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Compiler Warning (level 2) CS3021 

Error Message

'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 (i.e., 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 Writing CLS-Compliant Code.

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()
    {
    }
}

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