.NET Framework Class Library
ConstructorNeedsTagAttribute Class

Specifies that a server control needs a tag name in its constructor.

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.Web.UIConstructorNeedsTagAttribute

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Syntax
<[%$TOPIC/twh485fc_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/twh485fc_en-us_VS_110_2_0_0_0_1%].Class)> _
Public NotInheritable Class ConstructorNeedsTagAttribute _
	Inherits [%$TOPIC/twh485fc_en-us_VS_110_2_0_0_0_2%]
[[%$TOPIC/twh485fc_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/twh485fc_en-us_VS_110_2_0_1_0_1%].Class)]
public sealed class ConstructorNeedsTagAttribute : [%$TOPIC/twh485fc_en-us_VS_110_2_0_1_0_2%]
[[%$TOPIC/twh485fc_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/twh485fc_en-us_VS_110_2_0_2_0_1%]::Class)]
public ref class ConstructorNeedsTagAttribute sealed : public [%$TOPIC/twh485fc_en-us_VS_110_2_0_2_0_2%]
[<[%$TOPIC/twh485fc_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/twh485fc_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/twh485fc_en-us_VS_110_2_0_3_0_2%].Class)>]
type ConstructorNeedsTagAttribute =  
    class 
        inherit [%$TOPIC/twh485fc_en-us_VS_110_2_0_3_0_3%] 
    end
public final class ConstructorNeedsTagAttribute extends [%$TOPIC/twh485fc_en-us_VS_110_2_0_4_0_0%]

The ConstructorNeedsTagAttribute type exposes the following members.

Constructors
  NameDescription
Public method ConstructorNeedsTagAttributeInitializes a new instance of the ConstructorNeedsTagAttribute class.
Public method ConstructorNeedsTagAttribute(Boolean)Initializes a new instance of the ConstructorNeedsTagAttribute class.
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Properties
  NameDescription
Public property NeedsTagIndicates whether a control needs a tag name in its constructor. This property is read-only.
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 EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
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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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

For background information, see Extending Metadata Using Attributes.

Examples
' Attach the ConstructorNeedsTagAttribute to the custom Simple 
' class, which is derived from the WebControl class. This  
' instance of the ConstructorNeedsTagAttribute class sets the 
' NeedsTag property to true.
<ConstructorNeedsTagAttribute(True)>  _
<AspNetHostingPermission(SecurityAction.Demand, _
  Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class Simple
  Inherits WebControl

  Private NameTag As String = "" 


  Public Sub New(tag As String)
     Me.NameTag = tag
  End Sub 'New 

  Private UserMessage As String = Nothing 

  ' Create a property named ControlValue.    
  Public Property ControlValue() As [String]
     Get 
        Return UserMessage
     End Get 
     Set
        UserMessage = value
     End Set 
  End Property 

  Protected Overrides Sub Render(output As HtmlTextWriter)
     output.Write("Testing the ConstructorNeedsTagAttribute Class.")
  End Sub 'Render
End Class 'Simple
// Attach the ConstructorNeedsTagAttribute to the custom Simple 
  // class, which is derived from the WebControl class. This  
  // instance of the ConstructorNeedsTagAttribute class sets the 
  // NeedsTag property to true.
  [ConstructorNeedsTagAttribute(true)]
  [AspNetHostingPermission(SecurityAction.Demand, 
     Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class Simple : WebControl 
  {
     private String NameTag = "";

     public Simple(String tag)
      {
            this.NameTag = tag;
      }         

      private String   UserMessage = null;

      // Create a property named ControlValue. 
      public String ControlValue 
      {
         get 
         {
            return UserMessage;
         }
         set 
         {
            UserMessage = value;
         }
      }                



      protected override void Render(HtmlTextWriter output) 
      {
         output.Write("Testing the ConstructorNeedsTagAttribute Class.");
      }
}      
Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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.