SecurityAttribute.cs

using System.Runtime.InteropServices;

namespace System.Security.Permissions
{
    [Serializable]
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    [ComVisible(true)]
    public abstract class SecurityAttribute : Attribute
    {
        internal SecurityAction m_action;

        internal bool m_unrestricted;

        public SecurityAction Action
        {
            get
            {
                return m_action;
            }
            set
            {
                m_action = value;
            }
        }

        public bool Unrestricted
        {
            get
            {
                return m_unrestricted;
            }
            set
            {
                m_unrestricted = value;
            }
        }

        protected SecurityAttribute(SecurityAction action)
        {
            m_action = action;
        }

        public abstract IPermission CreatePermission();

        [SecurityCritical]
        internal static IntPtr FindSecurityAttributeTypeHandle(string typeName)
        {
            PermissionSet.s_fullTrust.Assert();
            Type type = Type.GetType(typeName, throwOnError: false, ignoreCase: false);
            if (type == null)
            {
                return IntPtr.Zero;
            }
            return type.TypeHandle.Value;
        }
    }
}