主题：上传图像,按比例缩小,怎么实现?

Dim file As String = "d:\test.jpg"
Dim img As image = getImage(file)
Dim bmp As bitmap
If img.width > 400 Then
    bmp  = new bitmap(img, 400, 400 * (img.height / img.width))
    img = bmp
End If
If img.height > 280 Then
    bmp  = new bitmap(img, 280 * (img.width / img.height), 280)
End If
bmp.save("d:\缩略图.jpg")
bmp.Dispose