ImportedFromTypeLibAttribute Class
Indicates that the types defined within an assembly were originally defined in a type library.
Assembly: mscorlib (in mscorlib.dll)
You can apply this attribute to assemblies, although the Type Library Importer (Tlbimp.exe) typically applies it for you when it a type library.
The primary use of the attribute is to capture the original source of the type information. For example, you can import A.tlb as an interop assembly called A.dll and have assembly B.dll reference A.dll. When you export B.dll to B.tlb, this attribute causes the references in B.tlb that point to A.dll to point instead to A.tlb. This should not be confused with the ComImportAttribute, which specifies that an individual type is implemented in COM.
Imports System 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 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
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.