當我們要上傳圖片的時候，往往需要生成縮略圖，以往我們要使用第三方控件才能完成。在ASP.Net中用下面方法輕松搞定
<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
''生成縮略圖
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>
