TypeLibVarAttribute Class

Definition

Namespace:

System.Runtime.InteropServices

Assembly:

System.Runtime.InteropServices.dll

Source:

TypeLibVarAttribute.cs

Contains the VARFLAGS that were originally imported for this field from the COM type library.

public ref class TypeLibVarAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)]
public sealed class TypeLibVarAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)>]
type TypeLibVarAttribute = class
    inherit Attribute

Public NotInheritable Class TypeLibVarAttribute
Inherits Attribute

Inheritance

Object

Attribute

TypeLibVarAttribute

Attributes

AttributeUsageAttribute

Examples

The following example demonstrates how to get the TypeLibVarAttribute value of a field.

using namespace System;
using namespace System::Reflection;
using namespace System::Runtime::InteropServices;

ref class ClassD
{
public:
   static bool IsHiddenField( FieldInfo^ fi )
   {
      array<Object^>^FieldAttributes = fi->GetCustomAttributes( TypeLibVarAttribute::typeid, true );
      if ( FieldAttributes->Length > 0 )
      {
         TypeLibVarAttribute^ tlv = dynamic_cast<TypeLibVarAttribute^>(FieldAttributes[ 0 ]);
         TypeLibVarFlags flags = tlv->Value;
         return (flags & TypeLibVarFlags::FHidden) != (TypeLibVarFlags)0;
      }

      return false;
   }
};

using System;
using System.Reflection;
using System.Runtime.InteropServices;

namespace D
{
    class ClassD
    {
        public static bool IsHiddenField( FieldInfo fi )
        {
            object[] FieldAttributes = fi.GetCustomAttributes( typeof( TypeLibVarAttribute ), true);
        
            if( FieldAttributes.Length > 0 )
            {
                TypeLibVarAttribute tlv = ( TypeLibVarAttribute )FieldAttributes[0];
                TypeLibVarFlags  flags = tlv.Value;
                return ( flags & TypeLibVarFlags.FHidden ) != 0;
            }
            return false;
        }
    }
}

Imports System.Reflection
Imports System.Runtime.InteropServices

Module D
    Public Function IsHiddenField(ByVal fi As FieldInfo) As Boolean
        Dim FieldAttributes As Object() = fi.GetCustomAttributes(GetType(TypeLibVarAttribute), True)

        If FieldAttributes.Length > 0 Then
            Dim tlv As TypeLibVarAttribute = FieldAttributes(0)
            Dim flags As TypeLibVarFlags = tlv.Value
            Return (flags & TypeLibVarFlags.FHidden) > 0
        End If
        Return False
    End Function
End Module

Remarks

The Tlbimp.exe (Type Library Importer) applies this attribute to fields.

This attribute is applied when a type library is imported and should never be changed. It is only applied when the method's VARFLAGS evaluate to non-zero. The attribute is designed to be used by tools that need to know how the original VARFLAGS were set. The common language runtime does not use this attribute.

Constructors

TypeLibVarAttribute(Int16)	Initializes a new instance of the TypeLibVarAttribute class with the specified TypeLibVarFlags value.
TypeLibVarAttribute(TypeLibVarFlags)	Initializes a new instance of the TypeLibVarAttribute class with the specified TypeLibVarFlags value.

Properties

TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)
Value	Gets the TypeLibVarFlags value for this field.

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
IsDefaultAttribute()	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute)
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)

See also

• Tlbimp.exe (Type Library Importer)