December 2001
Beginner
464 pages
13h 51m
English
Content preview from Programming Visual Basic .NETBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Component Attributes
As explained in Chapter 2, attributes can be added to code elements to provide additional information about those elements. The System.ComponentModel namespace defines several attributes for use in component, control, and form declarations. These attributes don’t affect component behavior. Rather, they provide information that is used or displayed by the Visual Studio .NET IDE. The following is a description of each attribute:
-
AmbientValueAttribute For ambient properties, specifies the property value that will mean “get this property’s actual value from wherever ambient values come from for this property.” Ambient properties are properties able to get their values from another source. For example, the BackColor property of a Label control can be set either to a specific Color value or to the special value Color.Empty, which causes the Label’s background color to be the same as the background color of the form on which it is placed.
Putting this attribute on a property definition isn’t what causes the property to behave as an ambient property: the control itself must be written such that when the special value is written to the property, the control gets the actual value from the appropriate location. This attribute simply provides the Windows Forms Designer with a way to discover what the special value is.
When specifying this attribute, pass the special value to the attribute’s constructor. For example,
<AmbientValue(0)>.-
BindableAttribute Indicates whether ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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