Expression based property setters

ExprGetter.cs

using BenchmarkDotNet.Attributes;
using System.Linq.Expressions;

BenchmarkDotNet.Running.BenchmarkRunner.Run<Runner>();

public class Runner
{
    Person p = new Person() {  Name = "Pankaj" };
    [Benchmark]
    public void SetUsingReflection()
    {
        p.SetUsingReflection(10);
    }
    [Benchmark]
    public void SetUsingExpression()
    {
        p.SetUsingExpression(20);
    }
    [Benchmark]
    public void SetUsingCompiledExpression()
    {
        p.SetUsingCompiledExpression(30);
    }
}

public static class PersonExtensions
{
    public static bool SetUsingReflection(this Person p, int number)
    {
        var pinfo = typeof(Person).GetProperty("Age", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
        if (pinfo == null) return false;
        pinfo.SetValue(p, number);
        return true;

    }

    public static bool SetUsingExpression(this Person p, int number)
    {
        var expr1 = Expression.Parameter(typeof(Person));
        var expr2 = Expression.Parameter(typeof(int));
        var propertyGetterExpr = Expression.Property(expr1, "Age");

        var lambda = Expression.Lambda<Action<Person, int>>(Expression.Assign(propertyGetterExpr, expr2), expr1, expr2);

        var compiled = lambda.Compile();
        //Console.WriteLine(lambda.ToString());
        compiled(p, number);
        return true;

    }

    static readonly Action<Person, int> SetterFunction;
    static PersonExtensions() {
       
        var expr1 = Expression.Parameter(typeof(Person));
        var expr2 = Expression.Parameter(typeof(int));
        var propertyGetterExpr = Expression.Property(expr1, "Age");

        var lambda = Expression.Lambda<Action<Person, int>>(Expression.Assign(propertyGetterExpr, expr2), expr1, expr2);

        SetterFunction = lambda.Compile();
    }

    public static bool SetUsingCompiledExpression(this Person p, int number)
    {
        SetterFunction(p, number);
        return true;
    }
}


public class Person
{
    private int Age { get; set; }

    public string Name { get; set; }

    public override string ToString()
    {
        return $"{Name} is of {Age} years";
    }
}