HiddenFieldDesigner Class
Assembly: System.Design (in system.design.dll)
In a visual designer, when the user switches from Source to Design view, the markup source code that describes a HiddenField control is parsed and a design-time version of the control is created on the design surface. When the user switches back to Source view, the design-time control is persisted to the markup source code and edited into the markup for the Web page. The HiddenFieldDesigner class provides design-time support for the HiddenField in a visual designer.
The GetDesignTimeHtml method returns the markup that is used to render the associated HiddenField at design time. The Initialize method prepares the designer to view, edit, and design the associated HiddenField.
The following code example shows how to extend the HiddenFieldDesigner class to change the appearance of controls that are derived from the HiddenField control at design time.
The example derives the MyHiddenField control from the HiddenField. The MyHiddenField is a copy of the HiddenField. The example also derives the MyHiddenFieldDesigner class from the HiddenFieldDesigner class and applies a DesignerAttribute attribute for the MyHiddenFieldDesigner on the MyHiddenField control.
The MyHiddenFieldDesigner overrides the GetDesignTimeHtml method to generate a placeholder that includes the Value property in the placeholder, along with the control class name and the ID property.
- SecurityPermission for calling unmanaged code. Demand value: Demand. Permission value: UnmanagedCode
System.ComponentModel.Design.ComponentDesigner
System.Web.UI.Design.HtmlControlDesigner
System.Web.UI.Design.ControlDesigner
System.Web.UI.Design.WebControls.HiddenFieldDesigner
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.