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HiddenFieldDesigner Class

Provides design-time support in a visual designer for the HiddenField control.

Namespace:  System.Web.UI.Design.WebControls
Assembly:  System.Design (in System.Design.dll)

[SecurityPermissionAttribute(SecurityAction::Demand, Flags = SecurityPermissionFlag::UnmanagedCode)]
public ref class HiddenFieldDesigner : public ControlDesigner

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.

No code example is currently available or this language may not be supported.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0