TypeLibVersionAttribute Class
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TypeLibVersionAttribute Class


Specifies the version number of an exported type library.

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


[AttributeUsageAttribute(AttributeTargets.Assembly, Inherited = false)]
public sealed class TypeLibVersionAttribute : Attribute

System_CAPS_pubmethodTypeLibVersionAttribute(Int32, Int32)

Initializes a new instance of the TypeLibVersionAttribute class with the major and minor version numbers of the type library.


Gets the major version number of the type library.


Gets the minor version number of the type library.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

You can apply this attribute to assemblies.

By default, the Tlbexp.exe (Type Library Exporter) generates a type library version from the first two numbers of an assembly version. For example, Tlb.exe exports assembly version 1.2.5000.0 as a type library version 1.2, eliminating the build and revision numbers of the assembly. If this behavior is undesirable, you can control the generation of the type library number explicitly by applying the TypeLibVersionAttribute.

It is useful to control the generation of a type library version explicitly when two assembly versions produce the same type library version. For example, assembly version and assembly version 1.2.500.0 both produce a type library version of 1.2, which can cause problems when you uninstall one of the assemblies. To differentiate the type library versions, you can force the second assembly (version 1.2.500.0) to produce a type library version of 1.25.

Legacy Code Example

The following example shows how to apply the TypeLibVersionAttribute to explicitly set the type library version to 1.25.

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

[assembly: AssemblyVersion("1.2.500.0")]
[assembly: TypeLibVersion(1,25)]
namespace MyNamespace
    public class TheClass
        // Insert code.

.NET Framework
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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