ImportedFromTypeLibAttribute Třída

Definice

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

Dědičnost

Object

Attribute

ImportedFromTypeLibAttribute

Atributy

AttributeUsageAttribute ComVisibleAttribute

Příklady

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

Poznámky

Tento atribut můžete použít u sestavení, i když Tlbimp.exe (Type Library Importer) jej obvykle použije pro vás, pokud se jedná o knihovnu typů.

Primárním použitím atributu je zachycení původního zdroje informací o typu. Můžete například importovat A.tlb jako interop sestavení s názvem A.dll a mít B.dll referenční A.dll sestavení. Při exportu B.dll do B.tlb způsobí tento atribut odkazy v B.tlb, které odkazují na A.dll místo A.tlb. To by nemělo být zaměňováno s ComImportAttribute, který určuje, že jednotlivý typ je implementován v modelu COM.

Konstruktory

Vlastnosti

Metody

Explicitní implementace rozhraní

Platí pro

Viz také

• ComImportAttribute
• Tlbimp.exe (import knihovny typů)