public override IPermission Intersect(IPermission target)
{
SecurityPermission sp = Cast(target);
if (sp == null)
{
return(null);
}
if (IsEmpty() || sp.IsEmpty())
{
return(null);
}
if (this.IsUnrestricted() && sp.IsUnrestricted())
{
return(new SecurityPermission(PermissionState.Unrestricted));
}
if (this.IsUnrestricted())
{
return(sp.Copy());
}
if (sp.IsUnrestricted())
{
return(this.Copy());
}
SecurityPermissionFlag f = flags & sp.flags;
if (f == SecurityPermissionFlag.NoFlags)
{
return(null);
}
else
{
return(new SecurityPermission(f));
}
}