Indicates whether a program element is compliant with the Common Language Specification (CLS). This class cannot be inherited.
Assembly: mscorlib (in mscorlib.dll)
You can apply the 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, is ignored when applied to parameter or return value program elements.
If no 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 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.
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.
The following example applies a 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 , no compiler warning or error is generated.
[CLSCompliant(false)] public int SetValue(UInt32 value);
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, Xbox 360, Zune
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.