System.Linq.Expressions.BinaryExpression.Update C# (CSharp) Method

        public BinaryExpression Update(Expression left, LambdaExpression conversion, Expression right)
        {
            if (left == Left && right == Right && conversion == Conversion)
            {
                return this;
            }
            if (IsReferenceComparison)
            {
                if (NodeType == ExpressionType.Equal)
                {
                    return Expression.ReferenceEqual(left, right);
                }
                else
                {
                    return Expression.ReferenceNotEqual(left, right);
                }
            }
            return Expression.MakeBinary(NodeType, left, right, IsLiftedToNull, Method, conversion);
        }

        protected override ExpressionTree VisitBinary(BinaryExpression node)
        {
            BinaryExpression expression;

            if (node.Conversion != null)
            {
                CheckChildrenCount(3);

                var l = ExtractChildExpression(0);
                var r = ExtractChildExpression(1);
                var c = (LambdaExpression)ExtractChildExpression(2);

                expression = node.Update(l, c, r);
            }
            else
            {
                CheckChildrenCount(2);

                var l = ExtractChildExpression(0);
                var r = ExtractChildExpression(1);

                expression = node.Update(l, conversion: null, r);
            }

            return(CreateExpressionTree(expression));
        }