Two basic Icon() questions.

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Hello,

I have some basic questions regarding Icons.

The ms-help page for System.Drawing.Icon

ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.en/cpref8/html/T_System_Drawing_Icon_Members.htm

says that "Icons can be thought of as transparent bitmaps, although their
size is determined by the system."

1) Can you please remind me why it is good that icons have transparent
regions? When is that feature useful?

2) How does the system determine their size? Does the system limit the icon
size to 64x64 pixels, 32x32, or some such sensible icon size?
Thanks for ty
--
Allan Michaels
Ann Arbor, MI

[Walter Wang [MSFT]]

Hi Allan,

When a bitmap has transparent background, means when it's drawed over
another object, you will still see the object behind the icon through the
background instead of seeing a square block. You should be using this
feature everyday: most window will have an icon in its title bar, and the
icon is normally drawn using transparent background. Also, icons are
usually used by a treeview or listview that you will see in explorer
window. Icons' background are transparent so that you could see the
background color of the explorer window.

The icon size is not limited to 64x64; for example, Vista has support for
256x256 size: http://msdn2.microsoft.com/en-us/library/aa511280.aspx

Hope this helps.

Sincerely,
Walter Wang (wa****@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Thank you for the reminders on Icon backgrounds.
And thanks for the link to the Vista Icon guidelines.