protected virtual Expression VisitIsNull(IsNullExpression isnull)
{
Expression expr = this.Visit(isnull.Expression);
if (expr != isnull.Expression)
{
return(new IsNullExpression(expr));
}
return(isnull);
}
protected virtual bool CompareIsNull(IsNullExpression a, IsNullExpression b)
{
return(Compare(a.Expression, b.Expression));
}