asp.net control design-time Support (5)

A. Designer

1. What is a designer, look at the image below

So no need to explain the concept, the designer is naturally help you to quickly complete the control of the basic editing, save time.

The designer is a form page, so if you want to make a designer, you need some form basics.

2. Principle of realization

(1) The designer can be said to be the extension of the property panel, in general, the designer will be the control of commonly used properties are listed to facilitate the setting

(2) The principle is the same as 3rd, when the designer is opened, the form gets the property value by inheriting the ControlDesigner class (assuming Samplecontroldesigner). It is important to return by setting the Samplecontroldesigner property and then updating the Control page markup through the Updatedesigntimehtml method.