using System;

using System.Linq.Expressions;

using System.Collections;

using System.Collections.Generic;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("***************** Setter Output **************************\n\n");

        var setterNameProperty = ExpressionUtils.CreateSetter<Employee, string>("Name");

        var setterBirthDateProperty = ExpressionUtils.CreateSetter<Employee, DateTime>("BirthDate");

​

        Employee emp = new Employee();

​

        setterNameProperty(emp, "John");

        setterBirthDateProperty(emp, new DateTime(1990, 6, 5));

​

        Console.WriteLine("Name: {0}, DOB: {1}", emp.Name, emp.BirthDate);

​

        Console.WriteLine("\n\n***************** Getter Output **************************\n\n");

        var getterNameProperty = ExpressionUtils.CreateGetter<Employee, string>("Name");

        var getterBirthDateProperty = ExpressionUtils.CreateGetter<Employee, DateTime>("BirthDate");

        Employee emp1 = new Employee()

        {

            Name = "John",

            BirthDate = new DateTime(1990, 6, 5)

        };

        var name = getterNameProperty(emp1);

        var birthDate = getterBirthDateProperty(emp1);

        Console.WriteLine("Name: {0}, DOB: {1}", name, birthDate);  

    }

}

​

public class Employee

{

    public string Name { get; set; }

    public DateTime BirthDate { get; set; }

}

​

public static class ExpressionUtils

{

    public static Action<TEntity, TProperty> CreateSetter<TEntity, TProperty>(string name) where TEntity: class

    {

        PropertyInfo propertyInfo = typeof(TEntity).GetProperty(name);

​

        ParameterExpression instance = Expression.Parameter(typeof(TEntity), "instance");

        ParameterExpression propertyValue = Expression.Parameter(typeof(TProperty), "propertyValue");

​

        var body = Expression.Assign(Expression.Property(instance, name), propertyValue);

​

        return Expression.Lambda<Action<TEntity, TProperty>>(body, instance, propertyValue).Compile();

    }

​

    public static Func<TEntity, TProperty> CreateGetter<TEntity, TProperty>(string name) where TEntity: class

    {

        ParameterExpression instance = Expression.Parameter(typeof(TEntity), "instance");

​

        var body = Expression.Property(instance, name);

​

        return Expression.Lambda<Func<TEntity, TProperty>>(body, instance).Compile();

    }

}