.NET Framework Class Library
NonVisualControlAttribute Class

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.

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.Web.UINonVisualControlAttribute

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Syntax
<[%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_0_0_1%].Class)> _
Public NotInheritable Class NonVisualControlAttribute _
	Inherits [%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_0_0_2%]
[[%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_1_0_1%].Class)]
public sealed class NonVisualControlAttribute : [%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_1_0_2%]
[[%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_2_0_1%]::Class)]
public ref class NonVisualControlAttribute sealed : public [%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_2_0_2%]
[<[%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_3_0_2%].Class)>]
type NonVisualControlAttribute =  
    class 
        inherit [%$TOPIC/t2xbwdy6_en-us_VS_110_2_0_3_0_3%] 
    end

The NonVisualControlAttribute type exposes the following members.

Constructors
  NameDescription
Public method NonVisualControlAttributeInitializes a new instance of the NonVisualControlAttribute class.
Public method 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.
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Properties
  NameDescription
Public property IsNonVisualGets a value indicating whether the control is non-visual.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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Methods
  NameDescription
Public method EqualsReturns a value that indicates whether this instance is equal to a specified object. (Overrides AttributeEquals(Object).)
Public method GetHashCodeReturns the hash code for this instance. (Overrides AttributeGetHashCode.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeReturns a value indicating whether the current instance is equivalent to a default instance of the NonVisualControlAttribute class. (Overrides AttributeIsDefaultAttribute.)
Public method MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
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Fields
  NameDescription
Public field Static member DefaultReturns a NonVisualControlAttribute instance that represents the application-defined default value of the attribute. This field is read-only.
Public field Static member NonVisualReturns 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.
Public field Static member VisualGets a NonVisualControlAttribute instance that is applied to a Web control to be treated as a visual control during design time.
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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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.

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
    Inherits Control

    ' Add an implementation of custom non-visual control. 

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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