallPhoto(fullPath, Convert.ToInt32(oWidthArray[i]), Convert.ToInt32(oHeightArray[i]), sImg, "", "");            else              CreateSmallPhoto(fullPath, Convert.ToInt32(oWidthArray[i]), Convert.ToInt32(oHeightArray[i]), sImg, "", "", CutMode.CutNo);          }          else          {            if (SetCutImage)              CreateSmallPhoto(fullPath, realWidth, realHeight, sImg, "", "");            else              CreateSmallPhoto(fullPath, realWidth, realHeight, sImg, "", "", CutMode.CutNo);          }        }        #region 给大图添加水印        if (!string.IsNullOrEmpty(SetPicWater))          AttachPng(SetPicWater, fullPath);        else if (!string.IsNullOrEmpty(SetWordWater))          AttachText(SetWordWater, fullPath);        #endregion      }      catch (Exception ex)      {        TryError(rm, ex.Message);      }      return rm;    }    #region 验证格式    /// <summary>    /// 验证格式    /// </summary>    /// <param name="allType">所有格式</param>    /// <param name="chkType">被检查的格式</param>    /// <returns>bool</returns>    public bool CheckValidExt(string allType, string chkType)    {      bool flag = false;      string[] sArray = allType.Split('|');      foreach (string temp in sArray)      {        if (temp.ToLower() == chkType.ToLower())        {          flag = true;          break;        }      }      return flag;    }    #endregion    #region 根据需要的图片尺寸,按比例剪裁原始图片    /// <summary>    /// 根据需要的图片尺寸,按比例剪裁原始图片    /// </summary>    /// <param name="nWidth">缩略图宽度</param>    /// <param name="nHeight">缩略图高度</param>    /// <param name="img">原始图片</param>    /// <returns>剪裁区域尺寸</returns>    public Size CutRegion(int nWidth, int nHeight, Image img)    {      double width = 0.0;      double height = 0.0;      double nw = (double)nWidth;      double nh = (double)nHeight;      double pw = (double)img.Width;      double ph = (double)img.Height;      if (nw / nh > pw / ph)      {        width = pw;        height = pw * nh / nw;      }      else if (nw / nh < pw / ph)      {        width = ph * nw / nh;        height = ph;      }      else      {        width = pw;        height = ph;      }      return new Size(Convert.ToInt32(width), Convert.ToInt32(height));    }    #endregion    #region 等比例缩小图片    public Size NewSize(int nWidth, int nHeight, Image img)    {      double w = 0.0;      double h = 0.0;      double sw = Convert.ToDouble(img.Width);      double sh = Convert.ToDouble(img.Height);      double mw = Convert.ToDouble(nWidth);      double mh = Convert.ToDouble(nHeight);      if (sw < mw && sh < mh)      {        w = sw;        h = sh;      }      else if ((sw / sh) > (mw / mh))      {        w = nWidth;        h = (w * sh) / sw;      }      else      {        h = nHeight;        w = (h * sw) / sh;      }      return new Size(Convert.ToInt32(w), Convert.ToInt32(h));    }    #endregion    #region 生成缩略图    #region 生成缩略图,不加水印    /// <summary>    /// 生成缩略图,不加水印    /// </summary>    /// <param name="filename">源文件</param>    /// <param name="nWidth">缩略图宽度</param>    /// <param name="nHeight">缩略图高度</param>    /// <param name="destfile">缩略图保存位置</param>    public void CreateSmallPhoto(string filename, int nWidth, int nHeight, string destfile)    {      Image img = Image.FromFile(filename);      ImageFormat thisFormat = img.RawFormat;      Size CutSize = CutRegion(nWidth, nHeight, img);      Bitmap outBmp = new Bitmap(nWidth, nHeight);      Graphics g = Graphics.FromImage(outBmp);      // 设置画布的描绘质量      g.CompositingQuality = CompositingQuality.HighQuality;      g.SmoothingMode = SmoothingMode.HighQuality;      g.InterpolationMode = InterpolationMode.HighQualityBicubic;      int nStartX = (img.Width - CutSize.Width) / 2;      int nStartY = (img.Height - CutSize.Height) / 2;      g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),        nStartX, nStartY, CutSize.Width, CutSize.Height, GraphicsUnit.Pixel);      g.Dispose();      //if (thisFormat.Equals(ImageFormat.Gif))      //{      //  Response.ContentType = "image/gif";      //}      //else      //{      //  Response.ContentType = "image/jpeg";      //}      // 以下代码为保存图片时,设置压缩质量      EncoderParameters encoderParams = new EncoderParameters();      long[] quality = new long[1];      quality[0] = 100;      EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);      encoderParams.Param[0] = encoderParam;      //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。      ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();      ImageCodecInfo jpegICI = null;      for (int x = 0; x < arrayICI.Length; x++)      {        if (arrayICI[x].FormatDescription.Equals("JPEG"))        {          jpegICI = arrayICI[x];//设置JPEG编码          break;        }      }      if (jpegICI != null)      {        //outBmp.Save(Response.OutputStream, jpegICI, encoderParams);        outBmp.Save(destfile, jpegICI, encoderParams);      }      else      {        //outBmp.Save(Response.OutputStream, thisFormat);        outBmp.Save(destfile, thisFormat);      }      img.Dispose();      outBmp.Dispose();    }    #endregion    #region 生成缩略图,加水印    public void CreateSmallPhoto(string filename, int nWidth, int nHeight, string destfile, string sy, int nType)    {      if (nType == 0)        CreateSmallPhoto(filename, nWidth, nHeight, destfile, sy, "");      else        CreateSmallPhoto(filename, nWidth, nHeight, destfile, "", sy);    }    #endregion    #region 生成缩略图    /// <summary>    /// 生成缩略图    /// </summary>    /// <param name="filename">源文件</param>    /// <param name="nWidth">缩略图宽度</param>    /// <param name="nHeight">缩略图高度</param>    /// <param name="destfile">缩略图保存位置</param>    /// <param name="png">图片水印</param>    /// <param name="text">文本水印</param>    public void CreateSmallPhoto(string filename, int nWidth, int nHeight, string destfile, string png, string text)    {      Image img = Image.FromFile(filename);      ImageFormat thisFormat = img.RawFormat;      Size CutSize = CutRegion(nWidth, nHeight, img);      Bitmap outBmp = new Bitmap(nWidth, nHeight);      Graphics g = Graphics.FromImage(outBmp);      g.Clear(Color.White);      // 设置画布的描绘质量      g.CompositingQuality = CompositingQuality.HighQuality;      g.SmoothingMode = SmoothingMode.HighQuality;      g.InterpolationMode = InterpolationMode.HighQualityBicubic;      int nStartX = (img.Width - CutSize.Width) / 2;      int nStartY = (img.Height - CutSize.Height) / 2;      g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),        nStartX, nStartY, CutSize.Width, CutSize.Height, GraphicsUnit.Pixel);      g.Dispose();      // 以下代码为保存图片时,设置压缩质量      EncoderParameters encoderParams = new EncoderParameters();      long[] quality = new long[1];      quality[0] = 100;      EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);      encoderParams.Param[0] = encoderParam;      //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。      ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();      ImageCodecInfo jpegICI = null;      for (int x = 0; x < arrayICI.Length; x++)      {        if (arrayICI[x].FormatDescription.Equals("JPEG"))        {          jpegICI = arrayICI[x];//设置JPEG编码          break;        }      }      if (jpegICI != null)      {        outBmp.Save(destfile, jpegICI, encoderParams);      }      else      {        outBmp.Save(destfile, thisFormat);      }      img.Dispose();      outBmp.Dispose();      if (!string.IsNullOrEmpty(png))        AttachPng(png, destfile);      if (!string.IsNullOrEmpty(text))        AttachText(text, destfile);    }    public void CreateSmallPhoto(string filename, int nWidth, int nHeight, string destfile, string png, string text, CutMode cMode)    {      Image img = Image.FromFile(filename);      if (nWidth <= 0)        nWidth = img.Width;      if (nHeight <= 0)        nHeight = img.Height;      int towidth = nWidth;      int toheight = nHeight;      switch (cMode)      {        case CutMode.CutWH://指定高宽缩放(可能变形)                  break;        case CutMode.CutW://指定宽,高按比例                    toheight = img.Height * nWidth / img.Width;          break;        case CutMode.CutH://指定高,宽按比例          towidth = img.Width * nHeight / img.Height;          break;        case CutMode.CutNo: //缩放不剪裁          int maxSize = (nWidth >= nHeight ? nWidth : nHeight);          if (img.Width >= img.Height)          {            towidth = maxSize;            toheight = img.Height * maxSize / img.Width;          }          else          {            toheight = maxSize;            towidth = img.Width * maxSize / img.Height;          }          break;        default:          break;      }      