CLSCompliantAttribute Class (System)

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.NET Framework Class Library

CLSCompliantAttribute Class

Indicates whether a program element is compliant with the Common Language Specification (CLS). This class cannot be inherited.

Inheritance Hierarchy

System.Object
System.Attribute
System.CLSCompliantAttribute

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

Syntax

Visual Basic

<SerializableAttribute> _
<AttributeUsageAttribute(AttributeTargets.All, Inherited := True, AllowMultiple := False)> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class CLSCompliantAttribute _
	Inherits Attribute

[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets.All, Inherited = true, AllowMultiple = false)]
[ComVisibleAttribute(true)]
public sealed class CLSCompliantAttribute : Attribute

Visual C++

[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets::All, Inherited = true, AllowMultiple = false)]
[ComVisibleAttribute(true)]
public ref class CLSCompliantAttribute sealed : public Attribute

[<Sealed>]
[<SerializableAttribute>]
[<AttributeUsageAttribute(AttributeTargets.All, Inherited = true, AllowMultiple = false)>]
[<ComVisibleAttribute(true)>]
type CLSCompliantAttribute =  
    class
        inherit Attribute
    end

The CLSCompliantAttribute type exposes the following members.

Constructors

	Name	Description
	CLSCompliantAttribute	Initializes an instance of the CLSCompliantAttribute class with a Boolean value indicating whether the indicated program element is CLS-compliant.

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Properties

	Name	Description
	IsCompliant	Gets the Boolean value indicating whether the indicated program element is CLS-compliant.
	TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsDefaultAttribute	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
	_Attribute.GetTypeInfo	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
	_Attribute.Invoke	Provides access to properties and methods exposed by an object. (Inherited from Attribute.)

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Remarks

You can apply the CLSCompliantAttribute attribute to the following program elements: assembly, module, class, struct, enum, constructor, method, property, field, event, interface, delegate, parameter, and return value. However, the notion of CLS compliance is only meaningful for assemblies, modules, types, and members of types, not parts of a member signature. Consequently, CLSCompliantAttribute is ignored when applied to parameter or return value program elements.

If no CLSCompliantAttribute is applied to a program element, then by default:

The assembly is not CLS-compliant.
The type is CLS-compliant only if its enclosing type or assembly is CLS-compliant.
The member of a type is CLS-compliant only if the type is CLS-compliant.

If an assembly is marked as CLS-compliant, any publicly exposed type in the assembly that is not CLS-compliant must be marked with CLSCompliantAttribute using a false argument. Similarly, if a class is marked as CLS-compliant, you must individually mark all members that are not CLS-compliant. All non-compliant members must provide corresponding CLS-compliant alternatives.

Attributes that are applied to assemblies or modules must occur after the C# using (Imports in Visual Basic) clauses and before the code.

For more information about using attributes, see Extending Metadata Using Attributes.

Note
The current Microsoft Visual Basic compiler intentionally does not generate a CLS-compliance warning, however, a future release of the compiler will issue that warning.

Examples

The following example applies a CLSCompliantAttribute to the entire assembly.

using System;
    [assembly: CLSCompliant(true)]

The following declaration generates a CLS-compliance warning because the type UInt32 is not specified in the CLS.

 public int SetValue(UInt32 value);

If the declaration is marked with a CLSCompliantAttribute, no compiler warning or error is generated.

[CLSCompliant(false)]
 public int SetValue(UInt32 value);

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety

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

Reference

System Namespace

Attribute

Other Resources

Common Language Specification

Extending Metadata Using Attributes