using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Reflection;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;

Expression<Func<int, int>> tree = value => value * 2 + 1;
Func<int, int> direct = value => value * 2 + 1;
var body = (BinaryExpression)tree.Body;
Console.WriteLine($"node:{body.NodeType}");
Console.WriteLine($"left:{body.Left.NodeType}");
Console.WriteLine($"interpreted:{tree.Compile(preferInterpretation: true)(3)}");
Console.WriteLine($"delegate:{direct(3)}");