NonVisualControlAttribute Class

Reference

Definition

Namespace:: System.Web.UI

Assembly:: System.Web.dll

Important

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Defines the attribute that indicates whether a control is treated as a visual or non-visual control during design time. This class cannot be inherited.

public ref class NonVisualControlAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class)]
public sealed class NonVisualControlAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class)>]
type NonVisualControlAttribute = class
    inherit Attribute

Public NotInheritable Class NonVisualControlAttribute
Inherits Attribute

Inheritance: Object

Attribute
NonVisualControlAttribute

Attributes: AttributeUsageAttribute

Examples

The following code example demonstrates how you can apply the NonVisualControlAttribute attribute to a class. In this example, the default NonVisualControlAttribute attribute is applied to a data source control. This is equivalent to the NonVisual field.

[NonVisualControlAttribute()]
public class CustomNonVisualControl : Control
{
    // Add an implementation of custom non-visual control.
}

<NonVisualControlAttribute()> _
Public Class CustomNonVisualControl
    Inherits Control

    ' Add an implementation of custom non-visual control.

End Class

Remarks

The NonVisualControlAttribute attribute is applied to controls that are not rendered to the client, such as data source controls and the WebPartManager control. During design time, a page developer might decide to hide all non-visual controls. The designer would mark as invisible all of the controls with the NonVisualControlAttribute attribute set to true.

Examples of controls that employ the NonVisualControlAttribute attribute are DataSourceControl, HierarchicalDataSourceControl, HiddenField, and WebPartManager.

Constructors

NonVisualControlAttribute()	Initializes a new instance of the NonVisualControlAttribute class.
NonVisualControlAttribute(Boolean)	Initializes a new instance of the NonVisualControlAttribute class, using the specified Boolean value to determine whether the attribute represents a visual or non-visual control.

Fields

Default	Returns a NonVisualControlAttribute instance that represents the application-defined default value of the attribute. This field is read-only.
NonVisual	Returns a NonVisualControlAttribute instance that is applied to a Web control to be treated as a non-visual control during design time. This field is read-only.
Visual	Gets a NonVisualControlAttribute instance that is applied to a Web control to be treated as a visual control during design time.

Properties

IsNonVisual	Gets a value indicating whether the control is non-visual.
TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object.
GetHashCode()	Returns the hash code for this instance.
GetType()	Gets the Type of the current instance. (Inherited from Object)
IsDefaultAttribute()	Returns a value indicating whether the current instance is equivalent to a default instance of the NonVisualControlAttribute class.
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)

Applies to

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