GetTypeLibGuidForAssembly Method
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Marshal.GetTypeLibGuidForAssembly Method (Assembly)


Retrieves the library identifier (LIBID) that is assigned to a type library when it was exported from the specified assembly.

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public static Guid GetTypeLibGuidForAssembly(
	Assembly asm


Type: System.Reflection.Assembly

The assembly from which the type library was exported.

Return Value

Type: System.Guid

The LIBID that is assigned to a type library when it is exported from the specified assembly.

Exception Condition

asm is null.

When assemblies are exported to type libraries, the type library is assigned a LIBID. You can set the LIBID explicitly by applying the System.Runtime.InteropServices.GuidAttribute at the assembly level, or it can be generated automatically. The Tlbimp.exe (Type Library Importer) tool calculates a LIBID value based on the identity of the assembly. GetTypeLibGuid returns the LIBID that is associated with the GuidAttribute, if the attribute is applied. Otherwise, GetTypeLibGuidForAssembly returns the calculated value. Alternatively, you can use the GetTypeLibGuid method to extract the actual LIBID from an existing type library.

See the Exported Assembly Conversion topic for more information about library identifiers.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

.NET Framework
Available since 1.1
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