CLSCompliantAttribute Class

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

CLSCompliantAttribute.cs

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

public ref class CLSCompliantAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.All, AllowMultiple=false, Inherited=true)]
public sealed class CLSCompliantAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.All, AllowMultiple=false, Inherited=true)>]
type CLSCompliantAttribute = class
    inherit Attribute

Public NotInheritable Class CLSCompliantAttribute
Inherits Attribute

Inheritance

Object

Attribute

CLSCompliantAttribute

Attributes

AttributeUsageAttribute

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);

Remarks

The CLSCompliantAttribute attribute is used to indicate whether a particular program element complies with the Common Language Specification (CLS), which defines the features that any language that targets .NET must support. CLS compliance is primarily of concern to library developers who want to ensure that their libraries are accessible in any language that targets .NET. For more information, See Language Independence and Language-Independent Components.

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 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.

Constructors

CLSCompliantAttribute(Boolean)

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

Properties

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)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
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(Object)	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)

See also

• Attribute
• Language Independence and Language-Independent Components
• Extending Metadata Using Attributes