nWidth = towidth;      nHeight = toheight;      ImageFormat thisFormat = img.RawFormat;      Size CutSize = new Size(nWidth, nHeight);      if (cMode != CutMode.CutNo)        CutSize = CutRegion(nWidth, nHeight, img);      Bitmap outBmp = new Bitmap(CutSize.Width, CutSize.Height);      Graphics g = Graphics.FromImage(outBmp);      g.Clear(Color.White);      // 设置画布的描绘质量      g.CompositingQuality = CompositingQuality.HighQuality;      g.SmoothingMode = SmoothingMode.HighQuality;      g.InterpolationMode = InterpolationMode.HighQualityBicubic;      int nStartX = (img.Width - CutSize.Width) / 2;      int nStartY = (img.Height - CutSize.Height) / 2;      //int x1 = (outBmp.Width - nWidth) / 2;      //int y1 = (outBmp.Height - nHeight) / 2;      if (cMode != CutMode.CutNo)        g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),          nStartX, nStartY, CutSize.Width, CutSize.Height, GraphicsUnit.Pixel);      else        g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),        0, 0, img.Width, img.Height, GraphicsUnit.Pixel);      g.Dispose();      // 以下代码为保存图片时,设置压缩质量      EncoderParameters encoderParams = new EncoderParameters();      long[] quality = new long[1];      quality[0] = 100;      EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);      encoderParams.Param[0] = encoderParam;      //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。      ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();      ImageCodecInfo jpegICI = null;      for (int x = 0; x < arrayICI.Length; x++)      {        if (arrayICI[x].FormatDescription.Equals("JPEG"))        {          jpegICI = arrayICI[x];//设置JPEG编码          break;        }      }      if (jpegICI != null)      {        outBmp.Save(destfile, jpegICI, encoderParams);      }      else      {        outBmp.Save(destfile, thisFormat);      }      img.Dispose();      outBmp.Dispose();      if (!string.IsNullOrEmpty(png))        AttachPng(png, destfile);      if (!string.IsNullOrEmpty(text))        AttachText(text, destfile);    }    #endregion    #endregion    #region 添加文字水印    public void AttachText(string text, string file)    {      if (string.IsNullOrEmpty(text))        return;      if (!System.IO.File.Exists(file))        return;      System.IO.FileInfo oFile = new System.IO.FileInfo(file);      string strTempFile = System.IO.Path.Combine(oFile.DirectoryName, Guid.NewGuid().ToString() + oFile.Extension);      oFile.CopyTo(strTempFile);      Image img = Image.FromFile(strTempFile);      ImageFormat thisFormat = img.RawFormat;      int nHeight = img.Height;      int nWidth = img.Width;      Bitmap outBmp = new Bitmap(nWidth, nHeight);      Graphics g = Graphics.FromImage(outBmp);      g.Clear(Color.White);      // 设置画布的描绘质量      g.CompositingQuality = CompositingQuality.HighQuality;      g.SmoothingMode = SmoothingMode.HighQuality;      g.InterpolationMode = InterpolationMode.HighQualityBicubic;      g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),        0, 0, nWidth, nHeight, GraphicsUnit.Pixel);      int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };      Font crFont = null;      SizeF crSize = new SizeF();      //通过循环这个数组,来选用不同的字体大小      //如果它的大小小于图像的宽度,就选用这个大小的字体      for (int i = 0; i < 7; i++)      {        //设置字体,这里是用arial,黑体        crFont = new Font("arial", sizes[i], FontStyle.Bold);        //Measure the Copyright string in this Font        crSize = g.MeasureString(text, crFont);        if ((ushort)crSize.Width < (ushort)nWidth)          break;      }      //因为图片的高度可能不尽相同, 所以定义了      //从图片底部算起预留了5%的空间      int yPixlesFromBottom = (int)(nHeight * .08);      //现在使用版权信息字符串的高度来确定要绘制的图像的字符串的y坐标      float yPosFromBottom = ((nHeight - yPixlesFromBottom) - (crSize.Height / 2));      //计算x坐标      float xCenterOfImg = (nWidth / 2);      //把文本布局设置为居中      StringFormat StrFormat = new StringFormat();      StrFormat.Alignment = StringAlignment.Center;      //通过Brush来设置黑色半透明      SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));      //绘制版权字符串      g.DrawString(text,         //版权字符串文本        crFont,                  //字体        semiTransBrush2,              //Brush        new PointF(xCenterOfImg + 1, yPosFromBottom + 1), //位置        StrFormat);      //设置成白色半透明      SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));      //第二次绘制版权字符串来创建阴影效果      //记住移动文本的位置1像素      g.DrawString(text,         //版权文本        crFont,                  //字体        semiTransBrush,              //Brush        new PointF(xCenterOfImg, yPosFromBottom), //位置        StrFormat);      g.Dispose();      // 以下代码为保存图片时,设置压缩质量      EncoderParameters encoderParams = new EncoderParameters();      long[] quality = new long[1];      quality[0] = 100;      EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);      encoderParams.Param[0] = encoderParam;      //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。      ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();      ImageCodecInfo jpegICI = null;      for (int x = 0; x < arrayICI.Length; x++)      {        if (arrayICI[x].FormatDescription.Equals("JPEG"))        {          jpegICI = arrayICI[x];//设置JPEG编码          break;        }      }      if (jpegICI != null)      {        outBmp.Save(file, jpegICI, encoderParams);      }      else      {        outBmp.Save(file, thisFormat);      }      img.Dispose();      outBmp.Dispose();      System.IO.File.Delete(strTempFile);    }    #endregion    #region 添加图片水印    ///<summary>    /// 添加图片水印    /// </summary>    /// <param name="png">水印图片</param>    /// <param name="file">原文件</param>    /// <param name="position">水印图片的位置 0居中、1左上角、2右上角、3左下角、4右下角</param>    public void AttachPng(string png, string file)    {      if (string.IsNullOrEmpty(png))        return;      if (!System.IO.File.Exists(png))        return;      if (!System.IO.File.Exists(file))        return;      System.IO.FileInfo oFile = new System.IO.FileInfo(file);      string strTempFile = System.IO.Path.Combine(oFile.DirectoryName, Guid.NewGuid().ToString() + oFile.Extension);      oFile.CopyTo(strTempFile);      Image img = Image.FromFile(strTempFile);      ImageFormat thisFormat = img.RawFormat;      int nHeight = img.Height;      int nWidth = img.Width;      Bitmap outBmp = new Bitmap(nWidth, nHeight);      Graphics g = Graphics.FromImage(outBmp);      // 设置画布的描绘质量      g.CompositingQuality = CompositingQuality.HighQuality;      g.SmoothingMode = SmoothingMode.HighQuality;      g.InterpolationMode = InterpolationMode.HighQualityBicubic;      g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight),        0, 0, nWidth, nHeight, GraphicsUnit.Pixel);      img.Dispose();      img = Image.FromFile(png);      //Bitmap bmpPng = new Bitmap(img);      //ImageAttributes imageAttr = new ImageAttributes();      //Color bg = Color.Green;      //imageAttr.SetColorKey(bg, bg);      Size pngSize = NewSize(nWidth, nHeight, img);      int nx = 0;      int ny = 0;      int padding = 10;      if (SetPositionWater == 0)      {        nx = (nWidth - pngSize.Width) / 2;        ny = (nHeight - pngSize.Height) / 2;      }      else if (SetPositionWater == 1)      {        nx = padding;        ny = padding;      }      else if (SetPositionWater == 2)      {        nx = (nWidth - pngSize.Width) - padding;        ny = padding;      }      else if (SetPositionWater == 3)      {        nx = padding;        ny = (nHeight - pngSize.Height) - padding;      }      else      {        nx = (nWidth - pngSize.Width) - padding;        ny = (nHeight - pngSize.Height) - padding;      }      g.DrawImage(img, new Rectangle(nx, ny, pngSize.Width, pngSize.Height),        0, 0, img.Width, img.Height, GraphicsUnit.Pixel);      g.Dispose();      // 以下代码为保存图片时,设置压缩质量      EncoderParameters encoderParams = new EncoderParameters();      long[] quality = new long[1];      quality[0] = 100;      EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);      encoderParams.Param[0] = encoderParam;      //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。      ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();      ImageCodecInfo jpegICI = null;      for (int x = 0; x < arrayICI.Length; x++)      {        if (arrayICI[x].FormatDescription.Equals("JPEG"))        {          jpegICI = arrayICI[x];//设置JPEG编码          break;        }      }      if (jpegICI != null)      {        outBmp.Save(file, jpegICI, encoderParams);      }      else      {        outBmp.Save(file, thisFormat);      }      img.Dispose();      outBmp.Dispose();      System.IO.File.Delete(strTempFile);    }    #endregion    #region 得到指定mimeType的ImageCodecInfo    /// <summary>    /// 保存JPG时用    /// </summary>    /// <param name="mimeType"> </param>    /// <returns>得到指定mimeType的ImageCodecInfo </returns>    private ImageCodecInfo GetCodecInfo(string mimeType)    {      ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();      foreach (ImageCodecInfo ici in CodecInfo)      {        if (ici.MimeType == mimeType) return ici;      }      return null;    }    #endregion    #region 保存为JPEG格式,支持压缩质量选项    /// <summary>    /// 保存为JPEG格式,支持压缩质量选项    /// </summary>    /// <param name="SourceFile"></param>    /// <param name="FileName"></param>    /// <param name="Qty"></param>    /// <returns></returns>    public bool KiSaveAsJPEG(string SourceFile, string FileName, int Qty)    {      Bitmap bmp = new Bitmap(SourceFile);      try      {        EncoderParameter p;        EncoderParameters ps;        ps = new EncoderParameters(1);        p = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, Qty);        ps.Param[0] = p;        bmp.Save(FileName, GetCodecInfo("image/jpeg"), ps);        bmp.Dispose();        return true;      }      catch      {        bmp.Dispose();        return false;      }    }    #endregion    #region 将图片压缩到指定大小    /// <summary>    /// 将图片压缩到指定大小    /// </summary>    /// <param name="FileName">待压缩图片</param>    /// <param name="size">期望压缩后的尺寸</param>    public void CompressPhoto(string FileName, int size)    {      if (!System.IO.File.Exists(FileName))        return;      int nCount = 0;      System.IO.FileInfo oFile = new System.IO.FileInfo(FileName);      long nLen = oFile.Length;      while (nLen > size * 1024 && nCount < 10)      {        string dir = oFile.Directory.FullName;        string TempFile = System.IO.Path.Combine(dir, Guid.NewGuid().ToString() + "." + oFile.Extension);        oFile.CopyTo(TempFile, true);        KiSaveAsJPEG(TempFile, FileName, 70);        try        {          System.IO.File.Delete(TempFile);        }        catch { }        nCount++;        oFile = new System.IO.FileInfo(FileName);        nLen = oFile.Length;      }    }    #endregion    #endregion    #region common method    /// <summary>    /// 图片上传错误编码    /// </summary>    /// <param name="code"></param>    /// <returns></returns>    private string GetCodeMessage(int code)    {      var dic = new Dictionary<int, string>(){    {0,"系统配置错误"},    {1,"上传图片成功"},    {2,string.Format( "对不起,上传格式错误!请上传{0}格式图片",SetAllowFormat)},    {3,string.Format("超过文件上传大小,不得超过{0}M",SetAllowSize)},    {4,"未上传文件"},    {5,""},    {6,"缩略图长度和宽度配置错误"},    {7,"检测图片宽度限制"}     };      return dic[code];    }    private void TryError(ResponseMessage rm, int code)    {      rm.IsError = true;      rm.Message = GetCodeMessage(code);    }    private void TryError(ResponseMessage rm, string message)    {      rm.IsError = true;      rm.Message = message;    }    #endregion    #region models    public enum CutMode    {      /// <summary>      /// 根据高宽剪切      /// </summary>      CutWH = 1,      /// <summary>      /// 根据宽剪切      /// </summary>      CutW = 2,      /// <summary>      /// 根据高剪切      /// </summary>      CutH = 3,      /// <summary>      /// 缩放不剪裁      /// </summary>      CutNo = 4    }    public class ResponseMessage    {      /// <summary>      /// 是否遇到错误      /// </summary>      public bool IsError { get; set; }      /// <summary>      /// web路径      /// </summary>      public string WebPath { get; set; }      /// <summary>      /// 文件物理路径      /// </summary>      public string filePath { get; set; }      /// <summary>      /// 反回消息      /// </summary>      public string Message { get; set; }      /// <summary>      /// 文件大小      /// </summary>      public double Size { get; set; }      /// <summary>      /// 图片名      /// </summary>      public string FileName { get; set; }      /// <summary>      /// 图片目录      /// </summary>      public string Directory      {        get        {          if (WebPath == null) return null;          return WebPath.Replace(FileName, "");        }      }      /// <summary>      /// 缩略图路径      /// </summary>      public string SmallPath(int index)      {        return string.Format("{0}{1}_{2}{3}", Directory, Path.GetFileNameWithoutExtension(FileName), index, Path.GetExtension(FileName));      }    }    #endregion  }}