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Compiler Warning (level 2) CS3021

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'type' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute

This warning occurs if [CLSCompliant(false)] appears on a class in an assembly which does not have an assembly-level CLSCompliant attribute set to true (that is, the line [assembly: CLSCompliant(true)]). Since the assembly is not declaring itself CLS compliant, there is no need for anything within the assembly to declare itself non-compliant, since it is assumed to be non-compliant. For more information on CLS compliance, see Language independence and language-independent components.

To get rid of this warning, remove the attribute or add the assembly level attribute.

Example

The following example generates CS3021:

// CS3021.cs  
using System;  
// Uncomment the following line to declare the assembly CLS Compliant,  
// and avoid the warning without removing the attribute on the class.  
//[assembly: CLSCompliant(true)]  
  
// Remove the next line to avoid the warning.  
[CLSCompliant(false)]               // CS3021  
public class C  
{  
    public static void Main()  
    {  
    }  
}

See also