using System;

using System.Diagnostics;

using System.Linq.Expressions;

using System.Reflection;

​

public class Program

{

    class TestObject

    {

        public double X

        {

            get;

            set;

        }

    }

​

    static MethodInfo GetSetterForX(Expression<Func<double>> expression)

    {

        var body = expression.Body;

        var operand = body as MemberExpression;

        var propertyInfo = (PropertyInfo)(operand.Member);

        var setter = propertyInfo.GetSetMethod(true);

        return setter;

    }

​

    public static void Main()

    {

        var testObject = new TestObject();

        var setter = GetSetterForX(() => testObject.X);

        setter.Invoke(testObject, new object[]{5});

        //Debug.Assert(testObject.X == 5);

        bool res = testObject.X == 5;

        Console.WriteLine(res);

    }

}