using System;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {

        Expression<Func<string, string>> spencyString =

            s => s + " belongs to Spencer";

​

        var toUpperVisitor = new ToUpperVisitor();

        var expressed = toUpperVisitor.VisitAndConvert(spencyString, null);

        var result = expressed.Compile().DynamicInvoke("the cheese");

        Console.WriteLine(result);

    }

​

    // Define other methods and classes here

    public class ToUpperVisitor : ExpressionVisitor

    {

        public override Expression Visit(Expression node)

        {

            if (node.NodeType == ExpressionType.Parameter)

            {

                return base.Visit(node);

            }

​

            if (node.Type == typeof(string))

            {

                var toUpper = typeof(string).GetMethod("ToUpper", Type.EmptyTypes);

                var methodCallExpression = Expression.Call(

                    node,

                    toUpper

                );

                return methodCallExpression;

            }

            return base.Visit(node);

        }

    }

}