System.Linq.Expressions.Expression.Not C# (CSharp) Method

        public static UnaryExpression Not(Expression expression)
        {
            return Not(expression, method: null);
        }

        protected override object VisitIf(If I)
        {
            string name = target.LabelName();

            LinqExprs.LabelTarget _else = LinqExpr.Label("if_" + name + "_else");
            LinqExprs.LabelTarget end   = LinqExpr.Label("if_" + name + "_end");

            // Check the condition, exit if necessary.
            target.Add(LinqExpr.IfThen(LinqExpr.Not(target.Compile(I.Condition)), LinqExpr.Goto(_else)));

            // Execute true code.
            target.PushScope();
            Visit(I.True);
            target.PopScope();
            target.Add(LinqExpr.Goto(end));

            // Execute false code.
            target.Add(LinqExpr.Label(_else));
            target.PushScope();
            Visit(I.False);
            target.PopScope();

            // Exit point.
            target.Add(LinqExpr.Label(end));
            return(null);
        }