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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
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<script language="VB" runat="server">
3
Sub Page_Load(sender As Object, e As EventArgs)
4
5
6Dim image,aNewImage As System.Drawing.Image
7dim width,height,newwidth,newheight as integer
8Dim callb As System.Drawing.Image.GetThumbnailImageAbort
9
10
11''生成缩略图
12image=System.Drawing.Image.FromFile(Server.MapPath("classpic/"+"rs1.jpg"))
13width=image.Width
14height=image.height
15if width>height then
16newwidth=110
17newheight=image.height/image.Width*newwidth
18else
19newheight=110
20newwidth=image.Width/image.height*newheight
21end if
22
23
24aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())
25aNewImage.Save(Server.MapPath("smallpic/"+"rs1.gif"))
26image.Dispose()
27
28
29
End Sub
30</script>
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32
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2
<script language="VB" runat="server">
3
Sub Page_Load(sender As Object, e As EventArgs)4
5
6
Dim image,aNewImage As System.Drawing.Image7
dim width,height,newwidth,newheight as integer8
Dim callb As System.Drawing.Image.GetThumbnailImageAbort9
10
11
''生成缩略图12
image=System.Drawing.Image.FromFile(Server.MapPath("classpic/"+"rs1.jpg"))13
width=image.Width14
height=image.height15
if width>height then16
newwidth=11017
newheight=image.height/image.Width*newwidth18
else19
newheight=11020
newwidth=image.Width/image.height*newheight21
end if22
23
24
aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())25
aNewImage.Save(Server.MapPath("smallpic/"+"rs1.gif"))26
image.Dispose()27
28
29
End Sub30
</script>31
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