What value each of these classes add in WPF

I know 开发者_开发百科we have following hierarchy of classes in WPF.

Visual
    UIElement
        FrameWorkElement
            Control

I am interested in finding out what value each of these classes add to make a final UI control for example a Textbox. What is significance of each individual class

You can find all of this information within the MSDN documentation.

Significance of individual elements

• Visual: Provides rendering support in WPF, which includes hit testing, coordinate transformation, and bounding box calculations.

• UIElement: A base class for WPF core level implementations building on Windows Presentation Foundation (WPF) elements and basic presentation characteristics.

• FrameworkElement: Provides a WPF framework-level set of properties, events, and methods for Windows Presentation Foundation (WPF) elements.

• Control: Represents the base class for user interface (UI) elements that use a ControlTemplate to define their appearance.

• TextBoxBase: An abstract base class that provides functionality for text editing controls.

• TextBox: Represents a control that can be used to display or edit unformatted text.

Finding out what value each of these classes add to make a final UI control

If you take a look at the TextBox properties, you will see in the descriptions of properties that are provided by elements higher hierarchy text like this:

(Inherited from {Element Name})

Reviewing the properties of the TextBox control will allow you to determine how it is composed from the inheritance hierarchy through inheritance.