using System;

using System.Linq.Expressions;

using FluentAssertions;

​

public static class MyExpressions

{

    public static string NameOfProperty<T>(Expression<Func<T>> expression)

    {

        // Validate argument.

        _ = expression ?? throw new ArgumentNullException(nameof(expression));

        if (expression.Body.NodeType != ExpressionType.MemberAccess)

        {

            throw new ArgumentException("The expression must be a member access expression", nameof(expression));

        }

​

        // Now that we know we have a member expression in the body

        // we can cast it, get a reference to the MemberInfo

        // and return the property name.

        var memberExpression = (MemberExpression)expression.Body;

        return memberExpression.Member.Name;

    }

}

​

public class MyClass

{

    public string SomeProperty { get; set; } = "Some Value";

    public static void Main()

    {

        var obj = new MyClass();

        var propertyName = MyExpressions.NameOfProperty( () => obj.SomeProperty );

        propertyName.Should().Be(nameof(MyClass.SomeProperty));

        Console.WriteLine("The name of the property is: {0}", propertyName);

    }

}