技术资料 > .Net专区 > Asp.Net开发 : 上传(upload)文件的codebehind代码

上传(upload)文件的codebehind代码

March 25,2004

功能：
1。把图片文件(JPG GIF PNG)上传，
2。保存到指定的路径（在web.config中设置路径，以文件的原有格式保存），
3。并自动生成指定宽度的（在web.config中设置宽度）
4。和指定格式的（在web.config中指定缩略图的格式）
5。和原图比例相同的缩略图(根据宽度和原图的宽和高计算所略图的高度)
6。可以判断是否已经存在文件
7。如果不覆盖，则给出错误
8。如果选中"覆盖原图"checkbox，则覆盖原图。
9。可以根据要求，在webform上设置1个以上的file input和相应的checkbox
10。并在文件上传完毕后，显示原图的文件名，尺寸，字节，和
11。缩略图的文件名尺寸。
12。缩略图的文件名格式：原图+"_thumb."+指定格式，如：test.jpg_thumb.gif,以便于管理。

--------------------
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;
 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.Selected == false))
 {
 erroNumber = erroNumber + 1;
 picInfo.Append("错误：文件("+ (i+1) +") " + imgNameOnly + " 已经存在，请修改文件名 " );
 }
 }
 else
 {
 erroNumber = erroNumber + 1;
 picInfo.Append("错误：文件("+ (i+1) +") " + imgNameOnly + " 扩展名 " + fileExt + " 不被许可 " );
 }

 }

 if(erroNumber > 0)
 {
 picInfo.Append("全部操作均未完成，请修改错误，再进行操作 ");
 }
 else
 {
 for(int i = 0;i < Request.Files.Count; i++)
 {

 HttpPostedFile PostedFile = Request.Files;
 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("文件　名：" + imgNameOnly + " ( " + oriImg.Width + " x " + oriImg.Height + " ) " + PostedFile.ContentLength/1024 + "KB ");
 picInfo.Append("缩略图名：" + imgThumbnail + " ( " + newImg.Width + " x " + newImg.Height + " ) ");

 oriImg.Dispose();
 newImg.Dispose();

 }//for
 picInfo.Append("所有操作成功 ");

 }// if erronumber = 0



 }
 else
 {
 picInfo.Append("有错误，请检查。操作未成功 ");

 }

 lblPicInfo.Text = picInfo.ToString();

 }