正在阅读:Asp.net生成缩略图Asp.net生成缩略图

2004-04-16 10:26 出处:CSDN 作者:netxie 责任编辑:sdq

  当我们要上传图片的时候,往往需要生成缩略图,以往我们要使用第三方控件才能完成。在asp.net中用下面方法轻松搞定:

  <script language="VB" runat="server">
  Sub Page_Load(sender As Object, e As EventArgs)

  Dim image,aNewImage As System.Drawing.Image
  dim width,height,newwidth,newheight as integer
  Dim callb As System.Drawing.Image.GetThumbnailImageAbort

  '生成缩略图
  image=System.Drawing.Image.FromFile(Server.MapPath("classpic/"+"rs1.jpg"))
  width=image.Width
  height=image.height
  if width>height then
  newwidth=110
  newheight=image.height/image.Width*newwidth
  else
  newheight=110
  newwidth=image.Width/image.height*newheight
  end if

  aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())
  aNewImage.Save(Server.MapPath("smallpic/"+"rs1.gif"))
  image.Dispose()

  End Sub
  </script>

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