// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
using System.Reflection;
using System.Collections.Generic;
 
namespace System.Runtime.CompilerServices
{
    [Serializable]
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter, Inherited=false)]
    [System.Runtime.InteropServices.ComVisible(true)]
    public abstract class CustomConstantAttribute : Attribute
    {
        public abstract Object Value { get; }
 
        internal static object GetRawConstant(CustomAttributeData attr)
        {
            foreach (CustomAttributeNamedArgument namedArgument in attr.NamedArguments)
            {
                if (namedArgument.MemberInfo.Name.Equals("Value"))
                    return namedArgument.TypedValue.Value;
            }
 
            // Return DBNull to indicate that no default value is available.
            // Not to be confused with a null return which indicates a null default value.
            return DBNull.Value;
        }
    }
}