Dump expression tree lambda into assembly for easy IL inspection using ildasm

ExpressionTreeLambdaToAssembly.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using System.Linq.Expressions;
using System.Reflection.Emit;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        public Program program;

        static void Main(string[] args)
        {
            var obj = Expression.Parameter(typeof(object), "instance");
            var typedObj = Expression.Convert(obj, typeof(Program));
            var getter = Expression.PropertyOrField(typedObj, "program");
            var upcasted = Expression.Convert(getter, typeof(object));
            var lam = Expression.Lambda<Func<object, object>>(upcasted, obj);
            var func = lam.Compile();
            Console.WriteLine(lam.ToString());

            SaveExpressionTreeToAssembly(lam, "get", "this", "this.dll");
        }

        public static void SaveExpressionTreeToAssembly(LambdaExpression lambda, string methodName, string assemblyName, string assemblyPath)
        {
            var dynamicAssembly = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName(assemblyName), AssemblyBuilderAccess.Save);
            var dynamicModule = dynamicAssembly.DefineDynamicModule(assemblyName + "_module", assemblyName + ".dll");
            var dynamicType = dynamicModule.DefineType(assemblyName + "_type");

            lambda.CompileToMethod(dynamicType.DefineMethod(methodName, MethodAttributes.Public | MethodAttributes.Static));
            dynamicType.CreateType();
            dynamicAssembly.Save(assemblyPath);
        }
    }
}