ImportedFromTypeLibAttribute Classe

Définition

public ref class ImportedFromTypeLibAttribute sealed : Attribute

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

[System.AttributeUsage(System.AttributeTargets.Assembly, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class ImportedFromTypeLibAttribute : Attribute

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

[<System.AttributeUsage(System.AttributeTargets.Assembly, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ImportedFromTypeLibAttribute = class
    inherit Attribute

Public NotInheritable Class ImportedFromTypeLibAttribute
Inherits Attribute

Héritage

Object

Attribute

ImportedFromTypeLibAttribute

Attributs

AttributeUsageAttribute ComVisibleAttribute

Exemples

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

class ClassA
{
private:
   static bool IsCOMAssembly( Assembly^ a )
   {
      array<Object^>^AsmAttributes = a->GetCustomAttributes( ImportedFromTypeLibAttribute::typeid, true );
      if ( AsmAttributes->Length > 0 )
      {
         ImportedFromTypeLibAttribute^ imptlb = dynamic_cast<ImportedFromTypeLibAttribute^>(AsmAttributes[ 0 ]);
         String^ strImportedFrom = imptlb->Value;
         
         // Print out the name of the DLL from which the assembly is imported.
         Console::WriteLine( "Assembly {0} is imported from {1}", a->FullName, strImportedFrom );
         return true;
      }

      // This is not a COM assembly.
      Console::WriteLine( "Assembly {0} is not imported from COM", a->FullName );
      return false;
   }
};

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

namespace A
{
    class ClassA
    {
        public static bool IsCOMAssembly(Assembly a)
        {
            object[] AsmAttributes = a.GetCustomAttributes(typeof(ImportedFromTypeLibAttribute), true);
            if (AsmAttributes.Length > 0)
            {
                ImportedFromTypeLibAttribute imptlb = (ImportedFromTypeLibAttribute)AsmAttributes[0];
                string strImportedFrom = imptlb.Value;

                // Print out the name of the DLL from which the assembly is imported.
                Console.WriteLine("Assembly " + a.FullName + " is imported from " + strImportedFrom);

                return true;
            }
            // This is not a COM assembly.
            Console.WriteLine("Assembly " + a.FullName + " is not imported from COM");
            return false;
        }
    }
}

Imports System.Reflection
Imports System.Runtime.InteropServices

Module A
    Public Function IsCOMAssembly(ByVal a As System.Reflection.Assembly) As Boolean

        Dim AsmAttributes As Object() = a.GetCustomAttributes(GetType(ImportedFromTypeLibAttribute), True)
        If AsmAttributes.Length = 1 Then
            Dim imptlb As ImportedFromTypeLibAttribute = AsmAttributes(0)
            Dim strImportedFrom As String = imptlb.Value

            ' Print out the name of the DLL from which the assembly is imported.
            Console.WriteLine("Assembly " + a.FullName + " is imported from " + strImportedFrom)

            Return True
        End If

        ' This is not a COM assembly.
        Console.WriteLine("Assembly " + a.FullName + " is not imported from COM")

        Return False
    End Function
End Module

Remarques

Vous pouvez appliquer cet attribut à des assemblys, bien que le Tlbimp.exe (Importateur de bibliothèque de types) l’applique généralement quand il importe une bibliothèque de types.

L’utilisation principale de l’attribut consiste à capturer la source d’origine des informations de type. Par exemple, vous pouvez importer A.tlb en tant qu’assembly d’interopérabilité appelé A.dll et avoir des B.dll de référence d’assembly A.dll. Lorsque vous exportez B.dll vers B.tlb, cet attribut provoque les références dans B.tlb qui pointent vers A.dll à pointer à la place vers A.tlb. Cela ne doit pas être confondu avec le ComImportAttribute, qui spécifie qu’un type individuel est implémenté dans COM.

Voir aussi

• ComImportAttribute
• Tlbimp.exe (importateur de bibliothèques de types)