在ASP.NET中上传图片并生成缩略图的C#源码(2)

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  public void UploadFile(object sender, System.EventArgs e)
  {
  
  string imgNameOnly, imgNameNoExt, imgExt;
  string imgThumbnail;
  int erroNumber = 0;
  System.Drawing.Image oriImg, newImg;
  string strFePicSavePath = ConfigurationSettings.AppSettings["FePicSavePath"].ToString();
  string strFePicThumbFormat = ConfigurationSettings.AppSettings["FePicThumbFormat"].ToString().ToLower();
  int intFeThumbWidth = Int32.Parse(ConfigurationSettings.AppSettings["FePicThumbWidth"]);
  string fileExt;
  
  StringBuilder picInfo = new StringBuilder();
  
  if(Page.IsValid)
  {
  
  
  for(int i = 0;i < Request.Files.Count; i++)
  {
  HttpPostedFile PostedFile = Request.Files[i];
  fileExt = (System.IO.Path.GetExtension(PostedFile.FileName)).ToString().ToLower();
  
  imgNameOnly = System.IO.Path.GetFileName(PostedFile.FileName);
  if(fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".png")
  {
  
  if(System.IO.File.Exists(strFePicSavePath + imgNameOnly) && (checkboxlistRewrite.Items[i].Selected == false))
  {
  erroNumber = erroNumber + 1;
  picInfo.Append("<b>错误：</b>文件("+ (i+1) +") " + imgNameOnly + " 已经存在，请修改文件名<br/>" );
  }
  }
  else
  {
  erroNumber = erroNumber + 1;
  picInfo.Append("<b>错误：</b>文件("+ (i+1) +") " + imgNameOnly + " 扩展名 " + fileExt + " 不被许可<br/>" );
  }
  
  }
  
  if(erroNumber > 0)
  {
  picInfo.Append("<font color=red>全部操作均未完成，请修改错误，再进行操作</font><br/>");
  }
  else
  {
  for(int i = 0;i < Request.Files.Count; i++)
  {
  
  HttpPostedFile PostedFile = Request.Files[i];
  imgNameOnly = System.IO.Path.GetFileName(PostedFile.FileName);
  imgNameNoExt = System.IO.Path.GetFileNameWithoutExtension(PostedFile.FileName);
  imgExt = System.IO.Path.GetExtension(PostedFile.FileName).ToString().ToLower();
  
  
  oriImg = System.Drawing.Image.FromStream(PostedFile.InputStream);
  newImg = oriImg.GetThumbnailImage(intFeThumbWidth, intFeThumbWidth * oriImg.Height/oriImg.Width,null,new System.IntPtr(0));
  switch(imgExt)
  {
  //case ".jpeg":
  case ".jpg":
  oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Jpeg);
  break;
  case ".gif":
  oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Gif);
  break;
  case ".png":
  oriImg.Save(strFePicSavePath + imgNameOnly , System.Drawing.Imaging.ImageFormat.Png);
  break;
  }
  
  //oriImg.Save(ConfigurationSettings.AppSettings["FePicSavePath"] + imgNameNoExt + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
  
  switch(strFePicThumbFormat)
  {
  //jpeg format can get the smallest file size, and the png is the largest size
  //case "jpeg":
  case "jpg":
  newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
  imgThumbnail = imgNameOnly + "_thumb.jpg";
  break;
  case "gif":
  newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.gif",System.Drawing.Imaging.ImageFormat.Gif);
  imgThumbnail = imgNameOnly + "_thumb.gif";
  break;
  case "png":
  newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.png",System.Drawing.Imaging.ImageFormat.Png);
  imgThumbnail = imgNameOnly + "_thumb.png";
  break;
  default:
  newImg.Save(strFePicSavePath + imgNameOnly + "_thumb.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);
  imgThumbnail = imgNameOnly + "_thumb.jpg";
  break;
  
  }//switch
  
  picInfo.Append("<b>文件　名：</b>" + imgNameOnly + " ( " + oriImg.Width + " x " + oriImg.Height + " ) " + PostedFile.ContentLength/1024 + "KB<br/>");
  picInfo.Append("<b>缩略图名：</b>" + imgThumbnail + " ( " + newImg.Width + " x " + newImg.Height + " )<br/><br/>");
  
  oriImg.Dispose();
  newImg.Dispose();
  
  }//for
  picInfo.Append("<font color=red>所有操作成功</font><br/>");
  
  }// if erronumber = 0
  
  
  
  }
  else
  {
  picInfo.Append("<font color=red>有错误，请检查。操作未成功</font><br/>");
  
  }
  
  lblPicInfo.Text = picInfo.ToString();
  
  }
  </FONT>
  
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