ServerHasDefault.cs

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using System;
 
namespace AnalyzeRe.Attributes
{
    [AttributeUsage(AttributeTargets.Property)]
    public class ServerHasDefault : Attribute
    {
        private readonly object _knownDefault;
        private readonly bool _hasKnownDefault;
 
        public virtual bool HasKnownDefault => HasDefaultValue(null);
 
        public virtual object DefaultValue
        {
            get
            {
                if (!HasKnownDefault)
                    throw new NotSupportedException(
                        "This attribute has no known default value that applies to all objects.");
                return GetDefaultValue(null);
            }
        }
 
        public ServerHasDefault() { }
 
        public ServerHasDefault(object defaultValue)
        {
            _knownDefault = defaultValue;
            _hasKnownDefault = true;
        }
 
        protected ServerHasDefault(bool hasKnownDefault)
        {
            _hasKnownDefault = hasKnownDefault;
        }
 
        public virtual bool HasDefaultValue(object owner)
        {
            return _hasKnownDefault;
        }
 
        public virtual object GetDefaultValue(object owner)
        {
            if (!HasDefaultValue(owner))
                throw new NotSupportedException("This attribute has no known default value.");
            return _knownDefault;
        }
    }
}