using System;

using System.Text.Json;         

using System.Collections.Generic;

using System.Linq.Expressions;

​

public class Program

{

​

    private static void Main() {

        Test(x => x.Test);      

    }

    private static void Test(Expression<Func<TestClass, string>> func) {

        var thing = new TestClass() {

            Test = "tesasdasdt"

        };

        Console.WriteLine(func.Parameters);

    }

}

public class TestClass 

{

    public string Test { get; set; }    

}

​