Chapter 35. The System.Web.UI.Design Namespace
System.Web.UI.Design namespace contains types used for
providing design-time support for the Web Forms user interface. These types fall
into four basic categories: type converters, UI type editors, designers, and
other helper classes (such as classes that provide ASP.NET data binding support).
Type converters allow control properties to be converted to and from base data
types, which allows them to be displayed and edited in the Properties Window.
Type converters also extend runtime support, but they are only used implicitly
and never instantiated directly. Type converter classes derive from
System.ComponentModel.TypeConverter and end with the word
“Converter” by convention. Unlike type converters, UI type editors are used
exclusively in the design environment. They provide the custom user interface
that is used to select special property values from the Properties Window (like
a control’s color). UI type editors derive from
System.Drawing.Design.UITypeEditor and end with the word
Designers help provide the design-time representation of a control. They derive
System.ComponentModel.Design.ComponentDesigner and end
with the word “Designer.” The
System.Web.UI.Design namespace contains the base designers used for ASP.NET controls. ASP.NET controls use different designers than Windows Form controls because they are rendered by using HTML rather than Windows-specific GDI+ functions. For custom designers that extend specific ...