上传图片并显示缩略图的最简单方法(c#)-蒲公英云

上传图片并显示缩略图的最简单方法(c#)

![None.gif][] private void fileUpload_Click( object sender, System.EventArgs e)
![ExpandedBlockStart.gif][None.gif]![ContractedBlock.gif][None.gif] {
![InBlock.gif][None.gif] // 模拟数据库里取出byte[]再显示缩略,
![InBlock.gif][None.gif] // 模拟方法：先上传，把stream转成byte[],再把byte[]放在stream里,再输出
![InBlock.gif][None.gif]
![InBlock.gif][None.gif] // 上传
![InBlock.gif][None.gif] System.IO.Stream fs = jpgUpload.PostedFile.InputStream;
![InBlock.gif][None.gif] int nBytes = jpgUpload.PostedFile.ContentLength;
![InBlock.gif][None.gif] byte[] ByteArray = new byte[nBytes];
![InBlock.gif][None.gif] int nBytesRead = fs.Read(ByteArray, 0, nBytes);
![InBlock.gif][None.gif] MemoryStream mBytes = new MemoryStream(ByteArray,0,nBytes);
![InBlock.gif][None.gif]
![InBlock.gif][None.gif] // 转为stream,处理缩略
![InBlock.gif][None.gif] System.Drawing.Image _img;
![InBlock.gif][None.gif] _img = System.Drawing.Image.FromStream(mBytes);
![InBlock.gif][None.gif] System.Drawing.Image _thumbImg = _img.GetThumbnailImage(Convert.ToInt32(_img.Width* 0.3),Convert.ToInt32( _img.Height * 0.3),null, IntPtr.Zero);
![InBlock.gif][None.gif]
![InBlock.gif][None.gif] // 显示到客户端
![InBlock.gif][None.gif] Response.ContentType = this.jpgUpload.PostedFile.ContentType;
![InBlock.gif][None.gif] MemoryStream MemStream = new MemoryStream();
![InBlock.gif][None.gif] _thumbImg.Save(MemStream, System.Drawing.Imaging.ImageFormat.Jpeg);
![InBlock.gif][None.gif] MemStream.WriteTo(Response.OutputStream);
![InBlock.gif][None.gif] Response.Flush();
![ExpandedBlockEnd.gif][None.gif] }