using System;

using System.Linq.Expressions;

​

public class Program

{

        public class T

        {

            public float f;

            public bool b;

​

​

        }

        public static void Main(string[] args)

        {

            T t = new T();

            Action<T, float> action = MakeAssignment<T, float>("f");

            var setBool = MakeAssignment<T, bool>("b");

            Console.WriteLine(t.b);

            setBool(t, true);

            Console.WriteLine(t.b);

​

            Console.WriteLine(t.f);

            action(t, 1.0f);

            Console.WriteLine(t.f);

        }

​

        public static Action<T, TField> MakeAssignment<T, TField>(string fieldName)

        {

            var type = typeof(T);

            var typeField = typeof(TField);

            var fieldF = type.GetField(fieldName);

            var targetExp = Expression.Parameter(type);

            var valueExp = Expression.Parameter(typeField);

            var l = Expression.Lambda<Action<T, TField>>(Expression.Assign(Expression.Field(targetExp, fieldF), valueExp), targetExp, valueExp);

            return l.Compile();

        }

}