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;

int factor = 3;
Expression<Func<int>> captured = () => factor * 2;
var read = captured.Compile(preferInterpretation: true);
Expression<Func<int, int>> parameterized = value => value * 2;
var apply = parameterized.Compile(preferInterpretation: true);
Console.WriteLine($"before:{read()}");
factor = 5;
Console.WriteLine($"after:{read()}");
Console.WriteLine($"input:{apply(3)}");
Console.WriteLine($"capture:{((BinaryExpression)captured.Body).Left.NodeType}");